Datasheet

Re-programming Bootloader

If you'd like to reprogram the bootloader on your Pro Trinket, or update the bootloader to not have the Optiboot-loop-

on-RX bug, download this zip of two Arduino sketches

These are only tested on an UNO! For non-UNOs you'll need to swap pins 11, 12, 13 for the hardware SPI pins but we

haven't tested it at all, so UNO only please.

protrinketbootloaders_2015_06_09.zip

https://adafru.it/fmh

Load one or the other onto the Uno, depending on which type you are programming, then connect

Pro Trinket 13 -> Arduino 13 (Use ~1K series resistor if prog'ing Pro Trinket 3V)

Pro Trinket 12 -> Arduino 12

Pro Trinket 11 -> Arduino 11 (Use ~1K series resistor if prog'ing Pro Trinket 3V)

Pro Trinket GND -> Arduino GND

Pro Trinket VBAT -> Arduino 5V

Pro Trinket RESET -> Arduino 10 (Use ~1K series resistor if prog'ing Pro Trinket 3V)

open the terminal @ 57600 baud and press G and return (or click Send)