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DHT22 temperature-humidity sensor
- SKU: ADA385
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). It's 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 rightmost 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.
- 3 to 5V power and I/O
- 2.5mA max current use during conversion (while requesting data)
- Good for 0-100% humidity readings with 2-5% accuracy
- Good for -40 to 80°C temperature readings ±0.5°C accuracy
- No more than 0.5 Hz sampling rate (once every 2 seconds)
- Body size 27mm x 59mm x 13.5mm (1.05" x 2.32" x 0.53")
- 4 pins, 0.1" spacing
- Weight (just the DHT22): 2.4g