DHT22 Module

Description
The DHT22 is an affordable digital sensor designed to measure temperature and humidity. It uses a capacitive sensor for humidity and a thermistor for temperature, outputting data digitally through a single data pin—no analog input required. While it’s easy to use, precise timing is necessary to read the data correctly.

 Key Features

• Core Component: AOSONG AM2302 high-precision temperature and humidity sensor
• Outputs digital data via a single-wire, bidirectional serial interface
• Includes a mounting hole for easy installation and secure placement
• Temperature detection range: -40°C to 80°C, with ±0.5°C accuracy
• Humidity detection range: 0% to 100% RH, with ±2% RH accuracy

Technical Specifications

• Operates on 3V to 5V for both power and signal
• Consumes up to 2.5mA during data conversion
• Measures humidity from 0% to 100% with an accuracy of 2–5%
• Measures temperature from -40°C to 80°C with ±0.5°C accuracy
• Sampling rate limited to once every 2 seconds (0.5 Hz max)
• Compact design: 27mm × 59mm × 13.5mm (1.05″ × 2.32″ × 0.53″)
• Features 4 pins with 0.1″ spacing
• Sensor weight: 2.4 grams

Applications

• Environmental Monitoring:The DHT22 can be used to monitor temperature and humidity in various environments, providing valuable data for research, analysis, and decision-making.
• Weather Stations: DHT22 is commonly used in DIY weather stations to measure local temperature and humidity, contributing to a more accurate understanding of weather patterns.
• Home Automation: The DHT22 can be integrated into home automation systems to control heating, ventilation, and air conditioning based on real-time environmental conditions.
• Prototyping and Educational Projects: The DHT22 is a versatile and affordable sensor that is frequently used in prototyping and educational projects to teach students about sensor technology and data acquisition. .
• Agriculture: In agriculture, the DHT22 can be used to monitor greenhouse conditions, irrigate crops based on real-time data, and improve plant growth.

Datasheet:

For detailed technical information, refer to the link below for the DHT22 datasheet

https://www.alldatasheet.com/datasheet-pdf/view/1132459/ETC2/DHT22.html