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The Gas Sensor is a sensor which detects gas and smoke with concentration between 300ppm and 10000ppm.
He can detect butane, propane, methane, alcohol, hydrogen and smoke. He can be only used Inside, at ambient temperature.
He has 2 pins for the power, 1 pin for the analogic value and 1 pin for the digital value. For this project, we'll use the analogic pin.
Arduino --> Sensor
5V --> VCC
GND --> GND
A0 --> A0
+ Green Led --> D13
+ Red Led --> D12