Guides for product: DHT22 temperature-humidity sensor + extras

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 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.

Basic temperature & humidity sensors
DHT11, DHT22 and AM2302 Sensors
98
Beginner
Humidity and Temperature Logging From Your Pi or Beaglebone Black to the Cloud!
DHT Humidity Sensing on Raspberry Pi or Beaglebone Black with GDocs Logging
39
Intermediate
Make a WiFi-connected weather station using Arduino & the CC3000 WiFi chip!
WiFi Weather Station
53
Intermediate
Monitor temperature and humidity on an LCD display with this compact Trinket-based project
Trinket Temperature & Humidity LCD Display
33
Beginner
Connect sensors to Xively with Arduino & the CC3000 WiFi chip!
Adafruit CC3000 WiFi and Xively
1
Beginner
Build a wireless temperature & humidity sensor using the BlueFruit module!
Bluetooth Temperature & Humidity Sensor
20
Intermediate
Send weather measurements data to the cloud using the power of the Arduino Yun!
Cloud-Connected Weather Station with the Arduino Yun & Temboo
38
Advanced
Visualise data measurements inside an online Adafruit IO dashboard
Create an Internet of Things Dashboard with Adafruit IO
66
Beginner
Using the ESP8266 as a microcontroller as well as a low cost wifi server.
ESP8266 Temperature / Humidity Webserver
100
Beginner
Build a simple home automation system & control it from anywhere!
Home Automation in the Cloud with the ESP8266 & Adafruit IO
151
Beginner
Find the ideal conditions for a good nights rest
Schluff - The Sleep Monitor
21
Intermediate
Monitor temperature & humidity from anywhere!
Adafruit IO Basics: Temperature & Humidity
83
Intermediate
Get connected to The Things Network by building a small weather node using a Feather M0 LoRa
Using LoraWAN and The Things Network with Feather
21
Intermediate