This repository has been archived by the owner on Dec 28, 2018. It is now read-only.
DHT22
welcome aboard > kit > sensors > dht22 temperature-humidity sensor
- 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
- https://www.adafruit.com/product/385
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! 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.
Comes with a 4.7K - 10K resistor, which you will want to use as a pullup from the data pin to VCC.
src: adafruit.com
| guide | url |
|---|---|
| Adafruit: DHT22 Datasheet | https://cdn-shop.adafruit.com/datasheets/DHT22.pdf |
| Adafruit: DHT Sensor Overview | https://learn.adafruit.com/dht/overview |
| How to Use DHT-22 Sensor - Arduino Tutorial | http://www.instructables.com/id/How-to-use-DHT-22-sensor-Arduino-Tutorial/ |