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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.
@allObjects
@user71789 looks like that your are just fine with what you listed so far. You need also some wires - solder or breadboard style. For power supply consider something like that*
https://www.rapidonline.com/trupower-bh7-3003s-battery-holder-3x-aaa-with-flying-leads-and-switch-18-0593
or
https://www.rapidonline.com/trupower-sbh-331as-battery-box-3-x-aa-with-switch-18-2908
...just to complete your shopping list.
...and yeah, forgot the switch you may need when you don't want to fiddle with the Espruino onboard PicoSwitch ;)
https://www.rapidonline.com/Catalogue/Searches?query=switch%20push%20button&filterSearchScope=1
...and some sort of enclosure to put everything into it...
https://www.rapidonline.com/Catalogue/Searches?query=case&filterSearchScope=1&tier=General%20Purpose%20Enclosures