MP-2 Air Quality Detection Gas Sensor Module - Analog Output

The MP-2 module requires two separate voltage inputs. The internal heater requires 5.0V AC or DC. The sensor circuit itself operates on a separate supply of ≤10V DC. It is critical to provide both for proper sensor function and to avoid damage.

Connect the module's analog output pin to an analog input (ADC) pin on the Arduino (e.g., A0). Provide the separate 5V heater supply and the ≤10V circuit voltage as specified. The Arduino can then read the varying analog voltage, which corresponds to the detected gas concentration.

The MP-2 is a broad-spectrum metal oxide semiconductor (MOS) sensor primarily sensitive to combustible gases such as smoke, propane, and similar hydrocarbons. It is designed for general air quality and combustible gas detection within its 200ppm to 10,000ppm range, not for identifying specific gas types.

For qualitative detection and relative concentration changes, calibration may not be strictly necessary. For quantitative measurements, a baseline calibration in clean air is recommended, and periodic recalibration may be required as sensor sensitivity can drift over time and with environmental conditions.

The adjustable load resistor (RL) forms a voltage divider with the sensor's variable resistance (Rs). Adjusting RL allows you to tune the sensitivity and output voltage range of the analog signal to better match the input range of your microcontroller's ADC, optimizing measurement resolution.