DoggoBot is my trial and error attempt to build a 4 legged walking robot as simply as possible. The brain is an Arduino Nano and it controls 4 metal gear servo motors, one for each leg. I've left plenty of room to connect a variety of sensors.
The parts can be laser cut or cut by hand. I've designed them in a way to only need a few basic shapes of different sizes to create all the parts. Basically just a set of rectangles and a few parallelgrams.
The code is simple as well. The Arduino controls each servo in a sequence to have the legs move back in forth. The timing of the sequence allows the robot to become off balance and move forward or walk.
Instructions and all part files can be found at my Github page.