Hi, i am going to build a digital synth with a raspberry Pi 3 and Arduino Uno.
The idea with the Arduino is that it handles 16 rotary encoders and 4 display spi to visualize the levels of each encoder and send to rasberry the level of each encoder.
From what I was reading, with a multiplexer you can manage those 16 potentiometers.
My question arises if I can use 4 display (for example through SPI? is it possible? which one do you recommend to use? Is the arduino capable of handling 4 displays of 1.44 or 1.8 and 16 rotary encodersr?
Each display it would show 4 encoders info. (title and level).
I looked in aliexpress some display options (like this https://es.aliexpress.com/item/32844104782.html or this Tablero de módulo de pantalla LCD IPS TFT a todo Color, serie 3,3 V, 1,44, 1,8 pulgadas, 128x128, 128x160, 65K SPI, reemplaza OLED ST7735|Módulos de LCD| - AliExpress)
What is the difference between 4pin and 7 pin?
Any recommendation is welcome