Product Details:DHT22 Humidity and Temprature sensor
| Accuracy | humidity +/- 2 % RH (Max +/- 5 % RH) , |
| Model | DHT22 |
| Sensor Length (millimetre) | small size 14 x 18 x 5.5 mm; big size 22 x 28 x 5 mm |
| Humidity sensor | Polymer humidity capacitor |
| Temperature sensor | Thermistor |
| Supply voltage | 3.3 to 5.5V DC |
| Operating range | humidity 0 to-100 % RH , temperature - 40 to 80 deg Celsius |
| Output signal | digital signal via 1- wire bus |
| Resolution or sensitivity | humidity 0.1% RH ; temperature 0.1 Celsius |
| Repeatability | humidity +/- 1% RH; temperature +/- 0.2 Celsius |
| Sensing period | Average: 2 s |
DHT22 also referred to as AM2302 capacitive humidity sensing digital temperature and humidity module is one that contains the compound that has been calibrated digital signal output of the temperature and humidity sensors. Application of a fanatical digital modules collection technology and therefore the temperature and humidity sensing technology, to make sure that the merchandise has high reliability and excellent long-term stability.
The sensor includes a capacitive sensor wet components and high-precision temperature measurement devices and connected with a high-performance 8-bit microcontroller. The product has the superb quality, fast response, strong anti-jamming capability, and high cost.
Standard single-bus interface, system integration quick and easy. Small size, low power consumption, signal transmission distance up to 20 meters, making it the best choice of all kinds of applications and even the most demanding applications.
DHT22 has higher precision and may replace the expensive imported SHT10 temperature and humidity sensor.
It can measure the environment temperature and humidity to satisfy the high demand. The product has high reliability and good stability. If it's used and combined with a special sensor Arduino expansion board, it will be easily implemented the interactive effect related to the temperature and humidity perception.
Caution: DHT22 digital temperature and humidity sensor is meant for analog sensor interfaces. The analog port will be used as the digital which will not occupy the original digital port of the Arduino. The lines of the sensor can transform the analogue function to digital that can be used on a digital port.
Every sensor of this model is temperature compensated and calibrated in an accurate calibration chamber and the calibration-coefficient is saved in the type of program in OTP memory, when the sensor is detecting, it'll cite coefficient from memory. Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of harsh application occasions. Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the rightmost pin to ground. Although it uses a single-wire to send data it's not Dallas One Wire compatible! If you would like multiple sensors, all must have its own data pin!
