“Open source custom circuit board that uses an ESP8266 to capture packets on the current WiFi channel, and display the intensity on 8 LEDs.
At its core, this board design is a simple desk toy that connects an ESP8266 module to a shift register to display data on the 8 blue LEDs.To make things a little bit more interesting, I’ve written an Arduino sketch that measures how many packets are flying around on the ESP’s WiFi channel, and displaying the intensity on the LEDs much like a VU meter.”