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Thank you! Didn't think of that.

I believe I hit a noob problem - been a while since last working on a c++ project :) I want CAN buses to be accessible across the Arduino code (several files) so I can not simply declare and define them in the main (.ino) file. What I tried: can_bus.h #ifndef CAN_BUS_H #define CAN_BUS_H...

MAX7219 should be really be powered with 5V (you can use Vbus if current doesn't exceed bus limits) but it will "understand" 3V logic signals from Teensy 3.x. Tested... But please don't take this for granted since datasheet really states 3.5V as miminum for recognising logic high.

Modify the i2c_t3.cpp file. Change the line #if defined(__MK20DX128__) to #if defined(__MK20DX128__) || defined(__MK20DX256__) and download the new Wire.h and Wire.c from http://forum.pjrc.com/threads/24656-teensy-3-1-and-Wire-h