Ozone Air Quality Sensor Breakout Board
This sensor is excellent for detecting certain molecules, specifically, O3 (TriOxygen) or formally known as Ozone. The breakout board features a potentiometer along with 4 male jumper pins. The sensor runs on 5VDC and can output both digital TTL signal and Analog signal. The analogue signal can be amplified with the potentiometer for your liking.
Resources: http://playground.arduino.cc/Main/MQGasSensors
Open Arduino IDE > Examples > Basic > AnalogReadSerial
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