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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
It was good timing. Never tried NFC before but now I am testing those 52832 based keychain NFC tags https://forum.espruino.com/conversations/388395/
They are simple - no sensors, just button, two leds, piezo and NFC, but they are small and cheap and even have 32kHz crystal and DC/DC enabled. Espruino on the keychain is cool and NFC and piezo speaker is a nice bonus, typical smart watch is missing both.