MQ-3 alcohol sensor module for ethanol gas detection with alarm for Arduino.

Using high-quality dual-panel design, with power indicator and TTL signal output instructions.

The switching signal features a DO (TTL) output and an analog output AO.

• TTL output valid signal is low (Low-level signal when the output light can be directly connected to the microcontroller or relay module).
• Analog output voltage increases with higher concentration.
• Four screw holes for easy positioning.
• Long life and reliable stability.
• Rapid response and recovery characteristic.

Specifications:

• Input voltage: DC5V
• Power consumption (current): 150mA
• DO output: TTL digital 0 and 1 (0.1 and 5V)
• AO output: 0.1-0.3V (relative to pollution), maximum concentration voltage of about 4V

Special Note: After the sensor is powered, it needs to warm up for around 20 seconds. Measured data will then be stable. Sensor heat is a normal phenomenon due to the internal heating wire. If it's *not* hot, that would be abnormal.

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