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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
Thanks! That's really good to know... The prototype has been posted so I should get it back in a week or so - but by the look of it I'll skip the resistors (except for a pull-dowm on CH_PD), and will replace them with a LED on GPIO2. As I'll be connecting GPIO0 to the STM32, I can make sure it's set to the correct state.