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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.
@Loop
If you can afford something simplier, I would adapt http://www.espruino.com/Single+Button+Combination+Lock - It's just security trough obscurity, but a lot easier to implement (reenable the console when the right sequence has been pushed)
I agree with Gordon about not bothering much with security anyway, I don't think password protecting the console would be generally useful.