• Yep, it's a DT No.1 F18 watch. I reckon there is space for something small - and if you cut away at some of the plastic surround that's inside (the 'puck' shape you can see in the video) or 3D printed your own you could definitely get quite a lot of extra space.

    Actually getting IO to connect to could be a bit more difficult - but at the very least the piezo speaker IO could be used for OneWire stuff and is very accessible, and there is an analog IO for the heart rate monitor that you could use as well.


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