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why an esp32 instead something simpler like an stm8 (or an stm32f103c8t6 if you need arduino compatibility) if you really want an mcu per key ?

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because I'm experienced in ESP32 and not in STM8. But now that you mention it, a little seed started to grow. Thank you kind stranger, lemme get back to you when this will probably 2 years from now on and another $2000 in research/playing around.

I said stm8 but there are a lot's of cheap microcontroller, I don't know what you use to program your esp32 but you should have a look at platform.io . I use that list https://registry.platformio.org/search?t=platform&p=1 to select MCU's for my projects.

The thing I like the most about it is that I don't have to manually install and managed various tool chains and it's a lot more flexible than the Arduino ide.

I use Free Pascal/Lazarus to target anything, ESP32 included. As for IDE where it runs, in a nice VM with plenty of processing power and memory on my PC so I can fast iterate code to production.

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