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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, I've updated the docs. Maybe someone else can give more info on the Bluetooth module - I'm not too sure on low power but there may be something available via AT commands.
As far as clocking down, Espruino can do it, but then the frequency for PWM (and also USART/SPI baud rates) will change. Some kind of compensation needs to be built in for that - otherwise it's very possible to do. The obvious change would be to clock everything down to a lower speed when entering Sleep mode. That would probably halve power consumption.