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MQ4 Gas Sensor
The MQ4 methane gas sensor is a MOS (metal oxide semiconductor) type sensor that detects methane gas concentration in the air at home or in the workplace and gives an analog voltage output when read.
More specs:https://www.utmel.com/components/how-to-use-mq4-gas-sensor?id=821

1. MQ4 Gas Sensor

MQ4 Gas Sensor
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