Air Contaminants Sensor

AR_39 · **Joined:** Tue Aug 02, 2011 10:05 am **Posts:** 29

Hi,

after applying TGS2602 sensor configuration, the result is 0.000000. Why is this?
Below is the simple code to help me know what happens.

void setup(){

//setup for Serial port
USB.begin();
SensorGas.setBoardMode(SENS_ON);
SensorGas.configureSensor(SENS_SOCKET2A, 1, 10);
SensorGas.setSensorMode(SENS_ON, SENS_SOCKET2A);

}

void sendmsg(){

double airpolution=0;
delay (35000);
airpolution=SensorGas.readValue(SENS_SOCKET2A);
USB.print("Air Polution: ");
USB.println(airpolution);
delay (1000);

}

void loop(){

RTC.ON();
Utils.setLED(LED0,LED_OFF);

USB.println("---------------Data----------------");

delay(1000);

sendmsg();

delay (1000);

}

And the results are:

---------------Data----------------
Air Polution: 0.0000000000
---------------Data----------------
Air Polution: 0.0000000000
---------------Data----------------
Air Polution: 0.0000000000
---------------Data----------------
Air Polution: 0.0000000000
---------------Data----------------
Air Polution: 0.0000000000
---------------Data----------------
Air Polution: 0.0000000000

Thanks.
Ana.

libelium-dev · **Joined:** Mon Sep 28, 2009 1:06 pm **Posts:** 7516

Hi AR_39,

we have been testing your code here in Libelium and it works pretty well, you only should place the RTC.ON() just after turning on the sensor board, in the setup, or may there be some trouble in the configuration (though this is not the cause of your reading). Usually, the most likely cause of this is a wrong connection. Could you post a picture of how is your sensor connected to your board?

Regards.

AR_39 · **Joined:** Tue Aug 02, 2011 10:05 am **Posts:** 29

I can not post the picture.

I have the cables according to specifications, into the socket2A, VCC (5V) on the two pins left, and RL and GND on the two pins on the right.

I changed RTC.ON(), but I get the same results.

AmroQuandour · **Posted:** Thu Sep 01, 2011 3:19 pm

Test this code and post your results: -

Code:

void setup()
{
  
  USB.begin();
  
  SensorGas.setBoardMode(SENS_ON);
  
  SensorGas.configureSensor(SENS_SOCKET2A,1,1);
  
  SensorGas.setSensorMode(SENS_ON, SENS_SOCKET2A); 
  
}

void loop() 
{
  USB.println("----------------------------------------");
   
  delay(30000);
  
  float Air1 = SensorGas.readValue(SENS_SOCKET2A) ; 
  
  USB.print("Air = "); USB.println(Air1);
  
  USB.println("----------------------------------------");

}

AR_39 · **Joined:** Tue Aug 02, 2011 10:05 am **Posts:** 29

No, the results are the same. I tried another identical sensor and another plate Waspmote to check that it is hardware failure. And the results are the same in both cases. Please, help me.

Air = 0.0000000000
----------------------------------------
----------------------------------------
Air = 0.0000000000
----------------------------------------
----------------------------------------
Air = 0.0000000000
----------------------------------------
----------------------------------------
Air = 0.0000000000
----------------------------------------
----------------------------------------

libelium-dev · **Joined:** Mon Sep 28, 2009 1:06 pm **Posts:** 7516

Hi AR_39,

thanks for your help, AmroQuandour, but we tested her code here in Libelium and it works fine, so it is not a matter of software.

Did you try another gas sensor board?

Also, regarding the position of the sensor, are you sure you placed the sensor pin as pointed in the picture of page 24 of the technical guide?

Regards.