feat: add FREKVENS support

[semicuda]

Added the LED matrix definition for the IKEA FREKVENS cube. Due to almost identical hardware, the project runs just as well on the Frekvens with an ESP32.

https://www.ikea.com/de/de/p/frekvens-multibeleuchtung-led-schwarz-30420354/

[jekkos]

Did you also desolder the original chip as in the instructions here? Or can it be left in place after disconnecting the power from it?

[semicuda]

Did you also desolder the original chip as in the instructions here? Or can it be left in place after disconnecting the power from it?

Yes - I removed the PCB containing the original controller.

[MauiKano]

there is a microphone in the FREKVENS.Its connected to the green PCB opposit to the VCC/GND SCR/CLK etc. pins. I ASSUME the mic pin can go to a analog input of the ESP. Have you tried that ? What is the function of the red/white/black wires going to the SW1/SW2/COM pins on the green PCB? I guess these are the swiches. So SW1 -> GPIOx, SW2 -> GPIOy and COM ?

[MauiKano]

No need to answer my earlier questions. It's clear that SW1 and SW2 are the switches with a common pin which goes to GND (unfortunately that is the red cable). The mic needs a pre-amp which I added and connected the output of the pre-amp to a analog input of the ESP. Not yet sure what to do with it.

However, the FREKVENS addons to the original code works for me and could be merged from my point of view.