This is f**king insane.
I always wondered what that green light under my watch was doing, so I asked Claude to build me one I could take apart.
What it shows:
> Claude Code built the whole watch with the free anatomy skill, 9 parts packed into 10.7 mm.
> Flip it over and the sensor dome holds green LEDs, 4 photodiodes and a ring electrode.
> The LEDs flash hundreds of times a second. Blood soaks up green, every heartbeat dims what comes back and the dips read 72 bpm.
> A finger on the crown closes a loop through your heart for a 30-second ECG.
> The tap on your wrist is a small weight on 2 springs, kicked by a coil.
The system that takes apart anything 👇
Learning
A take-apart watch that explains the green sensor light
Elvar asked Claude Code to build a watch model that can be taken apart, revealing the green LEDs, photodiodes, ECG ring, and heart-rate sensing. The anatomy skill produced a 9-part model in 10.7 mm, with the sensor dome showing how heartbeats dim reflected light.
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- Claude Code, anatomy skill
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