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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, the MDBT42Q definitely has the edge on power consumption - although it isn't as fast.
Also on the MDBT42 you don't need
setDeepSleep- the MCU handles everything automatically so you don't have to worry about it.