Connection of co2 sensor | Microcontroller › Arduino › co2 Sensor connection with arduino › Connection of co2 sensor August 23, 2015 at 8:45 am #13209 Prabakaran P MParticipant Hi subash, Connect 1, 3 and 5 pins to the ground. Connect vheat to 5v to enable the heating of sensor. 6 and 4 pins are the output pins of the sensor which can be connected through lm324 op amp circuit to the analogue pin of the arduino.
