Here I fix the brightness bug.

Subsequent to the video I removed the "debounce" logic entirely as it had the effect of causing the display to update only intermittently if the signal was changing frequently. Of course when it was changing frequently I couldn't read it anyway but the random frequency updates weren't nice aesthetically.  

If however one wanted a display that periodically sampled a fast changing digital value then those waits were a good idea (I don't)