Description

DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and outputs 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.

Features

• Operating voltage : 3 – 5V
• Operating current : 2.5mA during conversion
• Relative humidity range : 0-100%RH
• Accuracy : ±2%RH
• Resolution : ±0.1%RH
• No more than 0.5 Hz sampling rate (once every 2 seconds)
• Dimensions :  15.5 x 12 x 5.5 mm
• 4 pins with 0.1″ spacing

Wiring

Files & Documentation

• Datasheet – DHT22
• Tutorial with code : How to Use DHT-22 Sensor – Arduino Tutorial – Instructables
• Complete Guide for DHT11/DHT22 Humidity and Temperature Sensor With Arduino – RandomNerdTutorials