DHT22 Humidity/Temperature Sensor:

Here are some key features and specifications of the DHT22 humidity sensor:

1. Type: The DHT22 is a digital humidity and temperature sensor.
2. Sensing Elements: The sensor uses a capacitive humidity sensing element and a thermistor for temperature measurement.
3. Measurement Range:
   • Humidity: 0% to 100% RH (Relative Humidity)
   • Temperature: -40°C to 80°C
4. Accuracy:
   • Humidity: ±2% RH
   • Temperature: ±0.5°C
5. Resolution:
   • Humidity: 0.1% RH
   • Temperature: 0.1°C
6. Response Time:
   • The sensor has a fast response time, typically within 2 seconds.
7. Sampling Rate: The recommended sampling rate for reading data from the DHT22 is once every 2 seconds.
8. Communication Protocol: The DHT22 uses a single-wire digital communication protocol for sending data to a microcontroller or other devices. It typically requires a pull-up resistor on the data line.
9. Power Supply: The sensor operates on a supply voltage between 3.3V and 5V.
10. Current Consumption: The operating current during a measurement is typically around 2.5 mA.
11. Long-term Stability: The DHT22 is designed for long-term stability, but calibration may be necessary over extended periods.
12. Calibration: The sensor may need occasional calibration to maintain accurate measurements.
13. Housing: The sensor is often enclosed in a protective housing to shield it from environmental factors and contaminants.
14. Compatibility: The DHT22 is widely used and compatible with various microcontrollers, including Arduino, Raspberry Pi, and other platforms. Libraries and sample code are available for easy integration.
15. Applications: The DHT22 is commonly used in applications such as weather stations, environmental monitoring systems, HVAC control, and other projects where accurate humidity and temperature measurements are required.