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TIMELINE
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Jul 28 16:56
Because the entire surface of the ball-shaped display is an LED display, all circuits—including the power supply and microcontroller—and batteries such as LiPo cells are enclosed within the sphere. The power circuit is therefore extremely important and must account for LiPo charging and discharging, power-switch control, and related behavior. This time I designed and implemented the power circuit and published the work on my blog. https://zenn.dev/sastle/articles/9282f7e9713a35
Because the microcontroller, power supply, and LiPo battery all need to fit inside the sphere, every module must be contained within a fixed volume. I am self-taught in electronics and cannot claim the design is especially good yet, but implementing the most delicate component—the power system—will help me improve my skills.
For this version, I am assuming a 2S configuration—two cells in series—to double the supply voltage because lighting the LEDs may create large load fluctuations. However, for longer operating time, I also want to consider a 2P configuration—two cells in parallel. I will therefore design a 1S2P power circuit as well.
Jul 24 17:25
Finalized the definitive design for Isolation Sphere, a homemade gadget that lights up a contact-juggling ball, and began documenting the development as a blog series. It is a hand-held, rollable glowing sphere with numerous LEDs covering its 100 mm-diameter surface.
Write detailed Zenn articles on topics such as polyhedron construction, FPC development layouts, and firmware, and make them reachable from the introduction’s table of contents.
Does the description “a gadget that lights up a contact-juggling ball” make it clear what is being built?
7 2026 24
The isolation sphere project was started.