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nice compact design!
Get Set Up
What You'll Need & Learn
Raspberry Pi Class
I have updated the instructable by providing the .aia file in step 10 try it now!.i guess the comments section doesn`t support any files but only images
i uploaded the file but something has went wrong,let me check!
This is the .aia format of the app you can change or edit it by importing it using MIT app inventor website.