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I plan to connect a sensor board, communicating over I2C and operating at 3.3 VDC, with a Teensy 3.6 via the SCL0 (pin 19) and SDA0 (pin 18) ports.

The only hookup documentation I have on that...

I will like to connect a CAN Transceiver PCB using the Microchip MCP2551 (or reasonable equivalent) to a Teensy 3.6 in a breadboard just using jumpers. No soldering.

Looking for recommendations...

I am testing some large programs in Arduino on a Teensy 3.6. The software is itself large (over 4k lines of source) and uses 55K of Flash. Global variables take 6K of RAM and I seem to be running...

Can the Arduino SD class be used to access the SD card on the Teensy 3.5 or 3.6 ?

At the very end of compilation under the Arduino IDE, I received these loader errors:
...

Thank you again. Have the pawelsky version. Will look into the collin80 as well.

Thank you.

I am working with a Teensy 3.5 and a Teensy 3.6. Any CAN library available that is compatible with Teensyduino and works with these Teensy boards ?

Unfortunately, I can't say more about the project. But, the fact that your largest size code went to 170 KB makes me feel better.

Thanks for the extensive replay. i will try the setup / loop breakdown.

There may be issues related to typing and overall size of the code. But, let me give it a shot.

What's the largest...

Anything else besides Arduino ? I am developing code using gcc. So, can I just use plain gcc to create hex files ?

Downloaded the blink_hex zip file in order to start testing. I have a Teensy 3.5.

However, there are multiple hex files in the unzipped folder. Appreciate someone telling which is the correct hex...