Switch LEDs on and off with smartphone and Micro: bit

Purpose of this tutorial:

In this tutorial, we will create a system allowing LEDs to be turned on and off (by bluetooth) using the Micro:bit card and a smartphone.

We create two programs: a mobile application with App Inventor for the smartphone and a makecode program for the Micro:bit card.

Necessary components

• Micro:bit
• Smartphone
• LEDs

• Test plate

• Connecting wires

For mounting the Micro:bit card with LEDs you can see the following article: https://www.robotique.tech/robotics/traffic-light-with-microbit/

Programme makecode

Voici le programme makecode qui permet de connecter la carte Micro:bit au smartphone et de recevoir un message contenant l’ordre d’allumer ou éteindre les LEDs.

Creation of the application with App Inventor:

We are going to create a mobile application named ‘allumer_leds’ with App Inventor which lights up LEDs.

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: