Carbon Monoxide Sensor - MQ-7
Do you want a Carbon Monoxide Sensor? This sensor is very useful since it is easy to use and perfectly does the job of measuring CO concentrations through the air as long as it is between this range: 20 to 2000ppm.
In addition to that, the response time of it is fast! It is very sensitive, just power 5V to the heater coil and after adding the resistance, you’ll have to connect the output and ADC.