Source code

Original code for the Pro Trinket bootloader on github
We do not offer any support for this code, it is released as-is!

Please note: you cannot use the Adafruit USB VID/PID for your own non-Trinket/Gemma products or projects. Purchase a USB VID for yourself at


Pro Trinket 5V 16MHz:

Pro Trinket 3V @ 12MHz

Fabrication print, dimensions in inches (same for both 3V and 5V)

This guide was first published on Aug 20, 2014. It was last updated on Aug 20, 2014.

This page (Downloads) was last updated on Dec 04, 2021.

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