There are plenty of cool hexapod, quadruped, and humanoid robots that you can buy to start robot programming. As Toglefritz shares on Instructables, you can also 3D print and build your own quadruped robot. It has 4 legs, each actuated by 3 servos. It also has a NeoPixel LED ring that functions as its eye.
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The robot is made using off-the-shelf electronic components and 3D printed parts. It can be controlled using a PS2 controller. You are going to need Hitec HS-645MG servos, 1 x Lynxmotion Botboarduino, 1 SSC-32 servo controller, and a few other parts to start building this.
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