Really interesting question. Unfortunately there’s almost no GPIOs left. You might be able to hook into the TX pin on the board (other than during bootloading, OpenSegment currently doesn’t transmit anything out) and write an ‘on-change’ interrupt to capture the incoming pulses. You’d really only need to count the milliseconds between two pulses every few seconds and adjust the brightness of the display accordingly. You’d probably only need to check the pulse train coming from the TSL235R light sensor once a second. Changing the brightness more often than a second might look a bit odd.
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