How do you use App inventor blocks for micro:bit IO pin configuration?

[Ghica]

Hi Wilson,
It has been a while since I last tried working with the micro:bit, but as far as I know not much has changed.
If you just want to display a smiley or something like that, the newest (well, already quite old I think) micro:bit extension, should be fine, but if you want to have a meaningful communication with a micro:bit, you need UART, and that is only available through the old extension.
See here to find the links:

App Inventor, Micro:bit and UART

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 micro:bit v2 is much nicer with UART because it has more memory.
I think the best way to handle a mcro:bit is to write code for the micro:bit itself, that receives commands via UART and then does something with these commands. My example is driving a little robot. There is also an example of controlling a robot arm.
And, better than using the extension for the micro:bit, use the general BLE extension, if you know the right UUID's. But you still have the problem of finding the right data formats.