Found a 1994 dual-trace analog cathode-ray oscilloscope in the corner of the measurement lab gathering cobwebs. Replaced two blown electrolytic capacitors and cleaned the potentiometers with isopropyl alcohol. The green phosphor trace lit up like magic! Testing audio waveforms with it right now.

Left on the 3rd bench after the 11:30 AM Electrical Machines lecture. Has a small blue sticker on the back cover. Handed it over to the lab attendant in Room 212. Identify the serial number or the sticker design to claim it.

If you call `delay(1000)` inside `loop()`, your ESP32 drops incoming WebSocket packets and freezes HTTP server tasks. Instead, pin sensor polling to Core 0 with `xTaskCreatePinnedToCore()` and let the network stack handle incoming requests on Core 1. Dual-core microcontrollers should be treated like concurrent systems!