JOY-IT MQ3V2 Alcohol Gas Sensor Module (MQ3V2)

The JOY-IT MQ3V2 stands out as a dedicated alcohol detection module built around the proven MQ-3 semiconductor sensing element. Unlike generic gas sensors, it focuses on ethanol with high sensitivity and a wide detection range from 10 to 1000 ppm, making it ideal for breathalyser projects, safety monitoring, and educational experiments. The module delivers both analog and digital outputs, allowing flexible integration with microcontrollers like Arduino or Raspberry Pi.

Highlights

• High sensitivity to alcohol (ethanol) with detection range of 10–1000 ppm
• Dual output: analog (0–5V) for precise measurement and digital (TTL) for threshold-based triggering
• Onboard potentiometer to adjust digital output sensitivity threshold
• Fast response time ≤10 s and recovery time ≤30 s
• Stable long-term performance with wide operating temperature range (-10°C to 50°C)
• Simple 4-pin interface: VCC, GND, DOUT, AOUT

In daily use

Connect the module to a 5V supply and read the analog output for continuous alcohol concentration monitoring, or use the digital output with a set threshold for simple alarm circuits. The compact design and standard 4-pin header make it easy to integrate into existing projects. The heating element requires a warm-up time, so allow a few minutes for stable readings. The onboard potentiometer allows fine-tuning of the digital trigger level without external components.

Full specifications

• Sensor type: Semiconductor gas sensor (MQ-3)
• Target gas: Alcohol (Ethanol)
• Detection range: 10–1000 ppm (0.05–10 mg/L)
• Operating voltage: 5V DC
• Heating voltage: 5V DC
• Heating current: <150 mA
• Output: Analog (0–5V) and digital (TTL)
• Response time: ≤10 s
• Recovery time: ≤30 s
• Operating temperature: -10°C to 50°C
• Operating humidity: ≤95% RH
• Pin configuration: VCC, GND, DOUT, AOUT
• Adjustable sensitivity: Yes (onboard potentiometer)
• Interface: 4-pin header

Final note

The JOY-IT MQ3V2 is a reliable choice for alcohol sensing applications, offering both precision and simplicity in a compact module. Its dual output and adjustable threshold make it versatile for hobbyists and professionals alike.