A foreign user created a cool DIY project using the Raspberry Pi: by monitoring network traffic, an Earth globe composed of multiple LEDs lights up in real-time, visually demonstrating the status of data packet transmission.
1: Data Collection
This project requires not only the Raspberry Pi but also an ESP32 module. Using the open-source tool ESP32-WiFi-Sniffer, it captures data packets from the Wi-Fi network and transmits this data to the Raspberry Pi via Wi-Fi.
2: Raspberry Pi Processing
The Raspberry Pi receives the data transmitted by the ESP32 and runs a Python script to parse the type, size, and frequency of the data packets. Based on predefined rules, the script generates signals to control the brightness, flashing frequency, and color of the LEDs.
3: Expanding Control Capability
The number of GPIO pins on the Raspberry Pi is limited, making it impossible to control a large number of LEDs directly. Therefore, a custom PCB is needed to expand its control capabilities, utilizing the TLC5916 driver module, which is an LED driver chip that can precisely control the brightness and color of multiple LEDs.
4: Globe Framework
The globe is composed of 12 pentagonal and 30 hexagonal joints connecting 60 wooden rods. The joints are made through 3D printing, supporting the framework and fixing the fiber optic cables.
5: Role of Fiber Optic Cables
Fiber optic cables connect the LEDs, evenly conducting the emitted light into the interior of the globe to avoid direct strong light stimulation, creating a soft dynamic light and shadow effect, while enhancing overall aesthetics.
One could say that the hands-on ability is strong, and the theoretical knowledge is impressive.