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SALE: DHT22 Temperature & Humidity Sensor (AM2302)


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Price:
£1.19 (inc VAT) £0.99 (exc VAT)
SKU:
DHT22
Weight:
10.00 Grams
Shipping:
Calculated at checkout


DHT22 Temperature & Humidity Sensor (AM2302)

 

Single wire digital interface. The sensor is calibrated and only requires a single 4.8K-10K pull-up resistor on the dataline. 

 

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

 

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

 

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

 

Technical 

  • 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

 

Documentation 

OpenEnergyMonitor Example Sketches

Nathen Chantrell Example Sketch for ATtiny84

Nathen Chantrell blog post

Post on hooking up DHT22 to Arduino

 

Datasheet

 

Arduino Library 

https://github.com/nathanchantrell/Arduino-DHT22

https://github.com/adafruit/DHT-sensor-library

 


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