To run the appropriate code in Arduino IDE you will first have to install the DHT library in you Arduino directory.
Unzip the downloaded file and place it in this folder.
After copying the files, the Arduino library folder should have a new folder named DHT containing the dht.h and dht.cpp. After that copy the following code in the Arduino IDE and upload the code.
#include <DHT11.h> Â Â Â // Include Library for Sensor
int pin=4;            // Initialize Pin for Sensor
DHT11 dht11(pin);Â Â Â Â Â // Assign the Pin
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/* The setup() function is called when a sketch starts. It is used to initialize variables, pin modes, start using libraries, etc. This function will only run once, after each power up or reset of the Arduino board */
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void setup()
{
  Serial.begin(9600);        // Baud Rate
 while (!Serial)
{
   ; // wait for serial port to connect. Needed for Leonardo only
}
}
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/* This Particular Function is used for Repeated Execution of the Circuit until Specified. */
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void loop()
{
 int err;          // Initialize integer variable
 float temp, humi;  // Initialize the variables
 if((err=dht11.read(humi, temp))==0)  // When both values equals 0
 {
  Serial.print(“temperature:”);  // Print the Message
  Serial.print(temp);         // Print the Temperature values
  Serial.print(” humidity:”);    // Print the Message
  Serial.print(humi);         // Print the Humidity values
  Serial.println();    Â
 }
 else
 {
  Serial.println();
  Serial.print(“Error No :”);  // Print the Message
  Serial.print(err);         // Print the error values
  Serial.println(); Â
 }
 delay(DHT11_RETRY_DELAY);  // Delay for re-read
}
Welcome to the Arduino Based Humidity check Project which consists of DHT11 Humidity & Temperature Sensor Module and Arduino Sensor Shield. The humidity is sensed using a moisture dependent resistor. It has two electrodes and in between them there exist a moisture holding substrate which holds moisture. The conductance and hence resistance changes with changing humidity. Both these temperatures and humidity a changes are processed by an IC placed on the other side of the board. It calculates the values of both and can transmit those values to a microcontroller using only a single data line.
In this project we use sensor shield interfacing with Arduino Uno in which we connect the Dht 11 with sensor shield and reading will be shown on serial monitor.
Project Basic R3 Starter Kit compatible1 ×₹1,690.94
