Waveshare DHT22 (AM2302) Digital Temperature & Humidity Sensor Module

Name: Waveshare DHT22 (AM2302) Digital Temperature &amp; Humidity Sensor Module
Brand: Waveshare
SKU: SENS-3463
Price: 939.00 INR
Availability: OutOfStock

₹939.00 (Inclusive of all taxes)

Out of Stock

The Waveshare DHT22 (AM2302) module is a calibrated digital sensor for high-accuracy ambient temperature and humidity monitoring. It features a capacitive sensing element and a thermistor, outputting a digital signal via a single-wire interface compatible with 3.3V or 5V microcontrollers like Arduino, Raspberry Pi, and ESP32.

Features

High-precision capacitive humidity sensor with ±2% RH accuracy (typical)
Integrated thermistor for temperature sensing with ±0.5°C accuracy
Wide operating range: -40°C to 80°C and 0% to 99.9% RH
Calibrated digital signal output via single-wire serial interface
Low power consumption and stable long-term performance

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Description

The Waveshare DHT22 module integrates the AM2302 sensor, offering improved accuracy and a broader measurement range compared to the DHT11. It utilizes a capacitive polymer element for humidity sensing and a precision thermistor for temperature measurement. The onboard IC handles signal conditioning and outputs fully calibrated digital data.

This sensor communicates via a proprietary single-wire serial protocol, simplifying connection to microcontrollers without requiring analog input pins. It is designed for reliable environmental monitoring in applications ranging from HVAC systems and weather stations to agricultural and industrial control systems, providing stable readings across its full specified range.

Key Features

High-accuracy digital temperature and humidity sensor module
Features the AM2302 (DHT22) capacitive sensing element
Full-range temperature compensated for reliable humidity readings
Calibrated digital output ensures immediate usability
Single-wire serial interface simplifies wiring and integration
Wide operating voltage range from 3.3V to 5.5V DC
Compact form factor for easy integration into projects and enclosures
Provides outstanding long-term stability and repeatability

Applications

Indoor climate monitoring and HVAC system control
Weather station and environmental data logging
Agricultural greenhouse humidity and temperature control
Server room and equipment cabinet environmental monitoring
Home automation and smart thermostat systems

Technical Specifications

Model / Sensor	DHT22 (AM2302)
Temperature Range	-40°C to 80°C
Temperature Accuracy	±0.5°C
Temperature Resolution	0.1°C
Humidity Range	0% RH to 99.9% RH
Humidity Accuracy	±2% RH (typical at 25°C)
Humidity Resolution	0.1% RH
Operating Voltage	3.3V to 5.5V DC
Output Interface	Single-Wire Digital Serial
Dimensions (L x W)	40 mm x 15 mm
Weight	5 g

Frequently Asked Questions

What is the operating voltage range for the Waveshare DHT22 module?

The DHT22 module operates from 3.3V to 5.5V DC, making it directly compatible with both 3.3V logic systems (like Raspberry Pi, ESP32) and standard 5V Arduino boards. Ensure your power supply is stable within this range for accurate readings.

How do I connect and read data from the DHT22 sensor?

Connect the module's VCC pin to 3.3V or 5V, GND to ground, and the data pin to a digital I/O pin on your microcontroller. Use a library (like DHTlib for Arduino) to handle the proprietary single-wire serial protocol. Note, each sensor requires its own dedicated data pin.

What is the difference between DHT22 and DHT11 sensors?

The DHT22 (AM2302) offers higher accuracy and a wider measurement range than the DHT11. It measures humidity from 0-99.9% RH (±2%) and temperature from -40°C to 80°C (±0.5°C), compared to the DHT11's 20-80% RH (±5%) and 0-50°C (±2°C) range.

Is the DHT22 sensor's digital output calibrated?

Yes, the AM2302 sensor is factory calibrated. The onboard IC outputs a fully calibrated digital signal for both temperature and humidity, eliminating the need for user calibration and ensuring consistent, interchangeable performance between modules.