Air Meter Making #2: Use the Arduino DHT 11 Module

Air meter making, a second time! Let's look at temperature and humidity using the DHT 11 module.

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Air Meter Making #2: Use the Arduino DHT 11 Module

Things used in this project

Hardware components

Arduino UNO

DHT11 Temperature & Humidity Sensor (3 pins)

Software apps and online services

Arduino IDE

Story

I learned to use the WiFi module last time. This time we will look at the most important temperature and humidity sensors in this project.

Step 01

A dedicated library is required to use the DHT 11 module. Download the file below.

File 01 http://deneb21.tistory.com/attachment/cfile24.uf@220A6C3755DA9E322E7FED.zip

Once you have downloaded the file, load DHT 11 from the library.

If the file is successfully loaded, the following screen appears.

Step 02

Now let's look at temperature and humidity with DHT 11 module.

Once you have entered the code and clicked Upload, you can see the temperature and humidity by checking the serial monitor.

Now we know how to use the DHT 11 module!

Next time, I will work on sending the temperature and humidity data to the server using ESP-01 module and DHT 11 module learned earlier.

Until now, it was ParkMoonsu! See you next time!

Note: sites and source of the file - http://deneb21.tistory.com/

Code

DHT 11 CODE

#include <DHT11.h>    //Load library
int pin=2;            //Pin number of the signal
DHT11 dht11(pin);        
void setup()
{
   Serial.begin(9600); //Communication speed setting
}
 
void loop()
{
  int err;
  float temp, humi;
  if((err=dht11.read(humi, temp))==0) //Read temperature, humidity read
  {
    Serial.print("temperature:");
    Serial.print(temp);
    Serial.print(" humidity:");
    Serial.print(humi);
    Serial.println();
  }
  else                                //Processing in case of error
  {
    Serial.println();
    Serial.print("Error No :");
    Serial.print(err);
    Serial.println();    
  }
  delay(1000);                        //Repeat every second
}
 


//source: http:deneb21.tistory.com/207 [Do It Yourself!]