DHT22 Digital Temperature and Humidity Sensor
The DHT22 is a popular, low-cost digital sensor for measuring relative humidity and temperature. It uses a capacitive humidity sensor and a thermistor, which are connected to an internal 8-bit single-chip computer to output a calibrated digital signal.
Features
- Dual Function: Measures both relative humidity and temperature in one package.
- Calibrated Digital Output: Provides a fully calibrated digital signal.
- High Accuracy: Delivers precise measurements with an accuracy of 0.5°C for temperature and 2%RH for humidity.
- Wide Measurement Range: Capable of measuring temperatures from -40°C to 80°C and humidity from 0% to 100% RH.
- Excellent Long-Term Stability: Highly stable with low drift, rated at 0.5%RH per year.
- Long Transmission Distance: The digital signal can be reliably transmitted over a distance of up to 20 meters.
- Low Power Consumption: Efficient design ideal for battery-powered applications.
Specifications
| Parameter | Value |
|---|---|
| Model | DHT22 |
| Power Supply | 3.3V – 6V DC |
| Output Signal | Digital signal via single-bus |
| Sensing Element | Polymer Capacitor |
| Operating Range (Humidity) | 0 – 100% RH |
| Accuracy (Humidity) | ±2% RH (Max ±5% RH) |
| Resolution (Humidity) | 0.1% RH |
| Operating Range (Temp) | -40°C to 80°C |
| Accuracy (Temp) | <±0.5°C |
| Resolution (Temp) | 0.1°C |
| Repeatability | ±1% RH / ±0.2°C |
| Long-Term Stability | ±0.5% RH / year |
| Sensing Period (Average) | 2 seconds |
| Dimensions | 25.1mm x 15.1mm x 7.7mm |
Applications
- Home Automation and Smart Home Devices
- Personal Weather Stations
- HVAC (Heating, Ventilation & Air Conditioning) Systems
- Indoor Air Quality Monitoring
- Environmental Data Logging
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