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The MQ7 is an easy-to-use carbon monoxide (CO) sensor that is suitable for detecting CO concentrations in the air. It can detect CO gas concentrations from 20 to 2000 ppm. >The output of the sensor is an analog resistor. The driver circuit is very simple; all you have to do is supply the heating coil with 5V, add a load resistor and connect the output to an ADC.
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