Has anyone worked with Prallax CO2 sensor kit (includes the amplifier) http://www.robotshop.com/parallax-co2-gas-sensor-module-2.html
I’m trying to wire it up but not sure if my approach is right. see attached a picture of my wiring,
So since the sensor needs more power i am using an external of 9V and sharing the sensor’s GND with Arduino GND
then I’m reading both pins CNTL and ALR as analog-ins
I have a feeling I am missing something here.
any comments or advice would be appreciated!