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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.
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An Infrared (IR) Obstacle Avoidance Module is a compact, low-cost sensor that uses infrared light to detect nearby objects.It is a popular for DIY electronics and robotics projects
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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.
