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 |
Pinout:
| Pin | Description |
|---|---|
| VCC | Power Supply |
| DATA | Digital Data Output |
| GND | Ground |
Applications:
- Home Automation and Smart Home Devices.
- Personal Weather Stations.
- HVAC (Heating, Ventilation & Air Conditioning) Systems.
- Indoor Air Quality Monitoring.
- Environmental Data Logging.
Package Contents:
- 1x DHT22 Digital Temperature and Humidity Sensor.
- 3x Female To Female Wire.