[jamesadevine]

On the microbit [1] we run the display's LEDs in reverse to turn most of the display into a light sensor [2]. It can then be used in code [3].

[1] https://microbit.org

[2] https://lancaster-university.github.io/microbit-docs/extras/...

[3] https://makecode.microbit.org/_Lgy9F04ar9Tm