Published February 26, 2016 © GPL3+

Room temperature sensor with display on Mobile

A project that displays the temperature and humidity of a room on your mobile in real time.

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Room temperature sensor with display on Mobile

Things used in this project

Hardware components

Arduino UNO

DHT11 Temperature & Humidity Sensor (4 pins)

Jumper wires (generic)

Arduino Ethernet shield

USB-A to B Cable

Android device

Breadboard (generic)

Software apps and online services

Arduino IDE

Blynk

Story

This system connects your hardware to the android device.

A dht11 sensor is used with arduino uno to sense temperature and humidity of the environment. It sends the value to your android device which is neatly displayed in the app. This system is very easy to build and is useful for real time monitoring off a remote room with an amazing display.

You will need-

Arduino Uno
Arduino Ethernet Shield
Dht11 Sensor
Jumper wires*3 (male to female)
Arduino IDE
Blynk app
Lan Cable

The sensor is connected to the digital pin 2 of the arduino.

Virtual display is created on the app to display the values. The display is updated in real time.

App displaying the values

Happy Hacking

Code

Room temperature

#include <SPI.h>
#define BLYNK_PRINT Serial
#include <Ethernet.h>
#include <BlynkSimpleEthernet.h>
#include <SimpleTimer.h>
#include <dht11.h>
dht11 DHT11;
SimpleTimer timer;

char auth[] = "";        // write your auth code here
void setup()
{
  DHT11.attach(2);      // connect pin 2 to the sensor
  Serial.begin(9600);
  Blynk.begin(auth);     // start blynk server and connect to the cloud
 while (Blynk.connect() == false) {
    // Wait until connected
  }
  
void loop()
{
  int chk = DHT11.read();
   Blynk.virtualWrite(1, DHT11.temperature);  // Write values to the app
  Blynk.virtualWrite(2, DHT11.humidity);
Serial.println(DHT11.temperature);

  Blynk.run();
  timer.run();
  
}

Credits

Kaustubh Agarwal

14 projects • 191 followers

IoT Enthusiast SDE@ASML