[tacon]

I have a bunch of large 10" LCD "atomic" wall clocks that use WWVB for time information. I want to retrofit something like an ESP32 running NTP. I can never find any specs on how to drive the (non-standard) LCD segments with numbers and icons. Has anyone reverse engineered one of those?

[dmitrygr]

driving raw LCDs is not hard, but tedious as you need a large (3, 4, or 5 depending on MUX settings) number of drive voltages. You are MUCH better using a chip that has a native LCD driver. Microchip has a bunch of 8-bit PICs that do. And then you can talk to it using SPI or UART from your ESP32. As for pinout - just guess and check the rows and cols. It won't take long.