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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.
@Ganblejs
Hi!
What's the reason for you wanting this? The screen of B2 is designed to be always on - it's called a 'transflective display' sometimes.
You could make a clock face or bootloader app that paints the screen black whenever it times out. I don't know if there already is one.