Datasheet

Setting up Arduino IDE

Chances are, you picked up a Trinket because it is programmable with the Arduino IDE. The Pro Trinket uses the same

core chip as Arduino UNO, and the 5V Pro Trinket uses the same clock rate and voltage so its pretty much a full

Arduino-compatible, just smaller!

The only changes you may have to consider when adapting Arduino sketches are:

Pins #2 and #7 are not available

The onboard 5V regulator can provide 150mA output, not 800mA out

You cannot plug shields directly into the Pro Trinket

There is no Serial-to-USB chip onboard. This is to keep the Pro Trinket small and inexpensive, you can use any

FTDI cable to connect to the FTDI port for a Serial connection

The bootloader on the Pro Trinket use 4KB of FLASH so the maximum sketch size is 28,672 bytes. The

bootloader does not affect RAM usage.

Arduino IDE Setup

Just follow the steps in the Adafruit Arduino IDE setup guide to add Adafruit board support to the Arduino IDE to

program Pro Trinket!

Don't forget to also install Windows drivers if you are using Windows, or setup udev on Linux

When you're finished installing the IDE come back to this page to continue the Pro Trinket guide.

Blink!

OK let's practice uploading a sketch by uploading the classic Blink sketch with the USB bootloader. This program with

blink the onboard red LED that is connected to pin #13.

The sketch is in File->Examples->Basics->Blink

Select the Pro Trinket 5V/16MHz (USB) or Pro Trinket 3V/12MHz (USB) board from the Tools->Board menu

Even though Trinket has a USB connector, it does not have a "Serial Console" capability, so you cannot use

Serial to send and receive data to/from a computer without a separate FTDI Cable!

If you are using Linux you may have to be "root" running the Arduino program to have access to the USB port