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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.
@barbiani
It is the esp32 wroom module in a single chip.
https://www.espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf
All it needs are the antenna and its matching components.