DHT22 High-Precision Single-Bus Digital Temperature & Humidity Sensor Module (AM2302 Compatible)

Description

The DHT22 High-Precision Module is a ready-to-use breakout board built around the DHT22/AM2302 digital temperature and humidity sensor. It combines a capacitive humidity sensing element and an NTC thermistor with an integrated 8-bit microcontroller that performs analog-to-digital conversion and outputs a calibrated digital signal over a single-wire interface. Compared to the DHT11, the DHT22 offers a significantly wider measurement range (-40°C to 80°C, 0–100% RH) and higher accuracy (±0.5°C, ±2% RH), making it suitable for applications where reliable environmental data matters. The module integrates the required pull-up resistor on the data line, simplifying wiring for Arduino, Raspberry Pi, ESP32, and other microcontroller platforms. It is well-suited for individual makers building weather stations or home automation projects, as well as business purchasers seeking a dependable sensing solution for environmental monitoring, HVAC diagnostics, greenhouse control, and educational deployments .

Features

• Factory-Calibrated Digital Output: Individually calibrated with coefficients stored onboard; no user calibration is required .

• High Accuracy and Wide Range: Measures -40°C to 80°C with ±0.5°C accuracy and 0–100% RH with ±2% RH accuracy .

• Integrated Pull-Up Resistor: The module includes the necessary pull-up on the data line, eliminating external components for most applications .

• Single-Bus Digital Interface: Communicates over one data pin, conserving GPIO resources for other peripherals .

• 3.3V to 5.5V Compatibility: Works directly with both 3.3V logic systems (ESP32, Raspberry Pi) and 5V systems (Arduino Uno) .

• 0.1°C / 0.1% RH Resolution: Provides fine-grained readings suitable for precise environmental tracking .

Technical Specifications