![]() That's because we use those two pins for the USB bootloader. If you're used to using an Arduino Uno, you may notice that pins #2 and #7 are not available. These pins cannot be used for LEDs, buttons, servos, etc. They're kind of an 'extra' that you get with the Pro Trinket. The two pins that sit sort-of inside the body of the Pro Trinket, A6 and A7, are analog input only pins.
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