Robotic fish are the latest innovation in low-maintenance aquarium pets, offering a unique blend of entertainment and convenience. But what makes these mechanical swimmers truly fascinating is the intricate engineering behind their design and functionality. The project, led by Filip and Peter of CPSdrone, showcases a remarkable level of creativity and technical prowess. The challenge was to create a robotic fish that not only looks convincing but also functions seamlessly within an aquarium environment. The team's approach involved meticulous attention to detail, from the materials used to the intricate mechanisms that power the fish's movement and charging system.
One of the key challenges was achieving a waterproof design. The team had to ensure that every component, from the Arduino Pro Mini brain to the ultra-micro brushed motors, fit within a tiny, waterproof hull while maintaining stability underwater. They overcame this by using a combination of OnShape design and Formlabs Form 4 SLA resin printing, resulting in smooth, detailed shells that even included tiny propellers. The two-piece hull design, sealed with an O-ring, and the use of UV-curable resin around cable exits further enhanced the fish's waterproof capabilities.
However, waterproofing was not the only hurdle. Pressure testing revealed leaks around motor cable openings, and tiny amounts of epoxy seeped into the brushed motors, causing speed differences. These issues were addressed through iterative design and refinement, ultimately leading to a more robust and reliable system. The team's solution to the charging problem was equally innovative, involving an underwater docking station with inductive charging coils, eliminating the need for exposed electrical contacts that could corrode.
The intelligence behind these robotic fish is not confined to the fish themselves. A Raspberry Pi, connected to an overhead camera, tracks ArUco markers mounted on top of each submarine, calculating its position and orientation. This data is then fed into a PID-based control system, enabling the fish to navigate the tank with smooth and natural motion. While perfectly synchronized swarm behaviors are still a work in progress, the fish can already cruise around, dock for charging, and engage in autonomous tag games.
The project's success lies in its ability to combine entertainment and technology. The robotic fish offer a unique experience, providing the visual appeal and relaxation of a traditional aquarium without the maintenance headaches. The team's dedication to overcoming technical challenges has resulted in a product that is both functional and captivating. As the project continues to evolve, it raises intriguing questions about the future of aquatic robotics and the potential for innovative solutions in pet care.
In my opinion, this project is a testament to the power of human ingenuity and creativity. It showcases how technology can be harnessed to enhance our leisure activities, providing a unique and engaging experience. The team's attention to detail and their ability to overcome technical hurdles make this robotic fish a fascinating and impressive achievement. As we continue to explore the possibilities of robotics in various domains, projects like this remind us of the endless potential for innovation and the joy it can bring to our lives.
