DHT22 Temperature and Humidity Sensor Module

Product Overview

The DHT22/AM2302 Temperature and Humidity Sensor Module is a reliable digital sensor that delivers accurate environmental readings for a wide range of projects. Engineered for both hobbyists and professionals, this module pairs a capacitive humidity sensor with a precision thermistor to provide stable temperature and humidity measurements suitable for home automation, weather stations, industrial monitoring, and agricultural systems.

Key Features

• Dual sensing: Measures temperature and humidity from a single compact module.
• High accuracy: Temperature accuracy ±0.5°C; humidity accuracy ±2-5% RH.
• Wide ranges: Temperature: -40°C to 80°C; Humidity: 0% to 100% RH.
• Digital output: Single-wire communication protocol for straightforward interfacing.
• Low power consumption: Suitable for battery-powered and remote applications.
• Fast response and stability: Quick sensing for dynamic environments and long-term measurement stability.
• Compact form factor: Small size for easy integration into enclosures and PCBs.
• Wide operating voltage: 3.3V to 5.5V compatible with common microcontrollers.

Technical Specifications

• Sensor type: Capacitive humidity sensor and thermistor.
• Output type: Digital signal via single-wire communication protocol.
• Temperature range: -40°C to 80°C.
• Temperature accuracy: ±0.5°C.
• Humidity range: 0% to 100% RH.
• Humidity accuracy: ±2-5% RH.
• Operating voltage: 3.3V to 5.5V.
• Dimensions and weight: Compact and lightweight for versatile mounting.

Applications

• Home automation and indoor climate control
• Personal or community weather stations
• HVAC monitoring and control systems
• Agricultural environments and greenhouse automation
• Industrial monitoring and storage condition tracking
• Battery-powered IoT and remote sensing projects

Integration and Compatibility

The DHT22/AM2302 communicates using a simple single-wire digital protocol, making it easy to connect to microcontrollers and development boards such as Arduino, ESP8266, ESP32, and Raspberry Pi. Many libraries and code examples exist to simplify setup and data reading.

Wiring basics

• Power: 3.3V to 5.5V to VCC
• Ground: Connect to common ground
• Data: Single digital pin with pull-up resistor (often 4.7k to 10k)

Software and libraries

• Arduino: DHT sensor libraries (examples available in Library Manager)
• Raspberry Pi: Python libraries for GPIO and DHT sensors
• ESP modules: Compatible with common IoT firmware and libraries

Tips for Best Results

• Allow the sensor to acclimate to the environment before taking critical readings.
• Use a pull-up resistor on the data line for reliable communication.
• Protect the sensor from direct water exposure; it is not waterproof.
• Place the sensor away from heating elements or direct sunlight for accurate ambient readings.
• For long-term deployments, perform occasional checks against a calibrated reference if high precision is required.

Why Choose the DHT22/AM2302?

The DHT22/AM2302 offers a balance of affordability, accuracy, and ease of use. Its wide operating range, digital output, and low power consumption make it a practical option for embedded systems, IoT devices, and environmental monitoring projects where reliable temperature and humidity data are required.

Additional Notes

Images are for illustration purposes only.