CO click detects Carbon monoxide, the gas you can't see, smell or taste, but must avoid.
CO click has a MQ-7 "sniffing" sensor, similar to the one on Alcohol click that we released yesterday. The sensing layer is made of Tin dioxide (SnO2), an inorganic compound whose conductivity increases when the levels of Carbon monoxide rise.
The sensor detects Carbon monoxide concentration levels in the range of 20-2000ppm. To put it in perspective, a person can experience headache and dizziness within a few hours of exposure to 35ppm levels. Levels above 1600ppm can be fatal in less than two hours.
Use the on-board potentiometer to calibrate the sensor for the environment you’ll be using it in. For precise calibration the sensor needs to preheat itself (once powered up, it takes 48h to reach the right temperature). To get accurate measurements, you'll have to consider the ambient temperature and humidity levels when calibrating the sensor. Note that even with a rougher calibration the sensor will still be able to detect changes in CO levels.