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at best buy a 5v power
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yes, it's right.
you may see some introductions in following website:
http://www.sfleds.com
Espruino
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.
You many find some informations in following website:
http://www.sfleds.com