💬 Water Meter Pulse Sensor

dpcr

I hope this is not off topic but I'm trying to read our gas meter - but....I cannot use a photo sensor or a hall sensor or a reed switch (the meter is outside and there is no magnet in it). I was able to get some good data using a magnetometer (https://www.sparkfun.com/tutorials/301) using an arduino. But I tink from what I am told is the arduino isn't big enough to handle the code I need to use to change the data (x axis, y axis, z axis) into a pulse but will work on a pi.

My question is am I missing something (hardware guy, not software)? Can I use a Pi for a sensor (it has the inputs and room), all the code on this site is for arduinos. Could I have the Pi output a pulse to an arduino? Am I over thinking this?

bart59

@dpcreel. I would be surprised the Arduino could not handle the HMC5883L magnetometer from Sparkfun. The I2C protocol is natively supported and you only need to analyse numbers coming from the 3-Axis to decide when the wheels inside the gas meter turn. I think the position of the sensor will be very critical, but the code should not be too complex. Arduino's are typically limited in handling much data (there is only 2000 bytes of RAM in the ATmega328), but your code should not need much RAM space. The program size can be 32 KB which should be enough.

If you want to go for the PI, there are I2C libraries out there you could use and I would then bypass the Mysensors gateway alltogether and connect an ethernet cable to the PI and use the MQTT protocol to talk to your home controller.

regards
Bart

dpcr

@bart59 The Arduino works fine with the HMC5883L, I got some good data from it and was able to "see" the gas meter movements very well. I am not able to write code (hardware guy) to change this data to a pulse for MySensors or whatever it needs. I just want to be able to read my gas meter with the HMC5883L. I did find some code in python that works on the pi, that's why I mentioned it. I'm a hack at software.

aram

Hi
I am trying to use the subject code with pulse water meters and hope someone can help to figure out what needs to be adjusted to get more accurate data.

My setup:
Gateway ESP8266 (NodeMCU) + NRF24 -> Connected to Domoticz
Sensor node: Arduino Uno + NRF24
Default codes from Build. Test sensors so far work great.

Task:
Need to connect Siemens WFK2 water meters (four of them actually) with pulse outputs (2 line). According to data sheet (link text) there are two types: reed output or NAMUR.

To start with, I connected the reed output of the water meter via 10k resistor to +5V, GND and D3. Again, according to data sheet, for every 10l the water meter should give an impulse (e.g. connect the switch). Taking this into account I have adjusted pulse factor to 100 and based on Nominal Flow Rate (Max Flow Rate impossible in my case) limited Max Flow to 25 l/min. This setup works, but I definitely get wrong flow values (e.g. with constant flow of 6l/min serial monitor and domoticz report anything between 12-15l/min) and also wrong water usage m3 and litre usage in Domoticz.

When trying to debug, found out following behaviour (must be connected to Pulse length an Qn from data sheet IMHO):
with each turn it indeed switches on, e.g. shortens the contacts which generates pulse for the sensor, however it takes up to 2-4 litres until switch is in the off state.

As a result you might have a situation when meter switches on, one closes the tap, and the signal is on for minutes/hours until tap is again opened and 2-4 litres have been used, after which signal will switch off.

Do I understand correctly that the debouncer which should take care of similar situations is not ready for this?

thanks in advance for support

bart59

Hi Aram

The original code from the mysensors site does not handle your situation very well (indeed because the switch staying on or off for a long time). You can use my code (see my post further up this discussion). In my case I have a pulse every 1 liter.

In your case you only have 1 pulse every 10 liters, which means you have to take a much longer period to calculate the flow correctly. Basically you have to set MIN_SEND_FREQ to a higher value. The flow is calculated based on the number of pulses in a given time period. Example: with 6 l/min you have to calculate this value only once every 5 minutes (=30 liter = 3 pulses from your Siemens meter) instead of every 30 seconds as I do. So if MIN_SEND_FREQ = 600 (every 5 minutes) your flow is calculated as:

flow = ((double) (pulseCount-oldPulseCount)) * (60000.0 / ((double) intervalcnt*(double) CHECK_FREQUENCY)) / ppl;

In the example above (pulseCount-oldPulseCount) = 3 pulses
ppl = 0.1
intervalcnt = MIN_SEND_FREQ = 600
CHECK_FREQUENCY = 500
==> flow is 6 l/min

regards

Bart

aram

bart59,

thanks for quick reply. I will try to adjust MIN_SEND_FREQ and use your code.
however, if I understand correctly, with the current logic used its impossible to avoid misinterpretations of pulses in case of very very long on or off state. It will approximate the flow rate to more correct value during usage of water (this is good enough) and should report total usage somehow correctly (this one I would better get as precise as possible). I wonder if the code will capture the correct number of pulses in the case of very long on state.

BTW, I was not able to find a readily available sketch to connect NAMUR output, which is basically 5kOhm off state and 1.5795 kOhm on state. I believe, I will have to calculate required pull up resistance to get a proper voltage divider for 5\3.3v, right?

bart59

My code basically measures the time between two upward pulses. You can modify the code to also count the downward pulses. The net effect is that you will get a count every 5 liter (on average), but if there is no flow, the first pulse will always be off by 1-4 liter because you do not know how far the rotation is completed.

On NAMUR: you can actually use my code here too: I use analog input A1 to measure the voltage on the infra red sensor (which varies between 0 and 1.1 Volt). During the learn mode (set with a seaprate DIP switch) the code measures the input voltage for a period of 30 seconds while you turn open the water tap (you may want to increase the timing in your case) and then calculates the average between the lowest and highest voltage as the currect point there is a 1 or 0 coming from the pump (in my case it is an IR LED that is reflecting from a mirror into a photo sensor and the position of the mirror may change - resulting in different voltages).

regards
Bart

Curtis Dobrowolski

Would anyone be able to help me get the hall sensor to work to work directly connected to an ESP8266 MQTT gateway? I was able to created the MQTT gateway, appended this sketch to the MQTT gateway sketch and connect the hall sensor DO to D12 (D3 is occupied), but when I subscribe to my mosquitto server no values are published. I am able to see the prefixes and they get published every 20 seconds as expected, but there are no sensor values. I plan on using this with home assistant, incase that helps with the final setup. If anyone has any recommendations it would be greatly appreciated.

jagadesh waran

Can you please roughly say

what is the current consumption overall
what is the current consumption when measuring a pulse
what is the current consumed when the data is transmitted

mfalkvidd

@jagadesh-waran welcome to the MySensors community.

The current consumption depends on which Arduino you are using and which radio you are using.

Could you describe what your goal is?

Maybe the page on battery power can be useful.

jagadesh waran

@mfalkvidd im using mini at 8mhz with a 3V battery, No LDO and an ESP8266

I want to calculate the battery life say im using 3V 19000mah battery and if im consuming 100 gallons per day

Could you please update me the life of the battery?

Could you please update me the current consumptions at various intervals?

mfalkvidd

@jagadesh-waran The easiest ways is to either measure the consumption on your devices, or look at the datasheets.

webzter30

I am trying this node. I have it set up. but I am having the same problem as Dirtbag. I am not getting any values. I debugged and I am getting 1 and 0 for my sensor output, so my sensor is working when I trigger it with a magnet.
Does this work with MQTT gateway?? am I missing something. Communication is fine between by ESP gateway and my node.?
Thanks ahead of time for any help with this.

mrc-core

Hi. i'm having a strange problem using a arduino nano connecting a hall sensor to read my water meter. My water meter is dated from 1996 and i can't use the TCRT5000 sensor so i'm trying my luck with the hall sensor. My problem is that my arduino is always sending data.... even if i have the water turned off the most strange thing is that even when the arduino is not connected to the hall sensor it send's data. How can i fix this problem ?

mfalkvidd

@mrc-core did you read this part of the instructions?

You can also set the frequency that the sensor will report the water consumption by updating the SEND_FREQUENCY. The default frequency 3 times per minute (every 20 seconds).

mrc-core

@mfalkvidd Yes i did but has you can see even when the hall sensor is not connected the arduino sends data and the water increases in the the gateway. I can work on the SEND_FREQUENCY and see if it fix this problem.

Thnaks for the replay

mrc-core

Have been working with the code and have found one strange thing. When my sensor sends data to the gateway "domoticz" the gateway sends a value to the sensor. The strange thing is that my arduino does not have any sensor connected and sow the data send is zero but my gateway sends akways a positive value and increases this value every time it sends data to the arduino.

Even if i go to the arduino code and set the volume and pulseCount to 0 flash it to the arduino, load the value of zero to the gateway and then e flash the same code but this time i remove the volume and pulseCount to 0 the first time the arduino sends data to the gateway it always receive a value insted of zero since i dont have the hall sensor connected to the arduino.

I'm using a arduino mini pro 3.3v on a easy pcb by soundberg81 and i have setup the digital pin2 to connect the hall sensor.

Here's some log from my arduino:

0 MCO:BGN:INIT NODE,CP=RNNNA--,VER=2.1.1
3 TSM:INIT
4 TSF:WUR:MS=0
11 TSM:INIT:TSP OK
13 TSF:SID:OK,ID=1
14 TSM:FPAR
51 TSF:MSG:SEND,1-1-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
1032 TSF:MSG:READ,0-0-1,s=255,c=3,t=8,pt=1,l=1,sg=0:0
1037 TSF:MSG:FPAR OK,ID=0,D=1
2058 TSM:FPAR:OK
2059 TSM:ID
2060 TSM:ID:OK
2062 TSM:UPL
2065 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2172 TSF:MSG:READ,0-0-1,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2178 TSF:MSG:PONG RECV,HP=1
2181 TSM:UPL:OK
2182 TSM:READY:ID=1,PAR=0,DIS=1
2187 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2320 TSF:MSG:READ,0-0-1,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2327 TSF:MSG:SEND,1-1-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.1.1
2335 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
3517 TSF:MSG:READ,0-0-1,s=255,c=3,t=6,pt=0,l=1,sg=0:M
3526 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=11,pt=0,l=11,sg=0,ft=0,st=OK:Water Meter
3535 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=12,pt=0,l=5,sg=0,ft=0,st=OK:2.4.B
3544 TSF:MSG:SEND,1-1-0-0,s=1,c=0,t=21,pt=0,l=11,sg=0,ft=0,st=OK:Hall Sensor
3551 MCO:REG:REQ
3589 !TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=NACK:2
5596 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=1,st=OK:2
5665 TSF:MSG:READ,0-0-1,s=255,c=3,t=27,pt=1,l=1,sg=0:1
5670 MCO:PIM:NODE REG=1
5673 MCO:BGN:STP
5677 TSF:MSG:SEND,1-1-0-0,s=1,c=2,t=25,pt=0,l=0,sg=0,ft=0,st=OK:
5683 MCO:BGN:INIT OK,TSP=1
6484 TSF:MSG:READ,0-0-1,s=1,c=2,t=25,pt=0,l=1,sg=0:0
Received last pulse count from gw:2
pulsecount:2
35686 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:2
volume:0.003
35694 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.003
l/min:2.05
65687 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:2.05
pulsecount:4
65695 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:4
volume:0.004
65704 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.004
l/min:0.00
95688 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:0.00
pulsecount:5
95696 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:5
volume:0.005
95706 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.005
pulsecount:5
125689 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:5
volume:0.006
125698 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.006
l/min:2.00
155691 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:2.00
pulsecount:7
155699 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:7
volume:0.007
155708 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.007
l/min:0.00
185691 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:0.00
pulsecount:8
185699 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:8
volume:0.008
185708 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.008
pulsecount:8
215696 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:8
volume:0.009
215707 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.009
l/min:2.00
245693 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:2.00
pulsecount:10
245701 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:10
volume:0.010
245710 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.010
l/min:0.00
275694 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:0.00
pulsecount:11
275702 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:11
volume:0.011
275714 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.011
pulsecount:11
305695 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:11
volume:0.012
305703 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.012
l/min:2.00
335698 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:2.00
pulsecount:13
335707 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=OK:13
volume:0.013
335718 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=OK:0.013
l/min:0.00
365732 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=OK:0.00
pulsecount:14
365776 !TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=0,st=NACK:14
volume:0.014
365788 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=1,st=OK:0.014
376929 TSF:MSG:READ,0-0-255,s=255,c=3,t=20,pt=0,l=0,sg=0:
376934 TSF:MSG:BC
377041 TSF:MSG:SEND,1-1-0-0,s=255,c=3,t=21,pt=1,l=1,sg=0,ft=0,st=OK:0
l/min:5.36
395735 !TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=34,pt=7,l=5,sg=0,ft=0,st=NACK:5.36
pulsecount:16

Again since i'm geting this problem i don't have my sensor connected to the arduino.

mfalkvidd

@mrc-core if nothing is connected to the sensor pin, the pin will float and might create spurious interrupts. Connect the pin to gnd to make sure it doesn't get any false triggers.

mrc-core

@mfalkvidd Thanks. Have now connected the digital pin2 to gnd and in the last 1h the values are always 0.000 going to leave it this way until night since now i'm at work. I would like to find out what was creating the spurious interrupts??
Other thing that ill find out tonight is when i connect the sensor to the arduino will it create rong data or will it only send real data only when the water meter starts running water...

One more thing today at 8:00 when i did the pin2 to gnd the first "boot" over domoticz i got this value as you can see on the image below. Is this normal? Have been trying to deleted but it wont go away.

Once again thanks for your help.

0_1497430047720_Water data.png

bart59

@mrc-core
The spurious interrups are caused by the open line. The Arduino has high impedance inputs and anything from a WiFi signal or the signal from a close by circuit can cause the value to swing between 0 and 3 Volt, triggering your input. See https://www.arduino.cc/en/Tutorial/DigitalPins

On your high value in the graph: Domoticz water sensors require the sensor to post the total water volume. This means that the sensor needs to "know" the total of volumes from all the past measurements. In fact all the (wrong) past pulses you generated with the open input are stored by the sensor. There are 2 ways this storage mechanism can be realized in Arduino code:

(1) keep the value in the Arduino EEPROM and
(2) use a build in feature of Domoticz to store values on behalf of sensors.

Mysesnsors uses method 2 as method (1) has 2 disadvantages: The code needs to continuously write to the EEPROM, because you never know when the Arduino will be rebooted. The EEPROM on the Arduino chip does not allow you to write to it that often (max 100,000 times or so) and the EEPROM is cleared when you update the software. The sketch used by MySensors uses method (2) by sending the pulsecount to the gateway using send(lastCounterMsg.set(pulseCount)) statement at the same time the volume is sent to Domoticz with send(volumeMsg.set(volume, 3)); At each reboot the sensor requests the value of VAR1 from the gateway using request(CHILD_ID, V_VAR1); The sensor does not send any data to the gateway until the gateway has received the counter past value. The receive() function is called by the Mysensor library when data comes back from the gateway. There the pulseCount += gwPulseCount statement adds the value to the pulseCount.

This means the sensor will not be able to "forget" the pulses that came from the period your digital input was not connected.

There are 3 ways to fix this problem:

you can delete your sensor at the Domoticz side (throwing away all history): First power down your Arduino sensor, the go into Domoticz screen and remove the sensor from the Utility screen and then remove the sensor from the Setup->Hardware->MysensorsGW->Setup->Click on your water meter-> delete all Children-> delete the water meter sensor itself. Then power up your Arduino and you will see the sensor show up again.
as above: remove your sensor from the Utilities tab and change the code to give your sensor another new ID. At the top of your code you can put a statement like

#define MY_NODE_ID 10

This will be the ID number that shows in the hardware setup screen in Domoticz for your sensor. If you omit this code MySensors will create a new (unique) code for you. However in my system I prefer to allocate the numbers myself to each sensor. So a quick way to create a brand new sensor history in Domoticz is to simply change the MY_NODE_ID number (change from 10 to 11).

change yuor Arduino code to force a 0 in the VAR1 holding variable for your sensor. You can do that by adding a statement send(lastCounterMsg.set(0)); inside your loop() function (best place is here):

// Only send values at a maximum frequency or woken up from sleep
   if (SLEEP_MODE || (currentTime - lastSend > SEND_FREQUENCY)) {
       lastSend=currentTime;

      send(lastCounterMsg.set(0));  // <--- keep here shortly and remove later

       if (!pcReceived) {
           //Last Pulsecount not yet received from controller, request it again
           request(CHILD_ID, V_VAR1);
           return;
       }

You will compile and upload this code to your Arduino and let it run for a minute or so, then remove the line and upload the orginal code. You should now be able to remove the data point in Domoticz (by using ctrl-mouseclick on the graphic item)

Hope this helps

Bart

mrc-core

@bart59 Thanks have done like you said and did clean the data from the gateway.
All day until 1h ago i had left my arduino connected on my pc and i did like mfalkvidd said connecting the digital pin 2 to gnd and my arduino did not send any strange value to the gateway always seend volume 0.00 this was perfect.
Now that i'm at home i had connect my arduino to the sensor 3.3v gnd and digital pin2 and in the first log there it was value increase on volume when my sensor was in front off me...

I have a arduino nano pro 3.3v on easy pcb board and i'm using the hall sensor i dont see why i'm getting this problem...
I have a WiFi AP inside home and my sensor is outside.

Even the water flow says i have a 2.00 L/min when the sensor is not near the water meter.

mrc-core

New update.... have change the arduino mini pro for another one flash a new code a new sensor and again i'm getting volume data when the sensor is not near the water meter. I dont understand what's happening.

bart59

@mrc-core Just to make sure: are you connecting/disconnecting the data pin to your sensor when the Arduino is powered off and are you sure the connection is solid? If you connect things with power on you may accidently trigger a pulse a 100 times.... which will be sent to the gateway 20 secs later. Always power off stuff first and use a solid connection (soldering is always better) when making modifications. How did you power the hall sensor? Should be from the 3.3V VCC connector of the Arduino and not from the higher voltage or something separate. Can you upload a photo of your setup to allow us to see how you connect things?

Bart

mfalkvidd

In addition to what bart59 said, make sure the hall sensor isn't near anything magnetic. It will be triggered by any magnetic material, not just the water meter.

mrc-core

@bart59 Yes i'm using the 3,3v from the arduino and i always connect everything with the arduino power off. Give me mor 5 minutes and i'll upload a photo from my sensor going to bring it inside home.
@mfalkvidd i think i don't have anything magnetic on the place were i'm putting the arduino and the sensor at this time.

Thanks for the replays.

mrc-core

Ok here's the photo off my sensor. On my code i'm using the digital pin2 since digital pin3 has a resistor for Dallas and dht sensors but i'm not using them at this time. This arduino is only for water meter.

mrc-core

I think i have fix my problem. I have been playing with the code and the sensor and notice that the power led and data led on the sensor were always on no mater the digital pin i was trying to use.
This also happened with the analog pin A0.
In one last attempt i decided to use the digital pin 3 with the resistor soldered on the board for sensors like dallas and dht11 or dht22.

Now the first thing i had noticed was the data led was not on and now it only comes on when i passe a magnet under my sensor... it does not count any pulsecount if i passe the magnet over the sensor only under it.

Counted the times i had passed the magnet under the sensor and my gateway received te exact number 30 times = 0.030 volume and now the volume is stop at this number no more ghost encrease numbers.

Tomorrow morning i'm going to mount the sensor over the water meter to see if this finaly works.

The only problem i'm getting now is some NACK over the transmissions... like this:
6604747 TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=3,st=OK:30
volume:0.030
604794 !TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=0,st=NACK:0.030
pulsecount:30
634781 !TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=25,pt=5,l=4,sg=0,ft=1,st=NACK:30
volume:0.030
634828 !TSF:MSG:SEND,1-1-0-0,s=1,c=1,t=35,pt=7,l=5,sg=0,ft=2,st=NACK:0.030

bart59

@mrc-core The NACK may be bad transmission. I typically connect a 5 cm piece of wire to the antenna of the send/receive module to increase the reception of data

mrc-core

@bart59 and @mfalkvidd Thanks for all the help. Today i toke the sensor to the water meter and for my luck my water meter is too old 1997 and no mater the position i put the hall sensor it just doesn't get any pulse at all at this time i really don't now what to use to get the data from my water meter...
I have already tried also the TCRT5000 and also does not work. Here's an image from my water meter
0_1497529305996_Sem Título.png

The TCRT5000 when i put over the glass the green led stays always on but when i remove it from the glass and point it to the black part of my meter the green led goes off the sensor is working ok but the glass from my meter does not help at all.

Any sugestions off other sensors i can try or use ?

bart59

@mrc-core You are right. This is the wrong type of water meter. I have been using 2 other brands watermeters: the Honeywell C7195x2001B (see http://ecc.emea.honeywell.com/downloads/EN2R9029.PDF) and the Caleffi series 316 (http://www.arbo.it/images/techsheets/316405.pdf). You local central heating installation guy may have them as they are used in boiler systems of central heating for the warm water supply. They are also sold on eBay. Both work more or less the same and can be operated on 5V. The number of pulses per liter are much higher (something like 500 pulses per liter), so they are more accurate. You will need to modify your code to work with this. Below the code of my sensor (which also measures multiple temperatures at the same Arduino chip):

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 * 
 * (c) 2017 Bart M - last edits: 15 May 2017
 * 
 * Note: using timer0 to generate a second interrupt for our 1 ms counters. timer0 is still also  used for delay()
 *
 * Functions WTW Flow and Temperature
 * 
 * WTW flow
 *  - Flow of shower cold water
 *  - Flow of boiler cold water entry
 *  
 * Temperature 
 * - Temperature of outgoing water (Dallas with cable)
 * - Temperature of shower head (Dallas)
 * 
 * Flow meter using Honeywell C7195A2001B which has a hall sensor that pulses at 7 Hz per liter/min
 * we count only upgoing pulses, so in our case we get: 
 *   7 pulses per second at 1 l/min
 *   420 pulses per liter
 *   420000 pulses per m3
 * Flow meter Caleffi 316 which has a hall sensor that pulses at 8.8 Hz per liter/min (according to specs)
 * In reality the frequency is about 30% lower in my case, so we have to correct this with a factor of 1.3.
 *   8.8 pulses per second at 1 l/min
 *   528 pulses per liter
 *   528000 pulses per m3
 *   528000/1.3 = 406154
 * 
 * If we use 250 m3 per year we come to 105 x 10^6 pulses/year
 *`this is stored in an unsigned long that can hold 4295 x 10^6 -> volume overflow after 41 years
 *
 *****************************************************************************************************  */

// BOARD: PRO MINI 5V V/ 16Mhz ATMEGA328 16Mhz

// type of flow meter
#define CALEFFI
// #define HONEYWELL

// Enable debug prints to serial monitor
#define MY_DEBUG 1

// Enable and select radio type attached
#define MY_RADIO_NRF24
// No repeater 

// node ID's
#define MY_NODE_ID 27             // start naming my own nodes at number (set in comments if you want automatic)
#define FLOW_ID 1                 // flow meter 1 (start here if more)
#define NFLOWS 2                  // number of flow meters  
#define TEMP_ID 3                 // Temperature (start here if there are more linked)

#include <SPI.h>
#include <MySensors.h>  
#include <DallasTemperature.h>
#include <OneWire.h>

// PIN connections where the flow meters are connected. We have 2 flow meters, so our array has 2 entries
uint8_t FlowPins[NFLOWS] = {2, 3};
#define TEMP_PIN 4                // temp sensor connected to pin4

#ifdef CALEFFI
// #define PULSE_FACTOR 528000        // Number of blinks per m3 of your meter Caleffi (from data sheet)
#define PULSE_FACTOR 406154        // Nummber of blinks per m3 of your meter Caleffi (measured in my installation)
#else
#define PULSE_FACTOR 420000        // Nummber of blinks per m3 of your meter Honeywell
#endif

// configs
#define MAXFLOWERROR 50             // maximum number of l/min that we accept

// delay times
#define CHECK_FREQUENCY 1000         // time in milliseconds between loop (where we check the sensor) - 1000ms
#define MIN_SEND_FREQ 10             // Minimum time between send (in multiplies of CHECK_FREQUENCY). We don't want to spam the gateway (10 seconds)
#define MIN_FLOW_SEND_FREQ 20        // Minimum time between send (in multiplies of CHECK_FREQUENCY). We don't want to spam the gateway (30 seconds)
#define MAX_SEND_FREQ 600            // Maximum time between send (in multiplies of CHECK_FREQUENCY). We need to show we are alive (600 sec/10 min)

// one wire config
#define ONE_WIRE_BUS TEMP_PIN
#define MAX_ATTACHED_DS18B20 8

// Motion message types
MyMessage volumeMsg(FLOW_ID,V_VOLUME);
MyMessage flowMsg(FLOW_ID,V_FLOW);
MyMessage lastCounterMsg(FLOW_ID,V_VAR1);
MyMessage tempmsg(TEMP_ID, V_TEMP);

OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
DallasTemperature sensors(&oneWire); // Pass the oneWire reference to Dallas Temperature. 
float lastTemperature[MAX_ATTACHED_DS18B20];
volatile unsigned int numSensors = 0;

double ppl = ((double)PULSE_FACTOR / 1000.0);    // Pulses per liter
boolean pcReceived[NFLOWS];                      // received volume from prior reboot
double oldflow[NFLOWS];                          // keep prior flow (only send on change)
unsigned long oldflow_cnt[NFLOWS];               // only send when changed


// updated in ISR
volatile unsigned int mcnt = CHECK_FREQUENCY;   // decremented in ISR at 1000Hz. Cycles at one per second to update send counters
volatile unsigned int tempsendcnt[MAX_ATTACHED_DS18B20];  
volatile unsigned int maxtempsendcnt[MAX_ATTACHED_DS18B20];
volatile unsigned int flowsendcnt[NFLOWS];
volatile unsigned int maxflowsendcnt[NFLOWS];
volatile bool flow_status[NFLOWS];              // status of flow (on or off cycle)
volatile unsigned long flow_cnt[NFLOWS];        // counter volume for each flow sensor
volatile unsigned int intervalcnt[NFLOWS];      // keep track of number of milliseconds since we had previous flow info

void before() { 
  for (uint8_t i=0; i<NFLOWS; i++) {
    pinMode(FlowPins[i], INPUT);
  }
  // Startup up the OneWire library
  sensors.begin();
  for (uint8_t i=0; i<NFLOWS; i++) {
    oldflow[i] = 0;
    flow_status[i] = false;
    flow_cnt[i] = 0;
    oldflow_cnt[i] = 0;
    pcReceived[i] = false;
    flowsendcnt[i] = MIN_FLOW_SEND_FREQ;
    maxflowsendcnt[i] = MAX_SEND_FREQ;
    intervalcnt[i] = 0;
  }
  for (uint8_t i=0; i<MAX_ATTACHED_DS18B20; i++) { 
     lastTemperature[i]=0;
     tempsendcnt[i] = 0;
     maxtempsendcnt[i] = MAX_SEND_FREQ;
  }
}

void setup() {
   Serial.println("setup()");
   // Timer0 is already used for millis() - we'll just interrupt somewhere
   // in the middle and call the TIMER0_COMPA_vect interrupt
   OCR0A = 0xAF;
   TIMSK0 |= _BV(OCIE0A);
   sensors.setWaitForConversion(true);
   // Fetch last known pulse count value from gw
   for (uint8_t i=0; i<NFLOWS; i++) {
     request(FLOW_ID+i, V_VAR1);
   }
}

void presentation()  {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("WTW flow sensor", "1.2");

  // Register all sensors to gw (they will be created as child devices)
  numSensors = sensors.getDeviceCount();
  Serial.print("# temp sensors: ");
  Serial.println(numSensors);
  DeviceAddress add;
  for (uint8_t i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) { 
     present(TEMP_ID+i, S_TEMP);
     Serial.print(i);
     Serial.print("=");
     sensors.getAddress(add, i);
     printAddress(add);
     Serial.println();
  }
  for (uint8_t i=0; i<NFLOWS; i++) {
    present(FLOW_ID+i, S_WATER);
  }
}

// function to print a device address of a Dallas temp sensor
void printAddress(DeviceAddress deviceAddress) {
  for (uint8_t i = 0; i < 8; i++) {
    // zero pad the address if necessary
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}


void loop() {
  // we come here every 1000 ms (defined in CHECK_FREQUENCY)
  
  // now handle temperature
  if (numSensors>0) {
    sensors.requestTemperatures();
    for (uint8_t i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {
      // Fetch and round temperature to one decimal
      float temperature = static_cast<float>(static_cast<int> (sensors.getTempCByIndex(i) * 10.)) / 10.;
  
      // Only send data if temperature has changed and no error
      if (((lastTemperature[i] != temperature && tempsendcnt[i]==0) || maxtempsendcnt[i]==0) && temperature != -127.00 && temperature != 85.00) {
        // Send in the new temperature
        send(tempmsg.setSensor(TEMP_ID+i).set(temperature,1));
        // Save new temperature for next compare
        lastTemperature[i]=temperature;
        tempsendcnt[i] = MIN_SEND_FREQ;
        maxtempsendcnt[i] = MAX_SEND_FREQ;
      }
    }
    for (uint8_t i=0; i<NFLOWS; i++) {
       if ((flowsendcnt[i]==0 && (oldflow_cnt[i] != flow_cnt[i])) || (flowsendcnt[i]==0 && oldflow[i] != 0) || maxflowsendcnt[i]==0) {
          if (!pcReceived[i]) {   //Last Pulsecount not yet received from controller, request it again
             Serial.print("Re-request var1 for sensor ");
             Serial.println(FLOW_ID+i);
             request(FLOW_ID+i, V_VAR1);
             wait(2*CHECK_FREQUENCY); // wait at least 1000 ms for gateway (cannot be sleep or smartSleep)
             return;
          }
          flowsendcnt[i] = MIN_FLOW_SEND_FREQ;
          maxflowsendcnt[i] = MAX_SEND_FREQ;
          double volume = ((double)flow_cnt[i]/((double)PULSE_FACTOR));      
          double flow = (((double) (flow_cnt[i]-oldflow_cnt[i])) * ((double) 60000.0 / ((double) intervalcnt[i]))) / ppl;  // flow in liter/min

          Serial.print("Flow meter:");
          Serial.println(FLOW_ID+i);
          Serial.print("pulsecount:");
          Serial.println(flow_cnt[i]);
          Serial.print("volume:");
          Serial.println(volume, 3);
          Serial.print("l/min:");
          Serial.println(flow);
          intervalcnt[i] = 0;
          oldflow[i] = flow; 
          oldflow_cnt[i] = flow_cnt[i];
          send(lastCounterMsg.setSensor(FLOW_ID+i).set(flow_cnt[i]));     // Send  pulsecount value to gw in VAR1
          send(volumeMsg.setSensor(FLOW_ID+i).set(volume, 3));            // Send volume (set function 2nd argument is resolution)
          if (flow<MAXFLOWERROR) send(flowMsg.setSensor(FLOW_ID+i).set(flow, 2));                // Send flow value to gw
       }
    }
  }

  // Serial.print(end_loop-start_loop);
  wait(CHECK_FREQUENCY);
}

// Receive data from gateway
void receive(const MyMessage &message) {
  for (uint8_t i=0; i<NFLOWS; i++) {
     if (message.type==V_VAR1 && message.sensor==FLOW_ID+i) {
        unsigned long gwPulseCount=message.getULong();
        flow_cnt[i] += gwPulseCount;
        oldflow_cnt[i] += gwPulseCount;
        oldflow[i] = 0;
        Serial.print("Received last pulse count for ");
        Serial.print(FLOW_ID+i);
        Serial.print(" from gw:");
        Serial.println(gwPulseCount);
        pcReceived[i] = true;
     }
  }
}


// Interrupt on timer0 - called as part of timer0 - already running at 1ms intervals
SIGNAL(TIMER0_COMPA_vect) {
  if (mcnt>0) mcnt--;
  for (uint8_t i=0; i<NFLOWS; i++) {
     if (mcnt==0) {
        if (flowsendcnt[i]>0) flowsendcnt[i]--;
        if (maxflowsendcnt[i]>0) maxflowsendcnt[i]--;
     }
     intervalcnt[i]++;
     bool val = digitalRead(FlowPins[i]);
     if (val != flow_status[i]) {
        flow_status[i] = val;
        if (!val) flow_cnt[i]++;      // we increment counter on down flank
     }
  }
  if (mcnt==0) {
     mcnt = CHECK_FREQUENCY;
     for (uint8_t i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) { 
        if (tempsendcnt[i]>0) tempsendcnt[i]--;
        if (maxtempsendcnt[i]>0) maxtempsendcnt[i]--;
     }
  }
}

Good luck

Bart

zboblamont

@mrc-core If I do a search for "B93 315.04 lisboa" I get MSV Janz company turn up, but I don't understand Portugese. It is probably a magnetic drive even at 1997 fabrication, but perhaps some searching will yield clues or contact the manufacturer?

mrc-core

@zboblamont I have already read that pdf there they say this:

"The design of the Magnetic Transmission reduces the number of components
Operating in the water, increasing the reliability of the meter."

They also say this in the pdf:

"Any of these models can be supplied ready to receive the
Pulse transmission (see tele-count catalog). Ex .: MSV 1520t"

In this last information i made a search for MSV 1520t were i found again another pdf that talks about my water meter.
Here's the link: http://resopre.pt/conteudo.php?fam=CONTADORES,CONT_DOMESTICOS&pag=AGUA_RESOPRE.PT&detail=693

You can see 5 water meters on that link all off them say's Magnetic Transmission "Transmissão magnética" but has you can see none off them look like mine. Has i can understand mine is the more basic off them all i do belive that i have the first generation off this water meters.

I have done one last test yesterday leaving a water tap open and passed the hall sensor all over the water meter from side to side and top to bottom and never got any impulse digital led light turning on.
The led did turned on when i put my finger in the top off the sensor or in cables near the pins of the sensor.

zboblamont

@mrc-core Well, I did suggest contacting the manufacturer with the information on your meter, they are better able to advise or may even sell a sensor head to retrofit. Usually these manufacturers are very helpful, and at least you speak the language.
I know that some manufacturers insist on factory building the sensor arrangement inside the meter (Zenner?) but you may be lucky.
The magnetic drive is more to avoid mechanical connection between the metering section and the water flow, so no axle or sealing ring to leak !
I have a plastic Elster, it has the same magnetic coupling as yours, but I was unable to sense any changing magnetic field when I checked it, but I had already ordered the specific read head for it so was not unduly concerned, and it should arrive in next few days. This sensor pulses when a small metal arc on the small dial passes beneath the sensor every 1 litre. It was around 30 euro from memory, so not a mad price.

ladislav

Hello,
i have got water meter with pulse output. So I have just arduino and RFM69W. Sleep mode false/true works well with standard bootloader. Optiboot with sleep mode false works also well. But I would like to run it on battery optiboot with true sleep mode which doens work correctly. Sensor doesnt receiceve last pulse count from gw.
Any idea how to fix it?

0 MCO:BGN:INIT NODE,CP=RRNNA--,VER=2.1.1
4 TSM:INIT
4 TSF:WUR:MS=0
8 TSM:INIT:TSP OK
10 TSM:INIT:STATID=3
12 TSF:SID:OK,ID=3
14 TSM:FPAR
145 TSF:MSG:SEND,3-3-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
743 TSF:MSG:READ,0-0-3,s=255,c=3,t=8,pt=1,l=1,sg=0:0
747 TSF:MSG:FPAR OK,ID=0,D=1
2152 TSM:FPAR:OK
2152 TSM:ID
2154 TSM:ID:OK
2156 TSM:UPL
2164 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2179 TSF:MSG:READ,0-0-3,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2185 TSF:MSG:PONG RECV,HP=1
2189 TSM:UPL:OK
2191 TSM:READY:ID=3,PAR=0,DIS=1
2201 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2254 TSF:MSG:READ,0-0-3,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2269 TSF:MSG:SEND,3-3-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.1.1
2283 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
2336 TSF:MSG:READ,0-0-3,s=255,c=3,t=6,pt=0,l=1,sg=0:M
2351 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=11,pt=0,l=11,sg=0,ft=0,st=OK:Water Meter
2367 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.1
2381 TSF:MSG:SEND,3-3-0-0,s=3,c=0,t=21,pt=0,l=0,sg=0,ft=0,st=OK:
2387 MCO:REG:REQ
2398 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
2451 TSF:MSG:READ,0-0-3,s=255,c=3,t=27,pt=1,l=1,sg=0:1
2457 MCO:PIM:NODE REG=1
2461 MCO:BGN:STP
2469 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2476 MCO:BGN:INIT OK,TSP=1

2486 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2500 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2514 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2527 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2541 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2555 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2570 TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2707 !TSF:MSG:SEND,3-3-0-0,s=3,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=NACK:

dpcr

Has it ever received a pulse count?

ladislav

When its about 2 metres far from gateway its received. Afterthat can be moved 10 metres away and it works. But after reset has to be moved close to gateway again.
I run also power meter pulse sensor. This has got different issue. It falls asleep before receiving pulse count from gw.

dpcr

@ladislav Sounds like a radio problem. Are you using a capacitor on the radio power supply pins? A capacitor on all radios in your network. I have a an Ethernet gateway in our basement and a node in our attic that is two floors above it and it works fine using a NRF24 for all radios and the radio power is on the default setting and it communicates fine.

smilvert

I having problem to place the tcrt5000 on the correct place. Can anyone please show where to put it? Is it over the black (that spins every 0.5 l)?

I have this type of water meter alt text

bart59

@smilvert I am afraid your water meter does not work. On many other watermeters the black spinning wheel is somewhat bigger and has a small mirror attached. The light from the IR LED is reflected by the mirror and the IR sensor picks up the reflection as a pulse every rotation (in your case 0.5 L). I suggest you buy another water meter that has a sensor build in and provides you with a direct signal. In my home I have separate water meters for each water consumer (such shower, hot water, kitchen, etc.).

I am using a Honeywell C7195A2001B which has a hall sensor that pulses at 7 Hz per liter/min, so you will get 420 pulses per liter. These meters are typically used in boiler or central heating systems that also can provide hot water for your shower. You need to modify the source code a bit to handle the high pulse frequency, but the nice thing is that the measurement is very accurate.

regards

Bart

dpcr

@smilvert You could try a magnometer. I successfully used one on my gas meter that didn't have a magnet in it. Look up "gas meter using a magnometer" in this forum. The code is much different than using the standard water meter sketch.

rejoe2

@smilvert @dpcr
I really doubt this type of water meter having a magnet to sense. Gas meters often are prepared to use a special reed swich to be mounted somewhere outside on the enclosure, and the magnet comes pretty close to the enclosure to be sensed.

I somewhere found a different solution approach using a modified TCRT5000 board with green LED and a specific lightsensor (see here for details, german).

The idea behind it is to use complementary (green) light to one of the red pointer wheels to improve contrast when the small pointer passes.

I recently did some first test wrt. to this, but different to the mentioned solution, I used the original LED/sensor places to connect these two parts (and also changed the resistors values). Unfortunately, I wasn't able to test it "at the right place" until now. As far as I can see, the TCRT5000 inside just also consist of two seperate parts inside a housing. So you may try to do it like that: just pull of the plastic housing, change the LED (see TCRT datasheet which one) with a green one, focus LED and sensor a little more than normal and see, if you get reasonable results whith the trimming resistor.

Glad for feedback, if this works...

dpcr

@rejoe2 A magnetometer doesn't need a magnet to work, my gas meter doesn't have a magnet and it works fine. Most all smartphones have magnetometers in them to sense direction. However your solution looks to work as well and probably with less code.

rejoe2

@dpcr Thanks for clarification.
Today there was a new post that may be of interest wrt. to the "green" LED sensing modification: https://forum.fhem.de/index.php?action=post;quote=702342;topic=71341.0;last_msg=702342
This one seems to be close to a "professional" solution also wrt. to the other parts used (but most likely not on a TCRT5000-Base)...

RPunkt

I have a question and need some advise,
is it possible to expand the sketch to two meters.
In my case I want to combine a this Water Meter with a Gas Meter.
Can both meters use an interrupt, each?

mfalkvidd

@rpunkt welcome to the MySensors community!

it depends on which microcontroller you use, and what type of interrupt.

Atmega328 can use pin 2 and 3 at the same time by merging the sketches. More/other pins can be used but that will require some code changes.

flopp

@smilvert
I also have same meter as the picture. Yesterday I installed my sensor
I took a TCRT5000 IR sensor, https://www.mysensors.org/store/water
A cap from a soda bottle, cut it so it fits above left red wheel(X0,0001) which means one lap i 1 liter
It works but it counts little bit wrong, I have change the

if (interval<500000L)

to

if (interval<2500000L)

but anyway it counts about 3 times to much. I will check it later today

flopp

@flopp
This didn't worked so well, I got a lot of errors everytime nRF was sending data, then I got one pulse.
Anyone know how to protect the digital input to NOT fall when nRF sends?
Wait, when I was writing this text I just remember that nRF is using Pin 2, is that correct?
I will try to use pin 3 instead, as interrupt pin

flopp

@flopp
tried pin3, didn't help

Can it be something wrong with LM393(pcb)?

smilvert

@flopp Nice. You don't use a green led? I tried that and it seems to work better but then I struggle with the mounting.

Need to try this again!

flopp

@smilvert said in Water Meter Pulse Sensor:

You don't use a green led? I tried that and it seems to work better but then I struggle with the mounting.

I am using IR to detect movements. Green LED is flashing eveytime the IR detects movement and Red LED is power for PCB.
I am using Digital Output from PCB to pin 2 or 3 on my UNO. I have tried both with INPUT_PULLUP and without, also tried 20K between Digital Output and GND. nothing is helping

How do you use green LED with water meter?

noname

Hi all i just wanna see The OUTPUT of Serial Monitor for this project sow i can see results .

gohan

Just enable the my_debug

Bur Han

How can i get the pulses from SonOff.... i cannot find any digital pin 3 in sonoff... im new to this please guide me

Soloam

Any one used this approach? From the text I see that the node sleeps! How does it measures the consumption if the node is sleeping?

Thank you

mfalkvidd

@soloam could you clarify what you refer to when saying "this"? Earlier posts discuss infrared, led, magnetometer and other solutions so it is a bit hard to answer your question.

Soloam

@mfalkvidd hello!

I was referring to this statement in the site:

"Use this mode if you power the sensor with a battery. In this mode the sensor will sleep most of the time and only report the cumulative water volume."

Thank you

gohan

according to the sensor you use, each pulse should wake the node and add a count, then back to sleep.

Soloam

That is nice! But I would have to test it out! Probably that would make the node all the time awake during a long bath! Ok, it would not use the radio all the time, but I would like to know who that would affect the battery!

Thank you all for the feedback

kimot

@soloam
We sometimes forgot about other circuit than Arduino.
Use CMOS counter IC and wake up your Arduino for example every 20 impulse and read counter status.
If you want Safe battery.

bjornhallberg

@flopp Did you ever manage to stabilize the readings? Am I understanding you correctly that the readings were fine but the transmission got the reading scrambled?

Did you try to find a magnetic field with the meter instead? I have a similar meter and I'm wondering how best to approach the problem. I've seen people hook up Raspberries and cameras to do OCR basically but that seems like way too complex for an easy problem.

bjacobse

@flopp said in Water Meter Pulse Sensor:

TCRT5000 IR senso

I have not had good results using TCRT5000 IR sensor, did you?
@bjornhallberg well I still think this is the best approach to use RPI + OCR

https://forum.mysensors.org/topic/1594/automatic-water-meter-reading-with-a-webcam
https://blog.m.nu/vattenmatning-med-raspberry-pi-och-webkamera/

bjornhallberg

While looking into the water meter I realized that we are getting a "smart" meter replacement soon. I'll see if I can speed up the replacement schedule. Anyhow, the replacement is a Kamstrup Multical 21 (https://www.kamstrup.com/en-en/water-solutions/water-meters/multical-21) which has several options for reading:

Requesting the data via optical interface?
Enabling the pulse function via optical interface, and then reading the IR pulse at 1imp/10lit.
Reading the wireless mbus signal? (e.g. https://github.com/weetmuts/wmbusmeters)

zboblamont

@bjornhallberg Suggest you discuss with your water supplier, and see what THEY intend to deploy for comms and explain what your own objectives are, that may refine what you are looking at, and they MIGHT actually help rather than be play "stupid" which is unfortunately common nowadays. In all probability they will be looking at wireless m-bus for drive-by readings, this is the predominant method of retrieval.
I admit to surprise at them deploying ultrasonics, they are on the expensive end of the market but they are extremely reliable and accurate.

flopp

@bjacobse said in Water Meter Pulse Sensor:

@flopp said in Water Meter Pulse Sensor:

TCRT5000 IR senso

I have not had good results using TCRT5000 IR sensor, did you?

I didn’t get it to work.
I was so lucky that my water company change the meter to a meter with wireless m-bus.
So I bought a box for this and now I have 100% correct readings.

zboblamont

@bjacobse Another option perhaps to consider (if it is physically viable), is to insert a meter and sensor of your choice within your property, they are not expensive nowadays and easy enough to fit ?
A simple meter and reed switch such as this link text or similar perhaps.

bjacobse

@zboblamont
In Sweden you need a certified installer to exchange your pipes, else in case of water damage your insurance won't cover.
so cheapest for me is a RPI with camera - but yes I would prefer a "real" measuring from a dedicated sensor

zboblamont

@bjacobse Pardon my laughter, insurers look for any excuse for sure, but I have never heard yet where a water meter or any other competent insertion damaged a building, let alone an insurance company refused to compensate for a building which burned to the ground (99.9%) on the basis the water meter was not a verified install. For sure some loss adjusters will use any excuse, but really?
To clarify, in many countries a certified inspector or Engineer must certify that work is carried out within the regulations, it does not state that HE/SHE has carried out the work, only that it has been inspected and verified as compliant. You know any certified local plumbers with 5 minutes to spare, because that is how long it takes me to fit one, and about the time it takes a certified pipe-jockey to verify it's right and sign it off, if it really concerns you ?

I have 2 self fitted water meters with sensors, gas meter sensor etc, and a huge amount of DIY stuff any smartass insurer could IMPLY was a contributory factor to the disaster which befell my house, but frankly it wouldn't stand 1 second in Court before being laughed out...
Place hasn't burned down yet, fallen over in earthquakes, or been subjected to landslide, but luckily I don't have Swedish Insurers....
PS- I should clarify that the standing regulations are framed to quite rightly protect consumers as well as the service provider against cowboys interfering with apparatus. Changing light switches or sockets falls under the same overall umbrella despite everyone and their mother changing them.

fredswed

@bjacobse I believe you can replace the meter yourself if you own it yourself and have the necessary skills. I live in such an area and was told I could mount it myself if I was confident enough. But of course, the fault will be yours if your bad job causes damages. In reality it is quite unlikely that you can mount it badly and not notice the problem immediately.

A more critical issue is that water meters are usually owned by the municipality or water company and they are sealed. It is impossible to replace the meter without breaking the seal and when the company notices they won't be happy at all.

zboblamont

@fredswed And by extension (Possibly Swedish water suppliers differ from UK or Romanian counterparts?) the data retrieved from their devices is often regarded as their property also, and brick walls begin to appear ino what should be readily shared data. If they will not share, fitting a downstream device within your own control can often be the only solution, don't interfere, augment...

As a perverse example, my own gas and electricity suppliers are the German monolith EON who provide and enable access to their 'graphs' online, updated with 1 or 2 month readings (gas and electricity).
Having checked the base data for their graphs, I realised they were presenting a lovely graph based on complete bunkum, and developed and maintained my own ever since, which IS accurate. I checked recently and their graphs are still pretty but complete rubbish.
Installing a gas meter sensor caused EON palpitations until they realised it was the commercial device for the meter and could not object on technicalities then quietly dropped objections, I don't care how they respond when I fit meters to the Consumer box, it is nowhere near their SMART meter which tells me nothing but tells them much, mainly that I halved their 2 monthly bill .
If the service provider will allow detailed sharing of YOUR data, all good and well as it is mutually beneficial, but if not, easy enough to solve at your own expense.
I fitted two replacement upgraded radiators in the last month, somewhere a Romanian regulation lurks that I should not have done so, but the insurer doesn't give a damn unless it is found to have caused the demise of the insured property.. Is it worth the risk? Hell yes...

JohnLi

It looks very interesting. I complied and uploaded successful, but it ran without run the loop function at all. infrared sensor lighted up but no print out attached Serial.print.
Can you give us the url to the library #include <MySensors.h>?. I am using MySensors 2.3.1 loaded from Adruino IDE->Tools->Manage Libary->search My Sensors from https://www.mysensors.org

4:55:53.476 -> 60127 TSM:FAIL:RE-INIT
14:55:53.476 -> 60129 TSM TSM:FAIL:DIS
14:55:53.476 -> 900384 TSF:TDI:TSL
14:55:54.962 ->
14:55:54.962 -> __ __ ____
14:55:54.962 -> | / |_ / | ___ _ __ ___ ___ _ __ ___
14:55:54.962 -> | |/| | | | _ \ / _ \ _ \/ __|/ _ \| _/ __|
14:55:54.962 -> | | | | || || | / | | _ \ _ | | _
14:55:54.962 -> || ||_, |/ ___|| ||/_/|| |/
14:55:54.962 -> |__/ 2.3.1
14:55:54.962 ->
14:55:54.962 -> 16 MCO:BGN:INIT NODE,CP=RNNNA---,REL=255,VER=2.3.1
14:55:54.962 -> 26 TSM:INIT
14:55:54.962 -> 27 TSF:WUR:MS=0
14:55:54.997 -> 33 !TSM:INIT:TSP FAIL
14:55:54.997 -> 35 TSM:FAIL:CNT=1
14:55:54.997 -> 37 TSM:FAIL:DIS

gohan

it looks like it is can't find the radio module. Check cables and pins numering

executivul

Sorry to hijack the thread a bit,
I'm using a TCRT5000 sensor to read a water meter (Zenner), it works ok until it stops detecting pulses, I have to increase the sensitivity (clockwise turn the trimpot) and it works ok for another few days/weeks, then again it needs an increase in sensitivity, like somehow it's loosing it's sensitivity .
I'm already with my second sensor, the first one got to the end of the trimpot and couldn't adjust anymore.

Has this happened to anyone else? It's powered by 5V, it's the LED losing power or the photosensor losing sensitivity? Any ideas?
Thanks.

gohan

Don't you have another sensor to try?

Alehandro06

@flopp which box did you buy for m-bus readings? did you work it out?
''I was so lucky that my water company change the meter to a meter with wireless m-bus.
So I bought a box for this and now I have 100% correct readings.''

bereska

Water Meter shows up in mysensors.json and homeassistant logs but fails to appear in Homeassistant GUI.
I have a dozen Nodes already successfully operating
I used the default sketch on this page. Just added Node 6
Looks like values are not getting through
Thank you for your help

bereska

this is HA log:

2019-07-04 23:24:05 DEBUG (MainThread) [homeassistant.components.mqtt] Received message on mygateway1-out/6/255/3/0/11: b'Water Meter',
2019-07-04 23:24:05 DEBUG (MainThread) [mysensors.gateway_mqtt] Receiving 6;255;3;0;11;Water Meter,
2019-07-04 23:24:23 DEBUG (MainThread) [homeassistant.components.mqtt] Received message on mygateway1-out/6/255/3/0/11: b'Water Meter',
2019-07-04 23:24:23 DEBUG (MainThread) [mysensors.gateway_mqtt] Receiving 6;255;3;0;11;Water Meter

bereska

here is the sketch:

// Enable debug prints to serial monitor
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_RF24
#define MY_NODE_ID 6
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95

#include <MySensors.h>

#define DIGITAL_INPUT_SENSOR 3                  // The digital input you attached your sensor.  (Only 2 and 3 generates interrupt!)

#define PULSE_FACTOR 1000                       // Number of blinks per m3 of your meter (One rotation/liter)

#define SLEEP_MODE false                        // flowvalue can only be reported when sleep mode is false.

#define MAX_FLOW 40                             // Max flow (l/min) value to report. This filters outliers.

#define CHILD_ID 1                              // Id of the sensor child

uint32_t SEND_FREQUENCY =
    30000;           // Minimum time between send (in milliseconds). We don't want to spam the gateway.

MyMessage flowMsg(CHILD_ID,V_FLOW);
MyMessage volumeMsg(CHILD_ID,V_VOLUME);
MyMessage lastCounterMsg(CHILD_ID,V_VAR1);

double ppl = ((double)PULSE_FACTOR)/1000;        // Pulses per liter

volatile uint32_t pulseCount = 0;
volatile uint32_t lastBlink = 0;
volatile double flow = 0;
bool pcReceived = false;
uint32_t oldPulseCount = 0;
uint32_t newBlink = 0;
double oldflow = 0;
double volume =0;
double oldvolume =0;
uint32_t lastSend =0;
uint32_t lastPulse =0;

void setup()
{
  // initialize our digital pins internal pullup resistor so one pulse switches from high to low (less distortion)
  pinMode(DIGITAL_INPUT_SENSOR, INPUT_PULLUP);

  pulseCount = oldPulseCount = 0;

  // Fetch last known pulse count value from gw
  request(CHILD_ID, V_VAR1);

  lastSend = lastPulse = millis();

  attachInterrupt(digitalPinToInterrupt(DIGITAL_INPUT_SENSOR), onPulse, FALLING);
}

void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Water Meter", "1.1");

  // Register this device as Water flow sensor
  present(CHILD_ID, S_WATER);
}

void loop()
{
  uint32_t currentTime = millis();

  // Only send values at a maximum frequency or woken up from sleep
  if (SLEEP_MODE || (currentTime - lastSend > SEND_FREQUENCY)) {
    lastSend=currentTime;

    if (!pcReceived) {
      //Last Pulsecount not yet received from controller, request it again
      request(CHILD_ID, V_VAR1);
      return;
    }

    if (!SLEEP_MODE && flow != oldflow) {
      oldflow = flow;

      Serial.print("l/min:");
      Serial.println(flow);

      // Check that we don't get unreasonable large flow value.
      // could happen when long wraps or false interrupt triggered
      if (flow<((uint32_t)MAX_FLOW)) {
        send(flowMsg.set(flow, 2));                   // Send flow value to gw
      }
    }

    // No Pulse count received in 2min
    if(currentTime - lastPulse > 120000) {
      flow = 0;
    }

    // Pulse count has changed
    if ((pulseCount != oldPulseCount)||(!SLEEP_MODE)) {
      oldPulseCount = pulseCount;

      Serial.print("pulsecount:");
      Serial.println(pulseCount);

      send(lastCounterMsg.set(pulseCount));                  // Send  pulsecount value to gw in VAR1

      double volume = ((double)pulseCount/((double)PULSE_FACTOR));
      if ((volume != oldvolume)||(!SLEEP_MODE)) {
        oldvolume = volume;

        Serial.print("volume:");
        Serial.println(volume, 3);

        send(volumeMsg.set(volume, 3));               // Send volume value to gw
      }
    }
  }
  if (SLEEP_MODE) {
    sleep(SEND_FREQUENCY);
  }
}

void receive(const MyMessage &message)
{
  if (message.type==V_VAR1) {
    uint32_t gwPulseCount=message.getULong();
    pulseCount += gwPulseCount;
    flow=oldflow=0;
    Serial.print("Received last pulse count from gw:");
    Serial.println(pulseCount);
    pcReceived = true;
  }
}

void onPulse()
{
  if (!SLEEP_MODE) {
    uint32_t newBlink = micros();
    uint32_t interval = newBlink-lastBlink;

    if (interval!=0) {
      lastPulse = millis();
      if (interval<500000L) {
        // Sometimes we get interrupt on RISING,  500000 = 0.5 second debounce ( max 120 l/min)
        return;
      }
      flow = (60000000.0 /interval) / ppl;
    }
    lastBlink = newBlink;
  }
  pulseCount++;
}```

bereska

looks like the problem is the node is NOT sending initial value to gw
need your help modifying the sketch accordingly
thank you

bereska

Is it possible to get any help on this page or not?

rejoe2

@bereska said in Water Meter Pulse Sensor:

Is it possible to get any help on this page or not?

Crying out loud most likely will not help...
Seems your setup is a little special, so just some assumptions from one using a serial GW and not MyS-MQTT:
Your controller is asked for sending an initial value, but has none yet. So no answer is sent out. Triggering the counter on Node side could help to send one (after waiting time has passed). Then have a look at your controller, if there's a value available. If, you might set the correct value, restart your node afterwards and see, if everything now works as expected?

bereska

@rejoe2 thank you. How do i trigger "the counter on Node side"?

rejoe2

...just let the node count some pulses (your code states: FALLING). So just pull the counter PIN (here: D3) to ground several times.

bereska

@rejoe2 i did like you said, still no show in HA
here is the serial log:

 __  __       ____
|  \/  |_   _/ ___|  ___ _ __  ___  ___  _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| |  | | |_| |___| |  __/ | | \__ \  _  | |  \__ \
|_|  |_|\__, |____/ \___|_| |_|___/\___/|_|  |___/
        |___/                      2.3.0

16 MCO:BGN:INIT NODE,CP=RNNNA---,VER=2.3.0
26 TSM:INIT
28 TSF:WUR:MS=0
34 !TSM:INIT:TSP FAIL
36 TSM:FAIL:CNT=1
38 TSM:FAIL:DIS
40 TSF:TDI:TSL
 
 __  __       ____
|  \/  |_   _/ ___|  ___ _ __  ___  ___  _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| |  | | |_| |___| |  __/ | | \__ \  _  | |  \__ \
|_|  |_|\__, |____/ \___|_| |_|___/\___/|_|  |___/
        |___/                      2.3.0

16 MCO:BGN:INIT NODE,CP=RNNNA---,VER=2.3.0
26 TSM:INIT
28 TSF:WUR:MS=0
34 TSM:INIT:TSP OK
36 TSM:INIT:STATID=6
38 TSF:SID:OK,ID=6
40 TSM:FPAR
77 TSF:MSG:SEND,6-6-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
532 TSF:MSG:READ,0-0-6,s=255,c=3,t=8,pt=1,l=1,sg=0:0
538 TSF:MSG:FPAR OK,ID=0,D=1
624 TSF:MSG:READ,31-31-6,s=255,c=3,t=8,pt=1,l=1,sg=0:1
1267 TSF:MSG:READ,21-21-6,s=255,c=3,t=8,pt=1,l=1,sg=0:1
1546 TSF:MSG:READ,41-41-6,s=255,c=3,t=8,pt=1,l=1,sg=0:1
2088 TSM:FPAR:OK
2088 TSM:ID
2091 TSM:ID:OK
2093 TSM:UPL
2097 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2103 TSF:MSG:READ,0-0-6,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2109 TSF:MSG:PONG RECV,HP=1
2113 TSM:UPL:OK
2115 TSM:READY:ID=6,PAR=0,DIS=1
2119 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2127 TSF:MSG:READ,0-0-6,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2138 TSF:MSG:SEND,6-6-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.3.0
2148 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
2242 TSF:MSG:READ,0-0-6,s=255,c=3,t=6,pt=0,l=1,sg=0:M
2250 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=11,pt=0,l=11,sg=0,ft=0,st=OK:Water Meter
2260 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.1
2273 TSF:MSG:SEND,6-6-0-0,s=1,c=0,t=21,pt=0,l=0,sg=0,ft=0,st=OK:
2281 MCO:REG:REQ
2289 TSF:MSG:SEND,6-6-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
2297 TSF:MSG:READ,0-0-6,s=255,c=3,t=27,pt=1,l=1,sg=0:1
2304 MCO:PIM:NODE REG=1
2306 MCO:BGN:STP
2310 TSF:MSG:SEND,6-6-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:
2318 MCO:BGN:INIT OK,TSP=1
32319 TSF:MSG:SEND,6-6-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:

rejoe2

@bereska said in Water Meter Pulse Sensor:

32319 TSF:MSG:SEND,6-6-0-0,s=1,c=2,t=24,pt=0,l=0,sg=0,ft=0,st=OK:

Logparser states: there was nothing counted (empty payload). So make sure, there really was counted anything.
(I didn't check your sketch, just assuming, it's the default one and everything is wired correctly; if that's the case, you should be able to see a different payload than nothing or "0", that your controller might treat as non existent).

stevefury

@mfalkvidd how looks the sensor now with the modifications? and how to wire this?

mfalkvidd

@stevefury sorry, I don't understand. Which modifications are you referring to?

ibibiuooui

I'm just getting this....

16:57:15.660 -> 10091 TSM:FAIL:RE-INIT
16:57:15.660 -> 10093 TSM:INIT
16:57:15.660 -> 10101 !TSM:INIT:TSP FAIL
16:57:15.660 -> 10103 TSM:FAIL:CNT=2
16:57:15.660 -> 10107 TSM:FAIL:DIS
16:57:15.713 -> 10111 TSF:TDI:TSL

rejoe2

@ibibiuooui said in Water Meter Pulse Sensor:

!TSM:INIT:TSP FAIL

See https://www.mysensors.org/build/parser: There's a problem in the initialisation of your transceiver (whatever it may be). So first check wiring, see https://forum.mysensors.org/topic/666/read-this-first-it-could-save-you-a-lot-of-time for further details. If that doesn't help, imo you should open up a seperate thread.

CrankyCoder

I am finally getting around to trying this out. I was playing with just trying to see if i can get the pulses. First thing i did was take an old compass and put it beside the meter and had someone turn on the water. I could definitely see the compass needle pull a little as the water was flowing. So I assumed that pull was enough to be detectable with my hall effect sensor. I have tried a couple, and just can't seem to get it to pick up.

If i use a magnet, simple code will detect the pulse and the green led on the sensor lights up.

But no matter where I put that sensor near the meter it just doesn't seem to detect it. Not quite sure what's happening.

The meter i have is this one.
https://www.badgermeter.com/resources/add29b88-1ffb-49c9-80ab-bb8697bd6d1a/absolute digital encoder product data sheet ade-ds-00183-en.pdf/

Not sure if anyone has any recommendation on which hall effect sensor would be the best for this but ill take suggestions lol

My sensor I am testing with is
3144E Hall Effect Sensor

Doesn't have a sensitivity dial but the recommended one on this build page didn't either.

Emmanuel Abraham

@bart59 Can you post full circuit diagram for the modified code you made?

Paolo Rendano

I made some improvements on this sketch. Please review them here: https://github.com/mysensors/MySensors/pull/1540

with these changes you will have:
1 - factory reset
2 - automatic home assistant entities creation
3 - counter correction from home assistant using service notify.mysensors
4 - fixed counter automatically incremented by 1 at each device restart (due to arduino library interrupt bug)
5- other tiny improvements

JeeLet

Thanks for the feedback

For those who think MySensors is finished, the proof is in the pudding, thousands of systems are functional

StephanXL

I really like the update you did for Home Assistant integration.

But: I do not really understand, how to correctly send the VALUE_TO_ADD.

This is what I tried to add 967.067 m³:

service: notify.mysensors
data:
  message: VALUE_TO_ADD
  target: text.water_meter_100_2
  data: 967067

But I just get this error message:

Fehler beim Aufrufen des Diensts notify.mysensors. expected dict for dictionary value @ data['data']. Got None

These are my newly found entities:

What is wrong here?

StephanXL

I finally got this to work. Unlike what the description here says, this is how to update the value:
In Home Assistant, go to Developer->Service->YAML mode:

service: text.set_value
data:
  value: "967067"
target:
  entity_id: text.water_meter_100_2

(change 967067 with the value you want to add to the current counter)

The service "notify.mysensors" seems to be deprecated by Home Assistant.

💬 Water Meter Pulse Sensor

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