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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.
@Ollie
Your readings will be impacted by the environment, and will fluctuate, so the first thing you want to do is zero/rebase your readings. I don't think you can get a heading, but not withstanding that, once rebased you should be able to detect incremental changes. Obviously moving the puck (to another location) or introducing magnetic things near to the Puck will impact the reading again, so you'd need to beware of this.