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Arduino® UNO R3
4.6 Board Recovery
All Arduino boards have a built-in bootloader which allows flashing the board via USB. In case a sketch locks up the
processor and the board is not reachable anymore via USB it is possible to enter bootloader mode by double-
tapping the reset button right after power up.
5 Connector Pinouts
Pinout
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Arduino® UNO R3 / Rev. 01 - 25/11/2021
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