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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.
@Gordon
Yes, you can - plus D1 is a LED that indicates bootloader status.
I'll document it all a bit better and will actually list them in an online shop soon. Unfortunately it's all got a bit delayed. Just ask if you have any other questions though.