The onboard 5V regulator can provide 150mA output, not 800mA out.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: 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 Trinket’s 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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