DHT22 Temperature and Humidity Sensor DHT22 is a digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and provides digital output on the data pin (no analog input pin required). It is easy to use, but requires attention to data processing. The data can be read once every 2 seconds. Technical Specifications: • Reduced cost; • Supply voltage: 3 V - 5 V; • Current: 2.5 MA (when data is processed); • Good for humidity 0 - 100% with 2-5% accuracy; • Good for -40 ° C + 80 ° C with ± 0.5 ° C accuracy; • Response time: 2 seconds; • Dimensions: 27 mm x 59 mm x 13.5 mm. Instructions for use: 1.Make the necessary hardware connections. The connection diagram is as follows: • Pin 1 connects to the 5 V or 3.3 V pin of the development board. • Pin 2 connects to a digital pin. • Pin 4 connects to a GND pin of the development board. The sensor does not include a pull-up resistor, so you must use a 0.25 W 4.7 KΩ resistor . This pull-up resistor connects between the power pin and the data pin. 2. Install a DHT22 library. To facilitate the use of the DHT22 sensor, you can install a library specially created for this product. An example is the "SimpleDHT" library. To add it, select the Sketch -> Include Library -> Manage libraries tab. 3. Upload the code to the development board. To test your connections, you can upload a sample code. Select the File -> Examples -> SimpleDHT -> DHT22 Default tab. Don't delay, buy today. Add to cart now!