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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
Just to add - it's actually quite a handy thing to be able to do. USART RX requires a decent amount of power (1mA or so?) as the oscillator has to stay on - but you can enable just the TX pin and so can transmit on the USART without sapping power.