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.
- Out the digital output for easy alcohol detection
- Get serious and use an ADC to play with the analog output.
- Input voltage: 5 +/- 0.2V
- DOUT: Digital signal output
- LED lights on when detected gas
- AOUT: analog signal output, the output is the analog value of detected voltage
- GND: Power supply negative pole;
- Dimensions: 1.22 in x 0.71 in x 1.06 in (3.1 cm x 1.8 cm x 2.7 cm)
- The main chip: LM393, MQ-3 gas sensor
- Current consumption = 150mA
- 1 X MQ-3 Gas Sensor