SKU: SEN0132
The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000ppm. The sensitivity can be adjusted by the potentiometer.
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FAQ
I am confused why both the SN-MQ7 and SN-MQ9 sensors' pin2-VCC and pin3-GND are interconnected ? Can someone help me?
You could check the schematic.If you don't power it, the resistance value between H sides will be very small, which you could almost ignore it directly, But once it gets a power, you could measure it with a multimeter, It will change.
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