Datasheet
Plug in the Trinket, make sure you see the green LED lit (power good) and the red LED
pulsing. Press the button if the red LED is not pulsing, to get into bootloader mode.
Click the Upload button (or select File->Uplo ad)
If everything goes smoothly you should see the following (no red error messages) and of
course, the red LED on the trinket will blink on/off once a second
© Adafruit
Industries
https://learn.adafruit.com/introducting-pro-trinket Page 33 of 41