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MQ-3 gas sensor detect alcohol When the sensor is present in the environment alcohol vapor,the sensor's conductivity increases with the concentration of alcohol gas in the air.
MQ2 is a very easy to use low cost semiconductor Gas sensor Module with analog and digital output.This module uses MQ2 Smoke & Flammable gas sensor as a gas sensing element.
IR Sensor_ Infrared Obstacle Avoidance Module
The DHT22 is a low cost digital temperature and humidity sensor with a single wire digital interface.It can uses to measure the surrounding air.
5-Channel Flame Detector Module
