Generic DHT22 AM2302 Digital Temperature & Humidity Sensor Module

Name: Generic DHT22 AM2302 Digital Temperature &amp; Humidity Sensor Module
Brand: Generic
SKU: SENS-3482
Price: 105.00 INR
Availability: OutOfStock

₹105.00 (Inclusive of all taxes)

Out of Stock

The DHT22 (AM2302) is a calibrated digital temperature and humidity sensor module compatible with 3.3V and 5V logic systems like Arduino, Raspberry Pi, ESP32, and STM32. It provides a single-wire digital output for reliable environmental monitoring.

Features

Wide measurement range: -40°C to 80°C temperature & 0-100% RH humidity.
High accuracy: ±0.5°C temperature & ±2% RH humidity (typical at 25°C).
Digital single-wire serial interface simplifies connection to microcontrollers.
Integrated capacitive humidity sensor and thermistor with full temperature compensation.
Low power consumption and excellent long-term stability.

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Description

The DHT22 (AM2302) module combines a capacitive polymer humidity sensor and an NTC thermistor to deliver calibrated digital readings of ambient temperature and relative humidity. It features an onboard 8-bit microcontroller that handles sensor signal conditioning and outputs a serial digital signal, eliminating the need for external analog-to-digital converters.

Designed for stable, long-term operation, the sensor includes full-range temperature compensation for accurate humidity readings across its entire operating range. Its single-bus digital interface requires precise timing but simplifies wiring, making it a staple for DIY electronics, environmental monitoring systems, and HVAC prototyping.

Key Features

Calibrated Digital Output: Provides direct, calibrated digital readings via a single-wire serial interface.
High-Accuracy Sensing: Delivers temperature readings with ±0.5°C accuracy and humidity with ±2% RH accuracy under typical conditions.
Wide Operating Range: Functions reliably from -40°C to 80°C and 0% to 100% relative humidity.
Excellent Long-Term Stability: Features low annual drift (<1°C/year for temperature, <1% RH/year for humidity) for consistent performance.
Integrated Signal Conditioning: Onboard processing chip outputs a clean, digital signal, requiring no extra components.
Optimized Performance-to-Cost Ratio: A high-value build offering reliable sensing for a wide range of applications.

Applications

Indoor climate monitoring and data logging for HVAC system prototyping.
Environmental sensing in DIY electronics projects using Arduino or Raspberry Pi.
Greenhouse and indoor farming humidity and temperature control systems.
Basic weather station and home automation sensor nodes.
Asset condition monitoring in storage or transport environments.

Technical Specifications

Model Number	AM2302 (DHT22)
Supply Voltage	3.3V to 5.5V DC
Temperature Range	-40°C to 80°C
Temperature Accuracy	±0.5°C (typical at 25°C)
Temperature Resolution	0.1°C
Humidity Range	0% to 100% RH
Humidity Accuracy	±2% RH (typical, 10-90% RH at 25°C)
Humidity Resolution	0.1% RH
Output Interface	Single-Wire Digital Serial
Sampling Rate	0.5 Hz (one reading every 2 seconds)
Operating Current	<2.5 mA (during measurement)
Dimensions (L x W)	43 mm x 15 mm
Weight	7 g

Frequently Asked Questions

What is the operating voltage range for the DHT22 module?

The DHT22 (AM2302) module operates from 3.3V to 5.5V DC. It is compatible with both 3.3V and 5V logic microcontroller platforms like Arduino, ESP32, and Raspberry Pi (using appropriate logic level shifting if necessary).

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

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

What is the maximum sampling rate for the DHT22?

The DHT22 has a maximum sampling rate of 0.5 Hz, meaning you can request a new measurement once every 2 seconds. Polling the sensor more frequently may return old data or cause communication errors.

Is the DHT22 sensor accurate over its full temperature and humidity range?

Yes, the sensor features full-range temperature compensation for its capacitive humidity element, maintaining specified accuracy across the -40°C to 80°C operating range. Typical accuracy is ±0.5°C for temperature and ±2% RH for humidity (under standard conditions).

Can I use this sensor outdoors or in harsh environments?

While the DHT22 has a wide operating range, the module itself is not waterproof or specifically hardened for harsh outdoor use. For outdoor applications, it requires a protective enclosure to shield it from direct moisture, condensation, and UV exposure.