Manushre Manas Enterprises MQ-3 High Sensitivity Alcohol Detector Sensor Module for Arduino Electronic Components Electronic Hobby Kit

It has four pins, and is extremely easy to use. What makes this listing so unique is that it has an analog output pin that you can interface with an analog to digital converter, and a digital output that is supplied from a comparator output. The digital output is normally high. When you blow into the sensor the output will swing from 5v (1) to 0v (0). You can calibrate this digital output to swing the on-board variable resistor. You can calibrate the output to swing after you’ve had one beer, two beers, etc. Sensitivity adjustable the blue digital potentiometer adjustment. Before the use of the operating voltage 5V power supply at least warm-up for more than two minutes, the sensor slightly hot is normal. Analog voltage output. Digital switching outputs (0 and 1) With fixed bolt hole for easy installation Small board PCB size: 4.5cm * 1.8cm. 1 VCC Operating voltage 5V DC. 2 GND to connect GND. 3 D0 Small board digital switch output interfaces (0 and 1) 4 A0 Small board analog output interface.Gas leakage monitoring device can be used in homes and factories, and is suitable for the detection of alcohol.