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MQ3 MQ-3 Gas Sensor Module alcohol ethanol detection

K-TECHNICS
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KSh350.00

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The MQ-3 Gas Sensor Module is a low-cost, semiconductor-based sensor specialized for detecting alcohol (ethanol) vapor in the air. It functions primarily as a breathalyzer component, utilizing a Tin Dioxide (\(SnO_{2}\)) sensing element that changes electrical resistance based on gas concentration.Ā šŸ› ļø Key Technical Specifications
  • Operating Voltage: 5V DC.
  • Current Consumption: ~150 mA (due to internal heater).
  • Detection Range: 0.04 mg/L to 4 mg/L (approximately 25 to 500 ppm).
  • Output Signal Type: Dual output (Analog and Digital TTL).
šŸ”Œ Module Pinout Configuration
The sensor break-out board typically features 4 output interface pins:
  • VCC: Connects to the 5V power supply line of the microcontroller.
  • GND: Connects to the system common ground.
  • DO (Digital Output): Emits a TTL digital signal (HIGH/LOW). Trigger threshold is adjusted manually via the onboard potentiometer.
  • AO (Analog Output): Outputs a continuous voltage gradient ranging from 0.1V to 4V. The voltage increases linearly relative to the detected ethanol concentration.Ā 

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