A sleep-deprived father named Ceyhun Karataş automated a BabyBjorn spring-loaded bouncer using a Futaba S3003 servo, an Arduino Nano, and 3D-printed mounts. The servo reels the seat down via a string, the chair's built-in spring pulls it back up, and two potentiometers let you tune speed and amplitude independently.
The full build files are on Thingiverse at thing:7393849. Karataş is explicit: this does not make unsupervised use safe. What it does is free one hand, which for a hacker with a baby is the difference between a productive evening and none at all.
Read the original for the mechanical detail on how the servo mounts to the rocker base and why the component choices are as minimal as they are. The video demonstrates the motion and confirms the audio is not AI-dubbed, which matters more than it should.
[READ ORIGINAL →]