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The DHT22 is a accurate digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and outputs a digital signal on the data pin (no analog input pins needed). Its fairly simple to use sensor which can deliver new data once every 2 seconds.
Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the right most pin to ground.
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