DHT22 / AM2302 Digital Temperature and Humidity Sensor
The DHT22 digital temperature and humidity sensor manufactured by Aosong is designed for accurate environmental monitoring in embedded and IoT systems. It integrates a polymer capacitor humidity sensing element and a temperature sensing component with calibrated digital output.
The sensor communicates through a single bus digital interface and provides stable measurements with high resolution. It is widely used in weather stations, HVAC monitoring, smart home systems, and development projects using Arduino / ESP32 / Raspberry Pi platforms.
Key Features
- High accuracy digital temperature and humidity sensor
- Manufactured by Aosong
- Single bus digital communication interface
- Polymer capacitor humidity sensing element
- High resolution measurement output
- Stable long term performance
- Compatible with Arduino / ESP32 / Raspberry Pi platforms
Specifications
- Brand = Aosong
- Power Supply = 3.3V to 6V DC
- Humidity Measurement Range = 0 percent RH to 100 percent RH
- Temperature Measurement Range = -40 C to 80 C
- Humidity Resolution = 0.1 percent RH
- Temperature Resolution = 0.1 C
- Humidity Accuracy = 2 percent RH typical 5 percent RH max
- Temperature Accuracy = 0.5 C typical
- Humidity Repeatability = 1 percent RH
- Temperature Repeatability = 0.2 C
- Humidity Hysteresis = 0.3 percent RH
- Long Term Stability = 0.5 percent RH per year
- Sensing Element = Polymer capacitor
- Sampling Period = 2 s average
- Output Signal = Single bus digital signal
Interfaces
- VCC = Power supply input
- DATA = Digital data output
- GND = Ground
