This project is a 3D printed geodesic dome hooked up with flashing LEDs and fiber optic cables to visualize the nearby network activity, it looks pretty cool in the dark.
I used an ESP-32 in promiscuous mode to sniff WiFi packets and get their MAC addresses, and 40 individually addressable LEDs that flash when a packet is detected.
To assemble the geodesic sphere, I printed 30 x hexagonal joints and 12 x pentagonal joints. They are joined with 3/16" wooden dowels, cut 60 dowels 155 mm long and 60 dowels 164 mm long.
The 3D files can be found on my thingiverse here. I used ~75 m of 1.5 mm side glow fiber optic cable, each fiber optic cable is connected to the PCB holder, onto each LED, then routed around the 3D printed joints to create a web pattern. The fiber optics are held in place with crazy glue.
The KiCad PCB schematics can be found in pcb.zip, I had it made with JLC PCB.
On the board I soldered 40 x SMD5730 white LEDs, these are controlled by 5 x TLC5916 LED sink drivers. The TLC5916s are controlled by a Raspberry Pi.
The Pi and the TLC5916s are powered by a 5V wall power adapter, that power is also used by a buck converter to bring it down to 3.2 V for the LEDs.
The code for the ESP-32 can be found in ./wifiSniffer/WifiSniffer.ino, the code is from ESP-EOS/ESP32-WiFi-Sniffer. The ESP-32 is connected to the Raspberry Pi by USB, it prints detected WiFi packets to serial, and the Python script on the Raspberry Pi reads it.
After connecting the ESP-32 to the Pi and running main.py the intercepted packets will print in the terminal
And that's it, enjoy the light show!