Datasheet

If you get the error message avrdude: Error: Could not find USBtiny

device (0x1781/0xc9f)

That means the bootloader wasn't active. Make sure to press the button on the Trinket to activate

the bootloader before clicking the Upload button.

If you get a lot of red text, errors and also a warning about Verification

Failed

Check that you updated the avrdude.conf file above - if you don't update the description of the

Attiny85 in the configure file by replacing it, the IDE wont know to be patient with the Trinket

bootloader and will have many upload errors

Industries

https://learn.adafruit.com/introducing-trinket Page 37 of 65