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The comprehensive GPIO pinout website for the BBC micro:bit


Power (3V)

The micro:bit is capable of supplying 3V power but only up to a maximum current of 90mA. Exceeding this threshold will cause excessive heating of and potentially damage to the onboard voltage regulator.

The onboard KL26 regulator is rated at a maximum of 120mA when powered from USB and a budget of 30mA is allowed for the nRF51822 and peripherals that make up the micro:bit itself.

The onboard KL26 regulator is not used when powered from battery.

For more information see: https://tech.microbit.org/hardware/powersupply/

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Created by Phil Howard & Joshua Lowe.