The AM2302 is a wired version of the DHT22, in a large plastic body. It 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 red 3-5V power, the yellow wire to your data input pin and the black wire 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

There is a 5.1K resistor inside the sensor connecting VCC and DATA so you do not need any additional pullup resistors

  • 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")
  • 3 wires 23cm long (9")
  • 27mm wide x 58.75mm tall x 13.30mm deep

Downloads:

Detailed usage tutorial

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!
Connect sensors to Xively with Arduino & the CC3000 WiFi chip!
Build a wireless temperature & humidity sensor using the BlueFruit module!
Send weather measurements data to the cloud using the power of the Arduino Yun!
Visualise data measurements inside an online Adafruit IO dashboard
Build a simple home automation system & control it from anywhere!

(AF-393)

SKU AF-393
Brand Adafruit

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