2Pcs Natural Coal Co Methane Detector Arduino MQ-4 MQ4 Methane Gas Sensor New xy
3,58 €
The main chip: LM393. ZYMQ-4 gas sensor. Dual signal output (analog output, and TTL level output). TTL output signal is low. You can enjoy top-quality product and high-quality services from us. Indication of the signal output.
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