Big RGB Table Finally Needs Code

Projects Programming
41

yeah they are indeed all daisy chained, anodes and cathodes all together. I see what your saying, that does sound easier, but too late now.

Can you post the schematic for the control logic?

What exactly is that? And do you know why this code wouldnt work? Its just the short hand simple version of what i started out doing, and when i look at the values it prints at the end it all checks out, but nothing lights up. no pin changes.

// code for a 36 x 24 array (12 RGB LEDs, 24 columns)

#include <SPI.h>

// set up an array for the cathode drives
byte cathode6[] = { //chip 6, first 3rd of display
  0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
byte cathode7[] = { //chip 7, second 3rd of display
  0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, 0, 0, 0, 0, 0, 0, 0, 0
};
byte cathode8[] = { //chip 8, third 3rd of display
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
};

byte chip5 = 0xFF; //chip values
byte chip4 = 0xFF;
byte chip3 = 0xFF;
byte chip2 = 0xFF;
byte chip1 = 0xFF;

int columncount = 0;
unsigned int time = 500;

const int oe = 10;

void setup(){
  pinMode(oe, OUTPUT);
  digitalWrite(oe, LOW);
  SPI.begin();
  Serial.begin(9600);
}

void loop(){
  //we have to transfer out the cathodes first
  SPI.transfer(cathode8[columncount]);
  SPI.transfer(cathode7[columncount]);
  SPI.transfer(cathode6[columncount]);
  columncount = columncount + 1; // update for next column
  if (columncount == 24){
  columncount = 0; // reset if reach the end
  }
  //transfer out those colors
  SPI.transfer(chip5);
  SPI.transfer(chip4);
  SPI.transfer(chip3);
  SPI.transfer(chip2);
  SPI.transfer(chip1);
  Serial.println(cathode8[columncount], HEX);
  Serial.println(cathode7[columncount], HEX);
  Serial.println(cathode6[columncount], HEX);
  Serial.println(chip5, HEX);
  Serial.println(chip4, HEX);
  Serial.println(chip3, HEX);
  Serial.println(chip2, HEX);
  Serial.println(chip1, HEX);
  delay(time);
} // end void loop