Pocket watch or network sniffer? Not sure. Both? A portable web server? I haven’t figured it out yet.
Using a recycled LiPo battery from an eCigarette. MakerFocus ESP8266 WiFi dev board with 0.91″ OLED display and charging circuit.
The 3D printer makes iterating though designs easier. A lot of unused parts, but we use them during classes to illustrate the progression of work — it’s not right the first time! Or the 5th!