9Pcs MQ2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 MQ-135 Gas Sensor Module
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Product Details
VCC: Connect to the positive 5V of the power supply GND: connect to the negative pole of the power supply DO: TTL switch signal output AO: analog signal output MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 MQ-135 Smoke Detection liquefied methane Gas Sensor Module for Arduino (9pcs)