Smart robot dog based on Arduino nano (schematic diagram + PCB)

PCBbot, a smart robot dog made entirely of PCBs What is it? Can you build a robot entirely out of PCBs? This was the question I asked myself when I decided to build this robot. It is a small robot dog built entirely with PCBs, the idea behind the design was to make a small, clean, smart and powerful robot dog that everyone can use readily available components such as servo motors, Arduino and, and other readily available electronics, that is why I did not use SMD components. Since the robot is built with PCBs, the vast majority of connections between components can be integrated into the robot structure, leaving only wired connections between the leg joints. The robot is equipped with an hc05 bluetooth module that allows it to be controlled via a smartphone, and all the code is handled by a small Arduino nano that controls 8 mg90s servo motors. This robot dog also has a lot of features, in fact, not only does it walk, but it is also able to know when its feet touch the ground, thanks to the rotating feet that act as little buttons, which will make it easier for this dog to traverse rough terrain without getting stuck or tipping over. The robot also has a module bay to which various modules can be attached to further expand the functionality of this puppy, such as a robotic arm or obstacle avoidance sensors. How was it built? The coolest thing about this robot is that since it is built with PCBs, manufactured, so they can be assembled by soldering the individual PCBs together with the help of 0.8 mm solid copper wire; this way, when connecting the structural parts of the robot, you will also make the necessary electrical connections that connect all the electronic components together. Therefore, the only tools you need to assemble this little robot dog are a soldering iron, some pliers and wire strippers. In order to make this robot cheaper and easier for everyone to use, I combined all the individual PCBs required to build this robot into three larger PCBs that can be ordered separately for cheaper PCBs, unfortunately, to do this you will have to cut the PCBs yourself with a scroll saw (or similar), but this will not take more than a few hours