DHT22 Digital Temperature & Humidity Sensor: An Overview
The DHT22 Digital Temperature & Humidity Sensor is a versatile sensor capable of measuring both temperature and humidity with high accuracy and reliability. It utilizes a capacitive humidity sensor and a thermistor to measure the surrounding air, and an integrated circuit converts the sensor readings to digital signals. The sensor provides real-time data with excellent long-term stability and low power consumption, making it suitable for various applications, including weather stations, HVAC systems, and environmental monitoring.
Specifications:
| Feature | Specification |
|---|---|
| Model | DHT22 |
| Operating Voltage | 3.3V – 6V |
| Temperature Range | -40°C to +80°C |
| Humidity Range | 0% to 100% RH |
| Temperature Accuracy | ±0.5°C |
| Humidity Accuracy | ±2% RH (max ±5% RH) |
| Resolution | Temperature: 0.1°C, Humidity: 0.1% RH |
| Sampling Rate | 0.5 Hz (2 seconds) |
| Interface | Digital (Single-Wire Bi-Directional) |
| Dimensions | 15.1mm x 25mm x 7.7mm |
| Applications | Weather stations, HVAC systems, environmental monitoring |
Features:
- High accuracy and reliability in temperature and humidity measurement.
- Wide operating voltage range from 3.3V to 6V.
- Wide measurement range: -40°C to +80°C for temperature and 0% to 100% RH for humidity.
- Excellent long-term stability and low power consumption.
- Digital output for easy interfacing with microcontrollers.
- Fast response time with a sampling rate of 0.5 Hz.
- Compact size for easy integration into various applications.
- Single-wire bi-directional interface for simple communication.
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