@ZENAR57 Did you get serial working in your development environment (APDE, Android only and no PC)?
I have now!
I did this with Processing for Android (development on PC) to test the library.
I followed instructions on this site:
I got an OTG cable yesterday.
I wrote a very minimal sketch:
- Arduino Mega is is counting up and sending data every 500ms.
- Android is receiving and display count to the screen.
It is working!
I may try your approach in the future but not anytime soon. I am very busy these days.
:)