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MQ-6 Gas Sensor - LPG, Butane & Propane
This is a simple-to-use liquefied petroleum gas (LPG)sensor, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm.
This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
Datasheet:
https://cdn.sparkfun.com/datasheets/Sensors/Biometric/MQ-6%20Ver1.3%20-%20Manual.pdf
Wiring example:
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