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Adafruit Pro Trinkets are available in 3V 12MHz and 5V 16MHz versions with the ATmega328 at their core, the same chip in the Arduino UNO/Mini/etc. at the same speed and voltage. The 3V version uses 3V logic and 12MHz clock which is good for lower-power and lower-voltage setups. The Pro Trinkets are like an Arduino Pro Mini but with more pins, FLASH, and RAM. The Pro Trinket has 18 GPIO, 2 extra analog inputs, 28K of flash, and 2K of RAM. The Trinkets have onboard USB bootloading support and feature a MicroUSB jack. Optiboot support has been added to program the Pro Trinket over USB or with a FTDI cable. The Pro Trinket PCB measures 1.5x0.7x0.2" (without headers) with the same capability as an Arduino UNO. The Pro Trinket is programmable using the Arduino IDE and works with 99 percent of Arduino projects out of the box.
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