Use of LCD header to drive piezo buzzer with Klipper firmware when LCD panel removed for Klipperscreen

[xanderphillips]

For SV06 units running Klipper + Klipperscreeen touch screen interface with LCD board removed.

1. Removal of the LCD daughter panel frees up the LCD port on the mainboard.
2. The LCD mainboard has dedicated pins to drive the onboard piezo speaker/buzzer on the stock LCD panel.
3. With the proper configuration set up in Klipper it should be possible to remove the LCD ribbon cable and attach a small transistor driven piezo speaker directly to the LCD port inside the mainboard case and allow Klipper to drive M300 'beep' audible signals.

To do this it would be necessary to determine the correct pins on the LCD panel port, appropriate transistor/resistors to drive a piezo speaker at the available voltages, as well as the appropriate mainboard pins to drive the signals.