The MQ-3 alcohol sensor detects the presence of alcohol gas in a range suitable for alcohol meters (0.04 mg/L to 4 mg/L). Like other MQ sensors, it provides an analog voltage output proportional to the gas concentration. It is capable of detecting alcohol gas levels commonly used in alcohol measurement devices.
By applying 5V to the H pins, the sensor heats up sufficiently, ensuring accurate and reliable measurements.
Applying 5V to the A or B pins allows the sensor to output analog voltage through its other pins. The sensor’s sensitivity can be adjusted by the resistor value connected between the sensor output pin and ground. This value can vary depending on your application; calculations and guidelines are provided in the datasheet. A typical starting value is 200 kΩ.
Specifications:
- Operating Temperature: -10° to 50°C
- Operating Voltage: 5V
- Current Consumption: 150 mA
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