This alcohol gas sensor measures the concentration of alcohol gas in the air and outputs its measured value as analog voltage. The concentration measurement range from 0.04 mg/L to 4 mg/L is suitable for alcohol testers (the legal limit for breath alcohol concentration or BrAC in most states is 0.08 grams per 210 liters or 0.38 mg/L). The sensor can operate at temperatures from -10 to 50°C and consumes less than 150mA at 5V. Please read the MQ3 data sheet (153k pdf) for more information about the sensor.
>Connecting five volts via the heater pins (H) keeps the sensor hot enough to function properly. Connecting five volts to either the A or B pins causes the sensor to output an analog voltage to the other pins. A resistive load between the output pins and ground adjusts the sensitivity of the detector. Please note that the picture in the data sheet for the top configuration is incorrect. Both configurations have the same assignment that matches the lower configuration. The resistive load should be calibrated for your particular application using the equations in the data sheet, but a good starting value for the resistance is 200 kΩ.
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