Twelve servo quadruped walks on a web interface

Oct 23, 2026 Last reply: 10 hours ago 2 Replies
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Getting a twelve servo walker to move smoothly under wireless control is one of those builds that looks simple and is anything but. Every leg has to be sequenced with the others, and doing that over a browser link rather than a tether is a real test of the whole design. That is the challenge this project takes on, and from what is shown, it comes through.



The body is put together from light green and dark grey parts, with micro servo motors driving each articulated leg for a total of twelve degrees of freedom. A black battery box sits on the central body, held in place with green elastic bands, which seems like a quick and serviceable way to keep the weight centred. Up front there is a small OLED display that renders animated pixel eyes, and during operation the eyes blink and change expression, which gives the machine a lot of character for such a tiny screen.



The electronics look tidy. Power comes from two 18650 Li-ion cells, and an XL4015 step-down module supplies 5V to a Nano expansion shield. Control is handled by an ESP32-C3 that hosts a web interface at 192.168.4.1, titled 'SPIDER ROBOT ROBOTICS CONTROL SYSTEM'. It has directional buttons such as 'FORWARD' and 'STOP', plus action buttons including 'HAND SHAKE' and 'HAND WAVE'. Pressing the directional commands produces coordinated walking and turning gaits, and the legs hold together well while doing it.



One thing still open in my view: with everything running off those two cells, how long a session lasts before a recharge has not been stated. For a build this capable, that number would be worth knowing.


This is a clean setup. I am curious about the power side: how does the maker feed the servos and the logic from the same pack? Is the 5V rail only for the controller, or do the twelve servos draw from it as well? With that many motors, the supply choice matters a lot.

From what the maker has shared, the robot runs on two 18650 Li-ion batteries, and an XL4015 step-down module supplies 5V to a Nano expansion shield. How the servo load is split across that rail has not been said, so whether the servos share the same 5V line or tap the pack directly is not something we know yet.

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