These sensors are highly sensitive and provide fast updates once the initial warm up period has completed. Each sensor features an analog output that varies in proportion to the concentration of smoke or gas. The higher the concentration detected, the higher the output voltage on pin A0.

The sensors also provide a digital output capability based on a pre-determined set point. This set point is adjusted using the onboard trimmer potentiometer. Once the A0 signal level reaches this set point, the digital output will be triggered high.

Please note: these are relative output sensors, and the voltage output does not represent a defined concentration. These are best used for detecting a change in concentration.