Hello Vera, welcome to the App Inventor Community
You will need to use the MIT BLE Extension. Unfortunately, at the moment connecting to the micro:bit is not plain sailing. However, this Topic should help:
App Inventor, Micro:bit and UART
Somehow, communicating with a micro:bit via UART is more difficult than it should be. For now, using the extensions as indicated in this tutorial, will ensure that everything works.
This tutorial is intended to show how to use Bluetooth Low Energy (BLE) to send messages to a micro:bit. This can be used to control a toy robot car or any device that uses a micro:bit as its brain.
This first part will only cover the basic communication with a micro:bit via BLE. A…
The very latest BLE Extension:
Hello everyone,
We have a beta version of the BLE extension that incorporates the new Bluetooth permissions introduced in Android 12. Please make a backup of your projects before upgrading the extension. Because this is a work in progress, there may be issues that still need to be addressed. If you try it out, please leave feedback in this thread.
edu.mit.appinventor.ble-20230223-beta.aix (200.0 KB)
Regards,
Evan W. Patton, Ph.D.
Lead Software Engineer, MIT App Inventor