DHT22 Digital Temperature and Humidity Sensor Module

DHT22 Digital Temperature and Humidity Sensor Module

The DHT22 (also known as AM2302) is a calibrated digital temperature and humidity sensor mounted on a convenient breakout module. It outputs both readings over a single-wire digital interface, so you only need one GPIO pin to read the environment. Compared with the DHT11, the DHT22 offers a wider measurement range and better accuracy — making it a great choice for weather stations, IoT and environmental monitoring.

Features

• Measures both temperature and relative humidity
• Single-wire digital output — uses just one GPIO pin
• Factory-calibrated for accurate readings
• Breakout module with onboard pull-up resistor
• Wide range and higher accuracy than the DHT11
• Works with Arduino, ESP32, ESP8266 and Raspberry Pi

Specifications

• Sensor: DHT22 / AM2302
• Humidity range: 0–100% RH (±2% accuracy)
• Temperature range: -40°C to +80°C (±0.5°C accuracy)
• Interface: Single-wire digital
• Operating voltage: 3.3V – 5V
• Sampling rate: Up to once every 2 seconds

Applications

• Weather stations and environmental monitoring
• IoT temperature/humidity logging
• HVAC, greenhouse and incubator control
• DIY and educational electronics projects

Package Includes

• 1 x DHT22 Temperature and Humidity Sensor Module

Frequently Asked Questions

How is it better than the DHT11?
Wider range and higher accuracy — 0–100% RH and −40 to +80°C versus the DHT11’s narrower band.

How many pins do I need?
Just one data pin (single-wire digital), plus power and ground.

How often can I read it?
About once every 2 seconds.

Recommended Pairings

Works great with our ESP32-S3 board and Arduino Nano. Learn more about humidity sensing.