FeeTech SCS0009 servo
https://cdn.fosstodon.org/media_attachments/files/110/108/595/410/007/754/original/59fff3bf93d9d8b6.jpeg
I always wanted to play a bit with proprioception in my walking #robots, that is, sensing of joint positions and forces, but with the low budget I put on this, I never had a good way of doing that with the cheap 9g servos. Smart servos tend to be much bigger and heavier and much more expensive, and various schemes for reading the position/force by modifying the cheap servos never worked reliably for me. But recently I found those small smart servos that should be straight replacements.
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