DHT22 Digital Temperature and Humidity Sensor Module
DHT22 overview
The DHT22 Digital Temperature and Humidity Sensor Module AM2302 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins are needed). AM2302 Sensing Module is fairly simple to use but requires careful timing to grab data.
The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our library, sensor readings can be up to 2 seconds old. The Temp and Humidity sensor DHT22 can measure temperature from -40°C to 80°C and humidity from 0% to 100% with an accuracy of ±1°C and ±1%. So if you are looking to measure in this range then this sensor might be the right choice for you.
Key specifications
Datasheet
DHT22 features
- High precision
- Capacitive type
- Full range temperature compensated
- Relative humidity and temperature measurement
- Calibrated digital signal
- Outstanding long-term stability
- Extra components are not needed
- Long transmission distance
- Low power consumption
- 4 pins packaged and fully interchangeable
DHT22 pinout
| Name | Description |
|---|---|
| VCC | Power supply 3.5V to 5.5V |
| Data | Outputs both Temperature and Humidity through serial Data |
| Ground | Connected to the ground of the circuit |
DHT22 applications
- Climate monitoring: The DHT22 Digital Temperature and Humidity Sensor Module is commonly used in climate monitoring applications. It provides accurate measurements of temperature and humidity, allowing for precise monitoring of environmental conditions.
- Weather forecasting: The sensor module can be integrated into weather stations and weather forecasting systems. It contributes to the collection of real-time temperature and humidity data, which is crucial for predicting weather patterns and changes.
- Agriculture and horticulture: The DHT22 sensor module finds applications in agriculture and horticulture. It helps in monitoring and controlling temperature and humidity levels in greenhouses, enabling optimal growing conditions for crops and plants.
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