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Features:Good sensitivity to CO/Combustible gas* High sensitivity to Methane, Propane and CO* Long life and low cost* Simple drive circuitConnection here are the connections for my sensorArduino Gas Sensor5V VCCGND GNDNC DOUTAnalog A0 AOUTCode:void setup() { Serial.begin(9600);} void loop() { float sensorVoltage; float sensorValue; sensorValue = analogRead(A0); sensorVoltage = sensorValue/1024*5.0; Serial.print("sensor voltage = "); Serial.print(sensorVoltage); Serial.println(" V"); delay(1000);}Results:Again look at the serial monitor, you need to let the sensor stabilise. Remember it consists of a heating element, so you effectively have to let the sensor ‘heat up’.Sensor voltage = 0.40Vsensor voltage = 0.40Vsensor voltage = 0.40Vsensor voltage = 0.42Vsensor voltage = 0.41Vsensor voltage = 0.41Vsensor voltage = 0.41Vsensor voltage = 0.41Vsensor voltage = 0.40 V