Monitor LPG, propane or hydrogen with this MQ-2 gas sensor from Waveshare! Note: Please do not use this sensor for critical home/industrial/commercial gas sensing applications. Intended for development and learning/hobby purposes only. Features Sensitive for LPG, propane, hydrogen Output voltage boosts along with the concentration of the measured gases increases Fast response and recovery Features boost circuit Adjustable sensitivity Signal output indicator Sensor only – no cable Specifications Power: 2.5V ~ 5.0V Dimension: 40.0mm * 21.0mm Mounting holes size: 2.0mm Resources Product Wiki When working with an MCU: VCC 2.5V ~ 5.0V GND power supply ground AOUT MCU.IO (analog output) DOUT MCU.IO (digital output) Package Contents 1xMQ-2 Gas Sensor 1×4-pin custom connector jumper wire