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The comprehensive GPIO pinout website for the BBC micro:bit


P3: LED Matrix (Column 1)

P3 is wired to Column 1 of the onboard 5x5 pixel LED matrix on the BBC micro:bit.

While the LED matrix is 5x5 (25) pixels, there are 9 columns and 3 rows. Columns 8 and 9 drive only two LEDs each.

While you may use this pin for other purposes, you must take into account that it is wired to LEDs and their associated resistors.

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Created by Phil Howard & Joshua Lowe.