Overview

DHT22 is a Temperature & Humidity Sensor features a temperature & humidity sensor complex with a calibrated digital signal output. By using the excluesive digital-signal-acquisition technique and temperature & humidity sensing technology, it ensures high reliability and excellent long-term stability.

This sensor includes a resistive-type humidity measurement component and an NTC temperature measurement component, and connects to a high-performance 8-bit microcontroller, offering excellent quality, fast response, anti-interference ability and cost-effectiveness.

Compare to DHT11, DHT22 is a little more accurate and good over a slightly larger range.

Features

• Operating voltage : +3.3 ~ +6V

• Measurement for humidity : 0 ~ 100% RH 2-5% accuracy

• Measurement for temperature : -40 ~ 80°C ±0.5°C

• Communication : Single-wire serial bus

Pin Definition

• PIN #1 : VCC (3.3 ~ 6VDC)

• PIN #2 : DATA

• PIN #3 : NC (not connect)

• PIN #4 : GND (Ground)

Typical application