Waveshare MQ-3 Gas Sensor

Overview 1. Sensitive for alcohol, ethanol 2. Output voltage boosts along with the concentration of the measured gases increases 3. Fast response and recovery 4. Adjustable sensitivity 5. Signal output indicator Specifications 1. Power: 2.5V ~ 5.0V 2. Dimension: 40.0mm * 21.0mm 3. Mounting holes size: 2.0mm Applications 1. Car alcohol alarm 2. Breathalyser How to Use In the case of working with a MCU: 1. VCC: 2.5V ~ 5.0V 2. GND: Power supply ground 3. AOUT: MCU.IO (analog output) 4. DOUT: MCU.IO (digital output) Package Contents 1. MQ-3 Gas Sensor x1 2. 4-pin custom connector jumper wire x1