
commercial watch does not provide. You can use
the exact colors you’d like to wear.
And during assembly, you can also choose the
size of the battery, adapting the design to your
taste and giving it a battery lifetime far greater
than a couple of days (Figure
A
).
Open Tools
To build my watches I’ve used Blender to design
the 3D-printed cases and KiCAD to design the
PCBs. Both are free and open source software,
which means that whoever wants to take a
look at my designs and modify them can do so
without any monetary hurdles.
Making Progress (Iterations)
My first prototype, the EspWatch, was based on
a 1.54" e-paper display combined with ESP82