Recently, three students from the University of California, Davis, created an innovative self-rolling robotic ball using 3D printing technology. This smart device is designed to track electronic signals from wearable devices attached to a person's ankle, allowing it to follow its owner like a loyal puppy. The team named their invention "Naughty Ball" due to its playful and interactive behavior.
The main goal of the project was to develop a robot that could operate independently without the need for a traditional remote control. The team found existing handheld controllers limiting, as they restricted user movement and interaction. By eliminating the need for a physical controller, they aimed to create a more natural and intuitive experience.
To achieve this, the team integrated infrared tracking and indoor positioning systems. These technologies allow the robotic ball to detect the user’s location and navigate the environment accordingly. Inside the ball, a mechanical system adjusts the center of gravity, enabling the robot to move toward or away from the user as needed.
During development, the team considered two main approaches for tracking the user. The first involved using an infrared sensor from a Wiimote to detect an emitter on the user’s wrist or ankle. The second used Bluetooth technology for indoor positioning. Ultimately, they combined these methods to enhance accuracy and responsiveness.
The ball moves smoothly using an internal gyroscope, eliminating the need for external force. It features a two-wheel balance robot housed inside a transparent plastic shell. A built-in battery powers the ballast and stepper motor, while 3D-printed wheels help with balancing and movement. Most of the electronics are placed in the upper part of the sphere for better weight distribution.
The team also added a BeagleBone Black board, which connects a WiFi adapter, motor drivers, and a 3D-printed bracket. This setup allows thermal imaging cameras to be mounted inside the ball, helping it track the user through an infrared ankle bracelet.
Each Naughty Ball has its own unique personality. Some versions actively seek out users, while others prefer to avoid them. According to the team, "Some balls will roll up to your legs—like a pet dog—but others will move away as you approach." The ball can also interact with users by changing colors and making sounds when it makes contact, reflecting its "mood."
The project was completed with a budget under $200. The cost breakdown included $40 for tools, $50 for hardware components, $40 for the 3D printer and mechanical parts, and $60 for motors and sensors. Despite the low cost, the team managed to create a highly functional and engaging robotic companion.
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