I wouldn't say dated, I'd say old school (with reverence). I'm not at all implying you should have used arduino, in fact I'm more anti-arduino because you don't learn how to do thigs properly, kinda like getting a chauffer and thinking you've learned to drive. PIC's and HC0x were my faves in the day depending on the task. I've scoured too many datasheets to remember. Arduino makes it super easy in both supply (OMG quantity lead times of the past!) and coding if you can suffer it's limitations or just want to use it and don't care about the why & how stuff. I mean you can also easily sidestep the "arduino processing" stuff and use it properly and enjoy the swathes of hardware targeted at the environment. I use ESP32's or STM32's mostly, again coz they've made it too easy not because I can't otherwise.
Anyway, the result looks A1 you should be proud.
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