#define MQ2_PIN A0 // Analog pin for MQ2 sensor #define MQ3_PIN A1 // Analog pin for MQ3 sensor #define MQ7_PIN A2 // Analog pin for MQ7 sensor #define VOLTAGE_REFERENCE 5.0 // Voltage reference (in ...
In principle, MQ-Series Sensors have internal sensor resistor Rs and an external load resistor RL forms a voltage divider. The sensor resistor varies depending on the type of gas it measures, and its ...
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