MQ-137 DC 5V Ammonia Detection NH3 Gas Sensor Module Analog + TTL Level Output
16,47 €
Main chip: LM393, NH3 gas sensor probe. It has high sensitivity and selectivity to ammonia;. Dual signal output (analog output and TTL level output);. TTL output effective signal is low level; (the signal light is on when the output is low level, and can be connected to the MCU IO port).
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