I’ve just got my RA8875 based 7″ LCD up’n running together with Arduino UNO. After a bit of struggling with removing SMD resistors, “jumpers”, bad connections etc. I first got it working with the example files for the Adafruit RA8875 Driver Board.
I then started investigating the capacitive touch screen controller (FT5206). After reading the documentation and some experimenting, I finally managed to write a driver for 5 point multitouch. I’ve pushed the arduino code to github for those who are interrested.
The code includes the basic wiring details.
(jan 2017) If you want to experiment with a standalone 7″ multitouch panel without display, you might take a look at 7″ standalone capacitive multitouch panel (800×480).
I really like the feeling of the capacitive touch. Too bad that most “hobbyist” screens typically come with resistive screens.