DHT22 Digital-output relative humidity & temperature sensor/module
DHT22 also named as AM2302
Feature & Application:
- Full range temperature compensated
- Relative humidity and temperature measurement
- Calibrated digital signal
- Outstanding long-term stability
- Extra components not needed
- Long transmission distance
- Low power consumption
- 4 pins packaged and fully interchangeable
Description
DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity
sensing technology, assuring its reliability and stability.Its sensing elements is connected with 8-bit single-chip
computer.
Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the
calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite
coefficient from memory.
Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of
harsh application occasions.
Single-row packaged with four pins, making the connection very convenient.
Technical Specification:
| Model |
DHT22 |
| Power supply |
3.3-6V DC |
| Output signal |
digital signal via single-bus |
| Sensing element |
Polymer capacitor |
| Operating range |
humidity 0-100%RH;
temperature -40~80Celsius |
| Accuracy |
humidity +-2%RH(Max +-5%RH);
temperature <+-0.5Celsius |
| Resolution or sensitivity |
humidity 0.1%RH;
temperature 0.1Celsius |
| Repeatability |
humidity +-1%RH;
temperature +-0.2Celsius |
| Humidity |
hysteresis +-0.3%RH |
| Long-term Stability |
+-0.5%RH/year |
| Sensing period |
Average: 2s |
| Interchangeability |
fully interchangeable |
| Dimensions |
small size 14*18*5.5mm; big size 22*28*5mm |
Document:
DHT22.pdf