Hobbyist builds an MCP server so Claude can draw working circuit diagrams in under an hour
rballonline · reddit · 2026-10-31
A Redditor wanted Claude's help designing a circuit for a Halloween prop (3.7V battery, SAM21 chip, multiple LEDs with pulse logic). Claude's raw diagram attempts were "comically bad," so he wrote a small app plus an MCP server as a diagramming tool — after which Claude produced schematics good enough that his actual wiring worked.
Takeaways:
- What would have taken hours of research and planning became a working prototype in under an hour.
- He stress-tested the setup on a bigger project, feeding reference images and asking to add an amplifier — output still needs manual verification, but is far from garbage.
- The meta-lesson: instead of complaining that models can't draw specialized diagrams, build them domain-specific tools via MCP and let the model call them.
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