DHT22 Digital Temperature and Humidity Sensor Module AM2302

Description

1. Sensor Type: The DHT22 is a digital sensor that combines temperature and humidity sensing capabilities in a single package.
2. Measurement Range:
   • Temperature Range: Typically, it can measure temperatures from -40°C to 80°C (-40°F to 176°F).
   • Humidity Range: It can measure relative humidity in the range of 0% to 100%.
3. Accuracy:
   • Temperature Accuracy: Generally within ±0.5°C (±0.9°F).
   • Humidity Accuracy: Typically within ±2% RH (relative humidity).
4. Digital Output: The sensor provides digital output, which can be easily read by microcontrollers.
5. Communication Protocol: It uses a proprietary single-wire communication protocol to transmit data to the microcontroller.
6. Calibrated: DHT22 sensors are factory calibrated, so there’s no need for additional calibration in most applications.
7. Sampling Rate: The sensor may have a sampling rate of once every 2 seconds for temperature and humidity measurements.
8. Operating Voltage: Typically operates at 3.3V or 5V DC, making it compatible with a wide range of microcontrollers and development boards.
9. Connector: It often comes with a 3-pin connector, including VCC (power supply), GND (ground), and data (digital signal).
10. Wiring: Connecting the sensor is relatively straightforward, as it requires just three wires for power and data.
11. Protection: Some DHT22 modules come with a built-in 10K ohm pull-up resistor to help with signal stability.
12. Response Time: It has a relatively fast response time, and you can typically read data from it within a few milliseconds after requesting a measurement.
13. Applications: Commonly used in weather stations, environmental monitoring systems, home automation projects, and various applications where temperature and humidity data is important.
14. Library Support: Several libraries and code examples are available for different microcontroller platforms, making it easy to interface with and read data from the DHT22 sensor.
15. Integration: The DHT22 can be easily integrated into microcontroller-based projects like Arduino, Raspberry Pi, and other embedded systems.