Wind speed sensor node

[JohanRC]

Hi,

I am building a wind speed sensor node, but I am having diffictulty's in programming the code since I have not found any example code.
It is probably very easy but hey I am NOOB ;)

The sensor I am using has a 0 to 5V analog output for windspeeds from 0 to 32,4 m/s.
So what I did right now is I took the lightsensor example code and changed the formula to give me the value in m/s instead of lux, this already works.

But now I would also like it that my Domoticz gateway would also see it as a wind speed sensor instead of a light sensor.

Any hints/tips/help would be greatly appriciated!

Greetz Johan

[sundberg84]

Hi Johan!

Nice - what kind of hardware are you using? (I want to build one).
You need to present it as a wind sensor and not a light sensor.

[mfalkvidd]

Welcome Johan!
Change
V_LIGHT_LEVEL to V_WIND
and
S_LIGHT_LEVEL to S_WIND
The full specification of sensor types is available at http://www.mysensors.org/download/serial_api_15#message-structure-elements

[JohanRC]

Thanks guys I will try to change these valuess :)

For the anemometer I use to following:
http://www.aliexpress.com/item/0-5V-voltage-wind-speed-sensor-Voltage-output-Anemometer-360-degree-wind-speed-sensor/32371852577.html

Greetz Johan

[JohanRC]

Hmmz, just changing V_LIGHT_LEVEL to V_WIND and S_LIGHT_LEVEL to S_WIND doesnt seem to do the trick.
When these values are changed, Domoticz does not seem to recognize it any more (no new devices or updated lux values).

I think I am missing something here.

[A Former User]

@JohanRC Please post your sketch

[JohanRC]

This is the sketch that is working with just changing the formula:

#include <SPI.h>
#include <MySensor.h>  

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 0

unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)

MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_LIGHT_LEVEL);
int lastLightLevel;

void setup()  
{ 
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Light Sensor", "1.0");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);
}

void loop()      
{     
  int lightLevel = (analogRead(LIGHT_SENSOR_ANALOG_PIN))/31.605; 
  Serial.println(lightLevel);
  if (lightLevel != lastLightLevel) {
      gw.send(msg.set(lightLevel));
      lastLightLevel = lightLevel;
  }
  gw.sleep(SLEEP_TIME);
}

And than when I change it like below it doent seem to do anything anymore

#include <SPI.h>
#include <MySensor.h>  

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 0

unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)

MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_WIND);
int lastLightLevel;

void setup()  
{ 
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Light Sensor", "1.0");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_LIGHT, S_WIND);
}

void loop()      
{     
  int lightLevel = (analogRead(LIGHT_SENSOR_ANALOG_PIN))/31.605; 
  Serial.println(lightLevel);
  if (lightLevel != lastLightLevel) {
      gw.send(msg.set(lightLevel));
      lastLightLevel = lightLevel;
  }
  gw.sleep(SLEEP_TIME);
}

I think it is somewhere wrond in comunication text or something (I mean have a resonable amount of experiance in Arduino programming only not in the communication part).

Thanks!

[sundberg84]

Do you see anything I domoticz log? I'm thinking of you only changed sensor type it might not be supported. If so the log should tell you.

[JohanRC]

At 7:08 I changed to the "Wind" code, as you can see it sends its sketch info but nothing more

2016-01-20 07:01:02.472 Domoticz V2.3530 (c)2012-2015 GizMoCuz
2016-01-20 07:01:02.474 Build Hash: 9eef872, Date: 2015-11-01 11:41:18
2016-01-20 07:01:02.475 System: Raspberry Pi
2016-01-20 07:01:02.475 Startup Path: /home/pi/domoticz/
2016-01-20 07:01:02.850 Sunrise: 08:32:00 SunSet:16:57:00
2016-01-20 07:01:02.850 EventSystem: reset all events...
2016-01-20 07:01:02.904 Active notification subsystems: (0/10)
2016-01-20 07:01:03.062 Webserver started on port: 8080
2016-01-20 07:01:03.117 Webserver started on port: 443
2016-01-20 07:01:03.143 Started shared server on: 0.0.0.0
2016-01-20 07:01:05.148 EventSystem: reset all events...
2016-01-20 07:01:05.149 EventSystem: reset all device statuses...
2016-01-20 07:01:05.151 EventSystem: Started
2016-01-20 07:01:06.148 MySensors: Using serial port: /dev/ttyUSB0
2016-01-20 07:01:07.627 MySensors: Gateway Ready...
2016-01-20 07:01:07.703 MySensors: Gateway Version: 1.5
2016-01-20 07:02:01.877 (Arduino_Gateway) Humidity (Unknown)
2016-01-20 07:02:21.109 (Arduino_Gateway) General/Barometer (Barometer)
2016-01-20 07:02:33.803 Incoming connection from: 192.168.2.104
2016-01-20 07:02:34.397 (Arduino_Gateway) Humidity (Unknown)
2016-01-20 07:03:26.039 (Arduino_Gateway) General/Barometer (Barometer)
2016-01-20 07:03:34.371 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:03:39.421 (Arduino_Gateway) Humidity (Unknown)
2016-01-20 07:04:06.690 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:04:30.971 (Arduino_Gateway) General/Barometer (Barometer)
2016-01-20 07:05:05.811 MySensors: Node: 4, Sketch Name: Light Sensor
2016-01-20 07:05:05.822 MySensors: Node: 4, Sketch Version: 1.0
2016-01-20 07:05:05.837 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:05:38.195 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:06:10.553 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:06:42.911 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:07:15.274 (Arduino_Gateway) Lux (Windmeter)
2016-01-20 07:08:02.692 MySensors: Node: 4, Sketch Version: 1.0
2016-01-20 07:08:11.010 MySensors: Node: 4, Sketch Name: Light Sensor
2016-01-20 07:08:11.017 MySensors: Node: 4, Sketch Version: 1.0
2016-01-20 07:08:50.713 (Arduino_Gateway) General/Barometer (Barometer)
2016-01-20 07:09:36.974 (Arduino_Gateway) Humidity (Unknown)
2016-01-20 07:09:55.656 (Arduino_Gateway) General/Barometer (Barometer)

[sundberg84]

Ah... in your code it doesnt send if its the same value as before - can this be your problem (you dont have any wind today?) So since the value is zero all the time you wont get any new values?

if (lightLevel != lastLightLevel){ 

Also, sensors are not shown in Domoticz until the first value is recieved.

[JohanRC]

@sundberg84
No unfortunatly this is not the problem, the setup is still on my kitchen table so i can "produce wind with my finger" :)

The thing is when I leave the V and S values to "Light" it transfers the data without any problems you can aslo see this in the log file between 07:05 and 07:06.
But when I change it to WIND there is no transfer of data anymore, I can see by the TX light on my Arduino nano that it is sending info.

[sundberg84]

@JOhanRC And when you changed to Vind you added the new node in devices in Domoticz?
It will not update the last node but create a new if you change the presentation.

[mfalkvidd]

But when I change it to WIND there is no transfer of data anymore, I can see by the TX light on my Arduino nano that it is sending info.

That's strange. Could you post your new sketch?

[JohanRC]

@sundberg84
This might be a good tip, I did not add any new node in Domoticz but I waited until would appear automaticly, this ofcourse did not happen. So I need to find out how to manually add a new node in Domoticz. (I am only a 3 days old baby regarding to Domoticz:smile: )

@mfalkvidd
My latest sketch is the one I last posted in post 8.

Already thanks for all the input I am not there yet but I think were getting close :)
When finished I think it would perhaps be a good idea to post the code as an example so more people can have the benefits of it.

Greetz Johan

[mfalkvidd]

ok. The changes between the two sketches look fine. What pops out is that you use pin 0 which is shared with the serial port on some Arduinos but as long as you're not using the serial port that should be fine and the code is the same in both sketches anyway.

How about disabling the read and sending a fixed value instead, to eliminate reading problems?

or add lots of Serial.println statements.

[flopp]

You divide the value from analog sensor by 31.605 why?
Edit: 1023/31.605=32.366. To get 32,4m/s?
I should try to use map instead.
https://www.arduino.cc/en/Reference/Map

If you receive 1v that will give you 200/31.605=~7

[flopp]

This is from the link you posted

Wind speed values (output voltage -0.4) /1.6 * 32.4
Eg. Receive ~6m/s (1-0.4)/1.6*32.4=0.6/51.84=0.0115
I don't understand what that means or did I calculate wrong?

Have you measured the output voltage when you push the sensor?

[A Former User]

You got the wrong formula. This formula is for the sensor which output voltage is 0.4v by 0 m/s and 2.0v by 32.4 m/s

If your windsensor is for 0-5v then use this:

outVoltage = analogRead(A0) * (5.0 /1023.0) 
speed = (outVoltage / 5) * 32.4

[JohanRC]

My current code that is not sending info is:

#include <SPI.h>
#include <MySensor.h>  

#define CHILD_ID_WIND 1
#define WIND_SENSOR_ANALOG_PIN 1

unsigned long SLEEP_TIME = 10000; // Sleep time between reads (in milliseconds)

MySensor gw;
MyMessage msg(CHILD_ID_WIND, V_WIND);
float lastWindLevel;

void setup()  
{ 
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Wind Sensor", "2.0");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_WIND, S_WIND);
}

void loop()      
{     
  float windLevel = (analogRead(WIND_SENSOR_ANALOG_PIN))/31.605; 
  Serial.println(windLevel);
  if (windLevel != lastWindLevel) {
      gw.send(msg.set(windLevel, 1));
      lastWindLevel = windLevel;
  }
  gw.sleep(SLEEP_TIME);
}

The code that is sending data (in lux) is:

#include <SPI.h>
#include <MySensor.h>  

#define CHILD_ID_WIND 1
#define WIND_SENSOR_ANALOG_PIN 1

unsigned long SLEEP_TIME = 10000; // Sleep time between reads (in milliseconds)

MySensor gw;
MyMessage msg(CHILD_ID_WIND, V_LIGHT_LEVEL);
float lastWindLevel;

void setup()  
{ 
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Wind Sensor", "2.0");

  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_WIND, S_LIGHT_LEVEL);
}

void loop()      
{     
  float windLevel = (analogRead(WIND_SENSOR_ANALOG_PIN))/31.605; 
  Serial.println(windLevel);
  if (windLevel != lastWindLevel) {
      gw.send(msg.set(windLevel, 1));
      lastWindLevel = windLevel;
  }
  gw.sleep(SLEEP_TIME);
}

I dont really see why my formula is wrong, my sensor output is 0V to 5V in wind ranging from 0m/s to 32,4ms.
This means when I have 5V on the input sensor (32,4m/s) I will measure a value of 1023 when I devide this through 31,605 I will read a value of 32,368 m/s
I have made it a float and rounded it to one decimal, so I dont realy see the problem here (please correct me if I am wrong)

I am more and more suspecting that there might be something going on on the Domoticz side.

[JohanRC]

@kenci
Ah I checked the manufacturers data again and now see what you mean :)
I will change this, thanx!