I like the idea of the short vs long press, but for my adhd, that's an extra step that would lead me to using it less or not at all. Silly as it seems, I need the process to be dummy simple not because I'm dumb, just because I'm so easily distracted and demotivated. I do like an LED display on remaining time, though I wasn't sure how complicated that would end up being. Would I need a separate LED for each button, or could one hook to all and measure the time segments in software automatically? IDK, I'm new to it, so I don't even know what my options are. I do use rechargeable in the house, so batteries wouldn't be the worst, but is there an advantage to do batteries over just a USB cable into the computer for power?
I will absolutely document everything, including woodworking if anyone is interested in seeing that. Do you have any suggestions on the buttons, buzzers, or of course the actual arduino board? I have no clue where to find what I need other than the wood enclosure