Need help-MG811 co2 sensor module- sandbox electronics

Projects General Guidance
1

Hi,

I have been trying to connect the MG811 CO2 sensor module with Arduino Uno. I used the following datasheet:
http://sandboxelectronics.com/?p=147

I have connected the Vout to pin A0 and For the BOOL pin, I connected a 10 K pullup resistor and connected to Pin A2. Ground pin is connected to ground. I am using external 9V power supply for the heater.
When I run the code provided, it doesnt work.
Can somebody help me?

Thanks
Zubeida

2

What didn't work? The module, the arduino, the upload, or serial communication? Did you you get any error messages?

3

I am getting continuous output on the serial monitor that BOOL IS HIGH, CO2 CONCENTRATION is -18436, and SEN-00007 is 0.00 V :frowning: