![]() ![]() ![]() The USB connection is for uploading new code only. 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. There is no Serial-to-USB chip onboard.You cannot plug shields directly into the Pro Trinket.The onboard power supply is a 3.3V regulator and it can provide 150mA output.Pins #2 and #7 are not available (they are exclusively for USB).Here’s some things you may have to consider when adapting Arduino sketches: ![]() Make sure to read the documentation on the libraries you wish to use before selecting the Pro Trinket 3V. While this shouldn’t affect most libraries, it may have an impact on libraries which are timing critical. The 3V Pro Trinket runs at 12MHz which differs from the 16MHz of the Pro Trinket 5V and Arduino Uno. This should only be a problem if your pushing the absolute limit of the Uno’s flash memory when you got to make the switch over to the Pro Trinket. Keep in mind that because of the Pro Trinkets USB bootloader, the flash storage (Arduino sketch size) is reduced to 28K instead of the Uno’s 31.5K. With all this capability packed into a form factor of only 1.5″ x 0.7″ x 0.2″ (without headers), you will be surprised how easy it is to migrate your project from an Uno down to the tiny Pro Trinket. The Trinket Pro has a total of 18 GPIO, 2 extra analog inputs, 28K of flash, and 2K of RAM. Say hello to Adafruit’s newest addition to the Trinket lineup, the Pro Trinket! Not only does is support the much loved ATmega328P, but also has a custom bootloader that gives you a handy USB interface. ![]()
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