Description
The DHT22 is an affordable digital sensor for measuring temperature and relative humidity. It employs a capacitive humidity sensor and a thermistor for temperature sensing, outputting calibrated digital data through a single data pin requiring no analog input. While straightforward to use, precise timing is necessary to correctly read the data stream. The sensor is commonly sold in a small PCB module with a built-in mounting hole.
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
Specification
- 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
Applications
- Environmental monitoring: Track temperature and humidity in various environments for research, analysis, and decision-making
- Weather stations: Commonly used in DIY weather stations to measure local conditions and contribute to weather pattern understanding
- Home automation: Integrate into automation systems to control heating, ventilation, and air conditioning (HVAC) based on real-time data
- Prototyping and education: A versatile, affordable sensor for teaching sensor technology and data acquisition concepts
- Agriculture: Monitor greenhouse conditions, optimize irrigation schedules, and improve plant growth with real-time environmental data