Tags: DHT22, Temperature, Humidity, , Sensor

DHT22 Temperature Humidity Sensor

  • 19.00 AED
    • Ex Tax:19.00 AED
    • Product Code:
    • Availability: In Stock
    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 cali..
    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 a 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

    DHT22 temperature and humidity sensor



    Intro

    The DHT11/DHT22 is a quite popular sensor in the maker scene. It's a temperature and humidity sensor.
    Easy-to-use, quite accurate and also affordable. If you're looking for examples of self made weather stations, you'll find that many makers use exactly this sensor. There are many different temperature sensors on the market. But only few, cheap humidity sensors.

    Wiring

    Code

     I didn't develop any code for this. Since, when you search for DHT in the Library Manager and install a fitting library, you can load an example and it will work. (see video).

    Video


    1-Wire bus

    While searching the internet I found several different datasheets to this sensor and many different tutorials to this sensor and how to implement a pullup resistor to this. So I tested different configuration myself. And I found out that the sensor would even work without any resistors. The sensor using the 1-Wire bus. So I would recommend using a resistor. About the correct value I'm unsure. But it seems everything between 1kOhm and 10kOhm will work just fine.

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