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air quality sensor

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robbert:
I have an air quality sensor but don't know how to wire it.
Can somebody help me.??
I got also the technical data in the jpeg.
Thanks,

Robbert

barragan:
hi Robbert, from the diagram seems 1 goes to 3.3v, 2 goes to 3.3v, 3 goes to the analog input pin and 4 goes to ground. RL is a pull down resistor (a resistor going from the pin 3 to ground, try it without the resistor and see what values you get. You could use the photoresistor example code to try: http://wiring.org.co/learning/basics/photoresistor.html

Let me know.

robbert:
Sorry for the late response.  i'll try it now and i let you know.
Thanks,
Robbert

robbert:
the only thing i get out of it are numbers that are not very differet even with smoke in the sensor.  like 654  655  678 etc.
 :-\

barragan:
could you try different values for RL? 1K or 10K

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