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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
I tried to use that ~$5 amiibo nrf52832 based keychain for that but it is not very loud, there is very small buzzer inside, I even got bigger louder buzzer chips that still somehow fit inside ( "7525 Passive" from https://www.aliexpress.com/item/32864653388.html ) but did not finish it. So with that having it on your keys could work.