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Arduino Small Form Factor Boards - Adafruit 2000, The Pro Trinket uses the ATmega328 common-core chip to give a microcontroller similar to the Arduino Pro Mini but with USB and more pins. The Trinket is designed with 18x GPIO pins, 2x extra analog inputs, 28K of FLASH and 2K of RAM. There is onboard USB bootloading support (via a micro USB jack) and Optiboot support enable programming over USB or with a FTDI cable. This 5V version operates at 16MHz and is Arduino compatible, working with 99% of existing Arduino sketches. There is no serial to USB chip and the USB connection is for uploading new code only. The Trinket is programmable using the AVRdude and/or the Arduino IDE, and there is a reset button for entering the bootloader or restarting the program as well as LED indication for bootloading. Learning tips and tutorials can be seen here. Adafruit 2000 Pro Trinket 5V ATmega328 16MHz Clock 28K FLASH 18 GPIO