Variable Voltage: These servos can draw motor power directly from a lithium chemistry battery pack (3-cell for Dynamixel AX-12A, 2-cell for the other two) without external voltage regulators.

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Stacking three of these mechanisms on top of each other, with each stage driven by three Dynamixel servos, the motion seems almost serpentine.

The Raspberry Pi Zero Dynamixel Hat is an easy-to-use board that allows you to connect and communicate with Dynamixel Servo Motors by using the Savage Electronics AX interface circuit.

Melody is powered by upgraded P-Series servo motors from Dynamixel, which deliver smoother, more fluid, and humanlike movements, providing a more natural range of motion.

Then, finally, the muscles are replicated using 10 Dynamixel servo motors. Phew. Well, we did say it was complex. And it works amazingly well.