Why the inventor does not work with the Arduino by connecting to the uart port ,,Note that there is a connection on the Serial USB Terminal application ???

[ChrisWard]

Hello Ossaa, welcome to the forum.

Why are you ignoring the result of the OpenSerial call? Your code should only continue if OpenSerial = True.

I'm not sure about the required hardware - are you using Rolf Kardell's extension?

Using serial with FTDI

...sounds very interesting, especially given the number of people that use App Inventor with microprocessors (and gadgets).