MQ3 METHYL ETHANOL SENSOR MODULE

The MQ3 Alcohol/Ethanol Gas Sensor Module detects alcohol vapour concentration in air. Provides both analog voltage output and digital TTL output (active LOW). Threshold for digital output set via onboard potentiometer. No external components required — directly connects to any MCU, Arduino, or Raspberry Pi.

Specifications:

• Target Gas: Alcohol (ethanol/methanol vapour)
• Detection Range: 0.05–10mg/L alcohol
• Supply Voltage: 5V
• Current: 150mA
• Digital Output: TTL active LOW
• Load Resistance: 200kΩ
• Operating Temperature: -10 to +70°C

Applications:

• Breathalyser and alcohol detection projects
• Vehicle ignition interlock systems
• Industrial ethanol vapour monitoring
• Arduino/ESP32 alcohol sensing