Raspberry -> Teensy -> USB -> PC

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jasondigitized

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I've seen a ton of projects that use a Teensy to power a DIY mechanical keyboard that sends keystrokes to a PC. I would instead like to emulate someone typing on the Raspberry Pi and send that message, e.g. 'Hello World' through the Teensy to a PC via USB. What is the right way to do this considering the USB port on the Teensy will be taken to interface to the PC. Basically need to know how to wire the Raspberry PI to the Teensy with it connected to a PC via USB and not blow anything up.
 
Probably the easist method is serial on the Pi with the PC plugged into the USB port.

Re blowing things up the critical thing is that you need shared grounds and nothing too exciting on the power side. Ideally have the Pi and the Teensy powered from the PC USB, but reasonable alternate would be Teensy powered from PC USB and the Pi powered from a wallwart with a common ground, having made sure your 5V wallwart isn't a cheap on that puts half the pains voltage on the output at low current (multimeter from power supply gnd to PC case).
 
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