Hello, I have a project with an UNO and now I’d like (needed) to use also the A4 A5, which are busy with I2C
I’ve seen that an 128x64 dot display can work (in fact I used, but still don’t know how to write on it) with SPI, and then I noticed that my 20x4 also has these pins RS, R/W E.
I use now a MEGA for test and have this
#include <SPI.h> // define spi bus pins #define SLAVESELECT 53 #define SPICLOCK 52 #define DATAOUT 51 //MOSI #define DATAIN 50 //MISO
I think’s it ok, but of course, it doesn’t work, as I came here for help .
Can you please help me? If only let me know if it can work or not, I think it’s ok, as with google have found nothing useful for this.