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thanks mlu, that worked

Sorry to keep bugging you Paul, Google can find anything on -DUSB_LIBUSB I'm guessing it's part of the libusb c library I've tried sudo apt-get install libusb-1.0-0-dev Not sure what to do.

Not sure if I'm compiling it right $ gcc -Wall load_linux_only.c -o load_linux_only /tmp/ccOyK2XX.o: In function `main': load_linux_only.c: (.text+0x267): undefined reference to `teensy_open' undefined reference to `hard_reboot'...

Thanks for the info Paul. I've been looking at http://magikh0e.ihtb.org/pubPapers/Raspberry.Pi.Hacking.pdf which suggests using the UART / Serial interface going through a logic level converter to keep the voltage at 3.3V. Other posts I've read suggest that a converter isn't needed if the Teensy...

I'm a noob when it comes to electronics, I've gone and bought a few toys and now don't know how to get them working together. I want to run a 16x30 rgb matrix made of 2811 strings. I can get the strings running using OctoWS2811 LED Library examples on the Teensy3.0. I think I can use the example...