Thanks, it seems like that was actually the case, now that I switched the RX and TX wires, I am able to get some plausible output from the sensor. Does anyone know by the way what type of the 7 pin connector is? it seems to be as JST connector, but not with the standard 2.54 pitch spacing. Edit: Fig...

I recently received my MH-Z14a sensor, I want to use it to send CO2 values to my home automation system via MQTT. When I got it, I first hooked it up to a arduino nano and the PWM example form this site: http://domoticx.com/arduino-co2-sensor-mh-z14/ It seemed to work, The red light was flashing eve...