DFRobot Fermion MEMS Gas Sensor MiCS-5524 Breakout Module - Analog Output

The MiCS-5524 MEMS gas sensor requires a tightly regulated supply voltage between 4.9V and 5.1V DC for proper operation and accurate readings. Powering it outside this range may damage the sensor or produce unreliable analog output signals. Ensure your power source, such as a Arduino 5V pin or a regulated bench supply, provides a stable 5.0V.

Connect the module's VCC to 5V, GND to ground, and the analog output (AO) pin to an analog input pin (e.g., A0 on Arduino). The sensor outputs a voltage that varies with gas concentration. Use the provided sample code and concentration conversion formulas specific to each target gas (like CO or H2) to calculate the ppm value from the ADC reading on your microcontroller.

The sensor requires an initial calibration in clean air to establish a baseline reading. For precise quantitative measurements, calibration against known gas concentrations is recommended. The MEMS element has a specified life cycle of over 2 years when operated continuously in normal air, after which sensitivity may gradually decrease and recalibration may be necessary.

The MiCS-5524 is sensitive to a broad spectrum of gases including CO, CH4, H2, NO, NO2, NH3, and various alcohols and hydrocarbons. It is not highly selective; its resistance changes in the presence of any of these reducing gases. For applications requiring identification of a specific gas, additional sensor arrays or filtering algorithms are often used alongside this module.