View source for KS0430 Keyestudio DHT22 Temperature and Humidity Sensor



[[image:Ks0340-1.png|thumb|400px|right|Keyestudio DHT22 Temperature and Humidity Sensor]]

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== Overview == 
This DHT22 digital temperature and humidity sensor is a composite Sensor which contains a calibrated digital signal output of the temperature and humidity.<br>
The dedicated digital modules collection technology and the temperature and humidity sensing technology are applied to ensure that the product has high reliability and excellent long-term stability. <br>
Qualities of excellent quality, ultra-fast response, strong anti-interference, and high cost performance make it a wide applied application or even the most demanding one. <br>
The sensor comes with 2 fixed holes, very easy to mount on any other devices.<br>
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'''Applications:''' dehumidifier, testing and inspection equipment, consumer goods, automotive, automatic control, data loggers, weather stations, home appliances, humidity regulator, medical and other humidity measurement and control. <br>

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== Specifications == 
* Operating voltage: DC 3.3V-5V
* Interface: 3PIN 
* Output signal: single-bus digital signal
* Humidity measurement range: 0----100%RH
* Humidity measurement accuracy: ±2%RH
* Temperature measurement range: - 40℃ to 80℃
* Temperature measuring accuracy: ±0.5℃
* Dimensions: 43mm * 26mm * 9mm
* Weight: 5.9g
<br>[[File:Ks0340-2.png|500px|frameless|thumb]]<br>

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== Hookup Guide==
<br>[[File:Ks0340-3.png|600px|frameless|thumb]]<br>

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== Source Code ==
<span style=color:red> Before compiling the code, don’t forget to place the necessary DHT library into libraries directory of Arduino IDE. Or else, code upload will fail!  </span><br>
You can click the link on how to use Arduino IDE:
https://wiki.keyestudio.com/How_to_Download_Arduino_IDE

<pre>
#include "DHT.h"
#define DHTPIN 3     // define the connection pin 
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE);
void setup() 
{
  Serial.begin(9600); //set the baud rate 
  Serial.println("DHTxx test!");//print the character and line wrap
 
  dht.begin();
}

void loop() {
  float h = dht.readHumidity(); // calculate the humidity value
  float t = dht.readTemperature(); //calculate the temp.value
  if (isnan(t) || isnan(h)) 
{
    Serial.println("Failed to read from DHT");//show the contents and line wrap
  } 
else 
{
    Serial.print("Humidity: "); //print the humidity
    Serial.print(h); //print the humidity value
    Serial.print(" %\t");//print the content
    Serial.print("Temperature: "); //print the temperature
Serial.print(t);//print the temperature value 
Serial.println(" *C");//print the temperature unit and line wrap
  }
}
</pre>

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== Test Result ==
<br>[[File:Ks0340-4.png|500px|frameless|thumb]]<br>

Hook up the sensor to main board and upload the source code. Power on, open the serial monitor and set the baud rate to 9600; you are able to see the current ambient temperature and humidity value. As shown below.
<br>[[File:Ks0340-5.png|600px|frameless|thumb]]<br>


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==Resource==
*'''Download all the relevant info.from the liink below:''' <br>
https://drive.google.com/open?id=1-pzR2zVjjDpFEcUxsOx6qgJDtg7JAYUj

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==Buy from ==
*['''Official Website''']

*[''' Shop on aliexpress ''']



[[category:Sensor]]