Problem with Wind Speed sensor
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@AWI said:
@rnollen the "inf" means infinite and is caused by a 0 division. You can try to remove the line starting with 'float' and print the time values.
I assume you changed the anemometer pin in the sketch to d7...?I have did some additional testing. The DC12 is wrong I think, when I use that then the whole sketch does not give any values back. Now used the 5V of the arduino, then I got something readings using this sketch. I have added some additional serial print lines for logging. But when times are zero, then the frequency is INF and that happens when I don't rotate, so that looks OK I think
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Timeon: 0
Timeoff: 0
TimePeriod: 0
Frequency: inf
Timeon: 0
Timeoff: 87951
TimePeriod: 87951
Frequency: 11.37
Timeon: 24222
Timeoff: 22899
TimePeriod: 47121
Frequency: 21.22
Timeon: 24960
Timeoff: 27680
TimePeriod: 52640
Frequency: 19.00
Timeon: 27545
Timeoff: 28273
TimePeriod: 55818
Frequency: 17.92
Timeon: 63310
Timeoff: 0
TimePeriod: 63310
Frequency: 15.80The serial.print lines:
Serial.print("Timeon: ");
Serial.println(timeon);
Serial.print("Timeoff: ");
Serial.println(timeoff);
Serial.print("TimePeriod: ");
Serial.println(timePeriod);
Serial.print("Frequency: ");
Serial.println(frequency);But any idea, because I am still lost don't know exactly what the conclusion of this is :)
@rnollen this looks much better. You get frequencies in the 10 to 20 range when rotating. The inf when you're not rotating are caused by timer overflow so nothing wrong there.
Now it is time for a more dedicated measurement. Basically replace the standard arduino routines with your own version. It is middle of the night here so I have to leave it for tomorrow... -
@AWI said:
@rnollen the "inf" means infinite and is caused by a 0 division. You can try to remove the line starting with 'float' and print the time values.
I assume you changed the anemometer pin in the sketch to d7...?I have did some additional testing. The DC12 is wrong I think, when I use that then the whole sketch does not give any values back. Now used the 5V of the arduino, then I got something readings using this sketch. I have added some additional serial print lines for logging. But when times are zero, then the frequency is INF and that happens when I don't rotate, so that looks OK I think
..
Timeon: 0
Timeoff: 0
TimePeriod: 0
Frequency: inf
Timeon: 0
Timeoff: 87951
TimePeriod: 87951
Frequency: 11.37
Timeon: 24222
Timeoff: 22899
TimePeriod: 47121
Frequency: 21.22
Timeon: 24960
Timeoff: 27680
TimePeriod: 52640
Frequency: 19.00
Timeon: 27545
Timeoff: 28273
TimePeriod: 55818
Frequency: 17.92
Timeon: 63310
Timeoff: 0
TimePeriod: 63310
Frequency: 15.80The serial.print lines:
Serial.print("Timeon: ");
Serial.println(timeon);
Serial.print("Timeoff: ");
Serial.println(timeoff);
Serial.print("TimePeriod: ");
Serial.println(timePeriod);
Serial.print("Frequency: ");
Serial.println(frequency);But any idea, because I am still lost don't know exactly what the conclusion of this is :)
@rnollen time for "Take 2" I created it in Codebender to make sure it compiles. Could not test functionality yet.
The "take 2" code implements a non-blocking measurement of the frequency of the anemometer (pulses per second). It should be safe for overflow.
Take 3 could be to translate it to m/s windspeed according to your type of anemometer and finally:
Take 4 MySensors' ise it!! -
@AWI Hmm.. I see this:
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
500.00
1000.00
0.00
inf
1000.00
0.00
0.00Don't think that this is correct right? Am I doing something wrong, or does these numbers say anything to you :)
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@AWI Hmm.. I see this:
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
1000.00
500.00
1000.00
0.00
inf
1000.00
0.00
0.00Don't think that this is correct right? Am I doing something wrong, or does these numbers say anything to you :)
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@AWI Sorry for the late reply, I got the flu :( But did test the sketch, but I got the same results basically.. Mostly 1000, inf and sometimes a 500? So what can be wrong here?
Thanks for all you're efforts so far!! Really appreciate it :)
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@AWI I am still ill, while doing this :) Hopefully tomorrow will be better, Hahaha.. :)
But, the results looks promising and OK I guess :)
8.13
10.87
14.08
20.00
27.78
23.81
25.64
10.75
0.00
1.81
12.66
11.49
10.75
10.00
9.35
8.85
8.33
7.87It's 0 when I am not turning it around, so that is OK. Low number, when rotating it slowly. High number when rotating it fast :)
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@AWI I am still ill, while doing this :) Hopefully tomorrow will be better, Hahaha.. :)
But, the results looks promising and OK I guess :)
8.13
10.87
14.08
20.00
27.78
23.81
25.64
10.75
0.00
1.81
12.66
11.49
10.75
10.00
9.35
8.85
8.33
7.87It's 0 when I am not turning it around, so that is OK. Low number, when rotating it slowly. High number when rotating it fast :)
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@rnollen take care.. This is how it should be (with the anemometer) I will post the MySensors version tomorrow (need some sleep now)
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@rnollen I made the sketch but forgot to post it... Have a look here
https://codebender.cc/sketch:347770
I does not compile in codebender.cc yet because of v2 MySensor but it should in the IDE.
Have fun and let me know the results
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@rnollen I made the sketch but forgot to post it... Have a look here
https://codebender.cc/sketch:347770
I does not compile in codebender.cc yet because of v2 MySensor but it should in the IDE.
Have fun and let me know the results
@AWI Great job. I'm planning to make my own anemometer, just because it's fun to do. And was already thinking about the problems that might occur. Hardware wise it's easy. Just use a hall sensor to detect pulses and a rotating magnet.
When the diameter of the magnet will be around 9cm, the magnet will reach the Hall sensor within 3ms or less if there's a Hurricane. That can be a problem because the sensor might think that the magnet isn't moving.
Because of that I was thinking about counting the pulses in a interrupt handler (pin 2 or 3) . And just let the loop periodically read the values and send them to the gateway if necessary.
Now comes my question for you. I was thinking of using some kind of decade counter IC. And let the IC handle the pulse counting. That way I only have to read and reset the counter IC. Do you happen to know a good counter IC that I can connect to the Arduino? It would make the project much easier.
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@AWI Great job. I'm planning to make my own anemometer, just because it's fun to do. And was already thinking about the problems that might occur. Hardware wise it's easy. Just use a hall sensor to detect pulses and a rotating magnet.
When the diameter of the magnet will be around 9cm, the magnet will reach the Hall sensor within 3ms or less if there's a Hurricane. That can be a problem because the sensor might think that the magnet isn't moving.
Because of that I was thinking about counting the pulses in a interrupt handler (pin 2 or 3) . And just let the loop periodically read the values and send them to the gateway if necessary.
Now comes my question for you. I was thinking of using some kind of decade counter IC. And let the IC handle the pulse counting. That way I only have to read and reset the counter IC. Do you happen to know a good counter IC that I can connect to the Arduino? It would make the project much easier.
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@TheoL I have to dig in my ancient history to find hardware for that purpose. An interrupt routine would be much easier and fast enough. (would be take 4 of this thread :smile:)
@AWI I know it's ancient stuff ;-) But very reliable. Maybe something like this? THE 4017B DECADE COUNTER But I don't know I it could handle the speed?
I'm also thinking about replacing the hall sensor with an infrared pulse sensor. It has a shorter on time than a magnet with a hall sensor. At least that's what I'm thinking ;-)
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@AWI Thanks for the sketch, but I still run in some issues. When i download the sketch, I got an error with the line "#include <MySensor.h> ". The strange thing is, everything seems to be OK, but it say it cannot be found. When I copy/paste the lines from a different sketch, it does work correct?? The strange thing is, I don't see difference. Maybe something wrong with a font or some sort?
But, then the issues really start. All the Mysensors stuff, is not recognized (e.g.send). I was able to fix that, copying from other sketches and add gw. before everything. In the serial monitor it then looks OK. That seems for me to solve the issues on that side.
But finally, in domoticz, it does not work then :( Everything is looking perfect, I see the sensors appear, but no new device is added). I saw a topic on the domoticz forum where the same thing happened :) and where you also replyed in: https://www.domoticz.com/forum/viewtopic.php?f=42&t=11490&p=82522&hilit=wind#p82522
Tried some various stuff, but no result sofar
Any idea?
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@AWI Thanks for the sketch, but I still run in some issues. When i download the sketch, I got an error with the line "#include <MySensor.h> ". The strange thing is, everything seems to be OK, but it say it cannot be found. When I copy/paste the lines from a different sketch, it does work correct?? The strange thing is, I don't see difference. Maybe something wrong with a font or some sort?
But, then the issues really start. All the Mysensors stuff, is not recognized (e.g.send). I was able to fix that, copying from other sketches and add gw. before everything. In the serial monitor it then looks OK. That seems for me to solve the issues on that side.
But finally, in domoticz, it does not work then :( Everything is looking perfect, I see the sensors appear, but no new device is added). I saw a topic on the domoticz forum where the same thing happened :) and where you also replyed in: https://www.domoticz.com/forum/viewtopic.php?f=42&t=11490&p=82522&hilit=wind#p82522
Tried some various stuff, but no result sofar
Any idea?
@rnollen it seems you are running into the changes related to the new development syntax. I wrote the sketch with the development version.. There are many threads on the forum discussing that so I won't repeat it here.
The sensor not appearing I remember from another wind sensor discussion. Domoticz builds it when a few wind types are present. You can add a wind direction dummy (presentation is already in the sketch, commented) and send a "0" degrees value.
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@AWI I know it's ancient stuff ;-) But very reliable. Maybe something like this? THE 4017B DECADE COUNTER But I don't know I it could handle the speed?
I'm also thinking about replacing the hall sensor with an infrared pulse sensor. It has a shorter on time than a magnet with a hall sensor. At least that's what I'm thinking ;-)
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@TheoL speed will not be an issue with these components if we are talking milliseconds. The atmega328p also has no problems there. So no need for additional hardware. But for the diehards a shift register can act as a modulo 2^ divider.
@AWI It's something I have to postpone till winter time ;-) But I'll keep it in mind. I never told about the buck converter you've send to me. Works like a charm much better than the power regulators I was using. Thank you for that. When things will start to settle down, I'll do a repost on my gesture controlled lamp. I've received some cheap gesture sensors so I'll be updating that part is well. Then it I'll be a very cheap project.
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@AWI Thanks for the sketch, but I still run in some issues. When i download the sketch, I got an error with the line "#include <MySensor.h> ". The strange thing is, everything seems to be OK, but it say it cannot be found. When I copy/paste the lines from a different sketch, it does work correct?? The strange thing is, I don't see difference. Maybe something wrong with a font or some sort?
But, then the issues really start. All the Mysensors stuff, is not recognized (e.g.send). I was able to fix that, copying from other sketches and add gw. before everything. In the serial monitor it then looks OK. That seems for me to solve the issues on that side.
But finally, in domoticz, it does not work then :( Everything is looking perfect, I see the sensors appear, but no new device is added). I saw a topic on the domoticz forum where the same thing happened :) and where you also replyed in: https://www.domoticz.com/forum/viewtopic.php?f=42&t=11490&p=82522&hilit=wind#p82522
Tried some various stuff, but no result sofar
Any idea?
@rnollen I updated the sketch for you with a dummy value of "0 degrees" windirection to keep Domoticz happy. (MySensors 2.0)
https://codebender.cc/sketch:347770 -
@AWI Thanks! The sketch works. But, I am not quite sure if the readings in m/s are correct. As a test, I have used a normal table fan, then I got 3.3 m/s on full speed..
Then I used a hairdryer, that on full speed.. It spins then very very fast, but it is still only 11 m/s. This is classified as normal, somewhat powerfull wind? Looks to me it's pretty low? Or could this correct for this case? :)'Edit-> Maybe it is correct :) Saw somewhere on internet a test with somewhat smaller hairdryer, which gave 9.5 m/s :)
Unfortunately I don't have any experience with windmeters :) Don't know how hard it should spin and how to test the output :) -
@AWI Thanks! The sketch works. But, I am not quite sure if the readings in m/s are correct. As a test, I have used a normal table fan, then I got 3.3 m/s on full speed..
Then I used a hairdryer, that on full speed.. It spins then very very fast, but it is still only 11 m/s. This is classified as normal, somewhat powerfull wind? Looks to me it's pretty low? Or could this correct for this case? :)'Edit-> Maybe it is correct :) Saw somewhere on internet a test with somewhat smaller hairdryer, which gave 9.5 m/s :)
Unfortunately I don't have any experience with windmeters :) Don't know how hard it should spin and how to test the output :)@rnollen My theory for calculating they outcome of your sensor is the following. All you need to know is the distance it takes from the pulse going from LOW (leaving the hall sensor) to HIGH triggering the hold sensor. If that's for instance 10 cm. Than the distance traveled by one full turn is 10cm. Let's say the wind will cause your windsensor to travel exactly once every second, the speed would by 600 cm's in 60 seconds. That's 1 meter per minute. So the wind speed would be 60 meter per hour which is known is 0 Beaufort.
If however the wind causes the sensor to turn exactly 3 times per second, that would be 30cm which is 0.3 m/s. Then the wind speed would be 1 Beaufort. Since 12 Beaufort starts at 32.6 m/s it would mean that your wind sensor would turn 3260 cm per second divided by 10 is 326 turns per second. which is roughly once every 3 millisecond.
But I'm hoping that someone can verify this theory ;-)
