WiFi-2-OIP-UI

This is a WiFi display built on a salvaged board from an obsolete Octalarm-IP alarm system. A custom PCB swaps in an ESP32-S2. The 128x64 LCD and its 20 red and 20 green LEDs get a second life as an MQTT-driven status panel.

What's on the board

• A custom KiCad PCB carrying the ESP32-S2.
• 128x64 LCD with an NT7534 controller.
• 20 red and 20 green LEDs, plus backlight.
• A 3D-printed stand, if you want it off the bench.

The data path

The ESP32-S2 joins WiFi and connects to an MQTT broker, subscribing to `clockall/solartime`. It draws the payload on the LCD over SPI. The ATmega48 firmware, embedded in the ESP32 image, is flashed over the same bus and keeps running the LED and backlight rows. The ATmega48 stays on LED duty. Rewiring forty LEDs to the ESP32 was not worth it.