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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.
@JumJum
Modul is this
https://de.aliexpress.com/item/32666340925.html?spm=a2g0s.9042311.0.0.38ad4c4dMBzc5s
I've no idea about the chip itself.
Manual is here
https://cdn.instructables.com/ORIG/FGT/H5J3/IUKEZCYF/FGTH5J3IUKEZCYF.pdf