back to this project while waiting prints...

Got one loose 2.7" display today and breakout board.

Then need to pick a microcontroller to do the job. atmega328 or any other used on arduino would be easy as has most of the sw ready. but i have something personal against atmel. maybe i will make testing with teensy 3.1 which i should have few somewhere.

This is familiar to me, supports most of the arduino libraries. Programming firmware to the K20 used on teensy custom designs requires auxiliary cpu, but it can be hooked on programming adapter (this is the small MINI54 on the lower left corner)

Have to check memory requirements of used libs, but this has 256kB flash and 64kB ram (compared to atmega328 32kB flash and 2kB ram) so maybe no sd card needed...

below is first block-diagram.