Description: This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO concentrations anywhere from 20 to 2000ppm.
This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
This gas sensor can be used with the Gas Sensor Breakout, simplifying the interface from 6 to 3 pins-ground, power and analog voltage output-that are broken out with a 0.1" spacing. This board has two mounting holes and provides convenient pads for mounting the gas sensor's required sensitivity-setting resistor.
Pololu MQ gas sensor carrier with sensitivity-setting resistor
soldered in the horizontal/vertical orientation.