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MQ 3 Gas Sensor Module For Benzine, CH4, Hexane, LPG, CO Detector Module RC522 RFID 13.56MHZ Reader Writer Module Complete starter kit package eliminating Complete starter kit package eliminating separate procurement of power supply You will need to purchase a microSD card (16GB or higher recommended) When target gas molecules come in contact with the heated sensing surface The onboard LM393 comparator converts this into a clean digital signal (DO pin) based on the potentiometer set threshold
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