Adafruit Pro Trinket 5V 16MHz

Key Features:

• ATmega328P onboad chip in QFN package
• 16MHz clock rate, 28K FLASH available
• USB bootloader with a nice LED indicator & headers for an FTDI port for reprogramming
• On-board 5.0V power regulator with 150mA output capability and ultra-low dropout, up to 16V input, reverse-polarity protection, thermal and current-limit protection.

The Pro Trinket 5V combines everything you love about Trinket with the familiarity of the Arduino chip, the ATmega328. It' s like an Arduino Pro Mini with more pins and USB tossed in. Sometimes you just need more pins, more FLASH, and more RAM. That' s why the Pro Trinket has 18 GPIO, 2 extra analog inputs, 28K of flash, and 2K of RAM. It still has onboard USB bootloading support but with a MicroUSB jack this time. Optiboot support was added, so you can either program your Pro Trinket over USB or with a FTDI cable just like the Pro Mini. The Pro Trinket PCB packs much of the same capability as an Arduino UNO. So it' s great if you want to make an Arduino UNO project smaller. You' ll be happy to hear that not only is Pro Trinket programmable using the Arduino IDE as you already set up, but 99% of Arduino projects will work out of the box! Here' s some things you may have to consider when adapting
Arduino sketches: 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 keeps the Pro Trinket small and inexpensive. Use any FTDI cable to connect to the FTDI port for a Serial connection as the USB connection is for uploading new code only. 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.

Item Specifics
Size: 38mm x 18mm x 2mm / 1.5" x 0.7" x 0.08"
Height with MicroUSB: 4mm / 0.16"
Weight: 2.6 g