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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 0.04mg/L to 4mg/L is suitable for breathalysers (the legal limit of breath alcohol concentration, or BrAC, in most US states is 0.08grams per 210liters, or 0.38mg/L). The sensor can operate at temperatures from -10 to 50deg;C and consumes less than 150mA at 5V. Please read the MQ3 datasheet (153k pdf) for more information about the sensor.
Gas sensor with orange plastic case bottom view.
Connections
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 200kOmega;.
We offer two breakout boards that make it easier to interface with these sensors: a Pololu carrier board and a SparkFun carrier board. The Pololu version is shown below.
Pololu MQ gas sensor carrier with sensitivity-setting resistor soldered in the vertical orientation.
Note: These sensors could have orange or blue plastic cases. There is no functional difference between the two colored cases.
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Informazioni aziendali
ROBOT DOMESTICI SRL - Via Cornelio Labeone, 70 - 00174 Roma (RM)
Partita IVA IT15791431008 - REA di Roma n. RM 1614298
CODICE FATTURAZIONE ELETTRONICA: KRRH6B9
Tel. (+39) 06 76971136 | e-mail: info@robot-domestici.it