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Question How Can Rpi3B+ Detect MQ9 Gas Sensor's Carbon Monoxide Leakage, Without Using ADC? Answer Understanding MQ9's Digital and Analog signals MQ9 has both a Digital and an Analog output signal, as summarized below: (a) Digital - To detect gas leakage or no leakage, outputting High level 4.8V, or Low, 0.2V, respectively. (b) Analog - ...

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