Running a counter

My aim is to run an app, using Bluetooth out to an Arduino.
That will then start a flashing LED rhythm.
All good and pretty easy - so far.
I want the Arduino to set up a count of sequences, and to send that back to the app via Bluetooth.
I think I can set this bit up.
But I want the app to display a digital type display of number of repetitions.
There will be a maximum of 2 numbers, and I’d like it to look like a digital display.
OK. Thanks. Noob signing off.

… and the problem is that there isn’t a digital display type font that you could use in a Label Component. However, what you can do is make images of the numbers to be displayed and update an Image Component programmatically via the same Block that receives the data from Arduino.

OK. That sounds about right. Now all I have to do is to work out how…

BTW the app work I’ve done so far is gleaned from youtube.
Is there anywhere I can look to find out the actual function of each block?


Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor’s Manual here in the AI2 free online eBook … the links are at the bottom of the Web page. The book ‘teaches’ users how to program with AI2 blocks.

There is a free programming course here and the aia files for the projects in the book are here:

How to do a lot of basic things with App Inventor are described here: .

Also look here and here for more tutorials.