DHT22 temperature-humidity sensor + extras

PRODUCT ID: 385
$9.95
QTY DISCOUNT
1-9 $9.95
10-99 $8.96
100+ $7.96

Description

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.

We have an Adafruit Learning System guide with schematics, Arduino & CircuitPython code, datasheets, and more!

Compared to the DHT11, this sensor is more precise, more accurate, and works in a bigger range of temperature/humidity, but it's 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.

https://www.youtube.com/embed/wv6eX3DOp2c?start=566

Technical Details

  • Low cost
  • 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

Adafruit Learning System guide has schematics, code, datasheets and more!

RoHS 2 2011 65 EU Compliant
RoHS 2 2015 863 EU Compliant

Learn

Basic temperature & humidity sensors
Humidity and Temperature Logging From Your Pi or Beaglebone Black to the Cloud!
Make a WiFi-connected weather station using Arduino & the CC3000 WiFi chip!
Monitor temperature and humidity on an LCD display with this compact Trinket-based project
SEE ALL GUIDES