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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
Hi,
You're right, there's no external oscillator. The Softdevice actually does a pretty good job of calibrating its RC oscillator. Pin D0 is used for the button, so I don't believe you could add an RC oscillator to the Puck itself.
On the DK it's not enabled either. You could recompile with this changed: https://github.com/espruino/Espruino/blob/master/targets/nrf5x/bluetooth.c#L1838
But it's been left out because I wan't able to find a way of checking if the LSE is there, and if it doesn't work when you upload the image then it's particularly frustrating.