💬 Water Meter Pulse Sensor

[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.

[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

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