This alcohol gas sensor detects the concentration of alcohol gas in the air and ouputs its reading as an analog voltage. The concentration sensing range of 0.04 mg/L to 4 mg/L is suitable for breathalysers (the legal limit of breath alcohol concentration, or BrAC, in most US 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 150 mA at 5 V. Please read the MQ3 datasheet (153k pdf) for more information about the sensor.
Connecting five volts across the heating (H) pins keeps the sensor hot enough to function correctly. Connecting five volts at either the A or B pins causes the sensor to emit an analog voltage on the other pins. A resistive load between the output pins and ground sets the sensitivity of the detector. Please note: that the picture in the datasheet for the top configuration is wrong. Both configurations have the same pinout consistent with the bottom configuration.The resistive load should be calibrated for your particular application using the equations in the datasheet, but a good starting value for the resistor is 200 kO.
We offer a Pololu breakout board that makes it easier to interface with these sensors.
Note: These sensors could have orange or blue plastic cases. There is no functional difference between the two colored cases.
This carrier board is designed to work with any of the MQ-series "gas sensors".
This semiconductor gas sensor detects the presence of methane (CNG) gas at concentrations from 300 ppm to 10,000 ppm, a range suitable for detecting gas leaks.
This prebuilt 4WD wheeled robot platform is equipped with 32mm motors, a motor controller, and Spektrum remote control. This pre-built is an customized version of TP-132-032.
This is a prebuilt custom robot ready to ship. It uses our popular LT2-F chassis with 8ft Zippermast to make surveillance possible from 8 foot high.