Petoi’s Quaddle robot dog turns four servos into a programmable little walker

Petoi’s new Quaddle is a palm-sized robot dog built around a neat mechanical trick: each leg uses one servo and a spring-loaded linkage to move both the shoulder and knee. The result is a small robot that can walk, glide and be programmed, rather than just sit on a desk looking knowingly at its owner.

Watch Desk analysis

What happened

Yanko Design reports that Quaddle weighs about six ounces, assembles without screws and has a LEGO-compatible back. Petoi says its OpenCat framework powers the robot. Depending on the model, owners can teach movements by physically guiding the legs, use drag-and-drop coding, or move on to Python, MicroPython, Arduino C++ and ROS. The article says deliveries are due to begin in December.

Our top picks

• One servo per leg
  A spring and four-bar linkage let one motor drive both the shoulder and knee, reducing the number of servos.
• Teach it by moving it
  On Buddy and Scout, owners can record a movement by guiding the robot’s legs, then refine it in Petoi’s Skill Composer software.
• Room to grow into coding
  The programming path runs from beginner-friendly blocks through Python and Arduino C++ to ROS.
• A simulator before the robot
  A browser-based simulator runs the same code as the real robot, according to the article, so projects can be tested without the hardware.
• A physical AI switch on some models
  Buddy and Scout include an AI chip for voice chat and smart-home control, with a slide switch to cut its power.

Why it matters

Quaddle makes robotics more approachable without reducing it to a toy that only performs a fixed routine. The combination of hands-on movement, progressively more advanced coding and ROS support could make it useful for learning as well as tinkering. Its compact linkage also gives builders a tangible example of how mechanical design can do the work of an extra motor.

Our read

The strongest feature here is not the backflip. It is the route from “move this leg” to “write code that makes the whole robot do something”. That is a more inviting robotics lesson than starting with a wall of documentation. The article describes Petoi’s claims and tabletop demonstrations, not a broad independent performance test, so treat the speed and climbing figures as demonstrations rather than lab benchmarks.

What to watch

• Whether deliveries begin on the December schedule.
• Which programming and teaching features are available on each model.
• How well the linkage performs beyond Petoi’s tabletop demonstrations.

Discussion spark: For a first robotics project, is a robot that can be taught by hand a better starting point than one that begins with coding?

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