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App Inventor Arduino DHT11 Project

Display the temperature measured by DHT11 sensor in smartphone

Purpose of this tutorial:

In this tutorial we will see how to send the temperature value of the DTH11 sensor to the smarthpone via bluetooth.

This is why we are going to create two programs: a mobile application with App Inventor for the smartphone and a program for the Arduino board.

Necessary components

  • Arduino
  • Smartphone
  • DHT11 temperature sensor
  • wire connections

Mounting

Program

Here is the program that allows you to connect the Arduino board to the smartphone and send a message containing the temperature value measured by the DHT11 sensor via bluetooth.

Creation of the application with App Inventor:

We will create a mobile application named ‘temperature_arduino’ with App Inventor which allows you to receive a message from the Arduino board.

We propose to create the design of the application, with the following visual:

Programming with App Inventor

To program the application, App Inventor offers us to use the Blocks space, which allows you to create a program in the form of a block diagram. Very easy to use but requiring a little programming logic.

Here is the program of the application created in the Blocks area of ​​the Inventor App:




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