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The DHT22 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the
surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful
timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our
library, sensor readings can be up to 2 seconds old.
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. Although it
uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin!
We have written an Arduino library with example code
Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and
more expensive
Comes with a 4.7K - 10K resistor, which you will want to use as a pullup from the data pin to VCC.
Downloads:
Arduino library and example code
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