Thursday, March 7, 2013

Mini Cadaces 8 by 10 LED to Arduino

I have written some code to work with the small 8 by 10 LED array boards made by Cadaces/Signature Electronic signs.  Here is a picture of one of them working:
Here is the code for the Arduino to make it work, the interface is that same as was used in previous posts.


//****************************************************//
//  Name    : Cadaces Driver                          //
//  Author  : Bob Davis                               //
//  Date    : 23 February, 2013                       //
//  Version : 1.0                                     //
//****************************************************//
// Pins for the row drivers
int row1Pin = 1;
int row2Pin = 2;
int row3Pin = 3;
int rowEnable = 4;
int rclockPin = 5;
int clockPin = 6;
int dataPin = 7;
int gdataPin = 8;
// Set the pins to output to the sign
void setup() {
  pinMode(row1Pin, OUTPUT);
  pinMode(row2Pin, OUTPUT);
  pinMode(row3Pin, OUTPUT);
  pinMode(rowEnable, OUTPUT);
  pinMode(rclockPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(gdataPin, OUTPUT);
}

//=== Character Array ===
// Characters are A, B, C, etc.  Only upper case, no symbols. 
byte alphabets[][8] = {
  {0, 04, 10, 17, 17, 31, 17, 17}, //A
  {0, 30, 17, 17, 30, 17, 17, 30}, //B
  {0, 14, 17, 16, 16, 16, 17, 14}, //C
  {0, 28, 18, 17, 17, 17, 18, 28}, //D
  {0, 31, 16, 16, 31, 16, 16, 31}, //E
  {0, 31, 16, 16, 31, 16, 16, 16}, //F
  {0, 14, 17, 16, 16, 19, 17, 14}, //G
  {0, 17, 17, 17, 31, 17, 17, 17}, //H
  {0, 14, 04, 04, 04, 04, 04, 14}, //I
  {0, 07, 02, 02, 02, 02, 10, 14}, //J
  {0, 17, 18, 20, 24, 20, 18, 17}, //K
  {0, 16, 16, 16, 16, 16, 16, 31}, //L
  {0, 10, 21, 21, 21, 17, 17, 17}, //M
  {0, 17, 25, 25, 21, 19, 19, 17}, //N
  {0, 14, 17, 17, 17, 17, 17, 14}, //O
  {0, 30, 17, 17, 30, 16, 16, 16}, //P
  {0, 14, 17, 17, 17, 17, 19, 15}, //Q
  {0, 30, 17, 17, 30, 20, 18, 17}, //R
  {0, 14, 17, 16, 14, 01, 17, 14}, //S
  {0, 31, 04, 04, 04, 04, 04, 04}, //T
  {0, 17, 17, 17, 17, 17, 17, 14}, //U
  {0, 17, 17, 17, 10, 10, 10, 04}, //V
  {0, 17, 17, 17, 21, 21, 21, 10}, //W
  {0, 17, 17, 10, 04, 10, 17, 17}, //X
  {0, 17, 10, 10, 04, 04, 04, 04}, //Y
  {0, 31, 8, 04, 02, 04, 8, 31}, //Z
  {0, 0, 21, 14, 31, 14, 21, 0}, //*
};
byte bitmap[][8] = {  //red characters
  {0, 0,0,0,0,0,0,0},
  {0, 17, 17, 17, 31, 17, 17, 17}, //H
};
byte gbitmap[][8] = { //green characters
  {0, 14, 04, 04, 04, 04, 04, 14}, //I
  {0, 0,0,0,0,0,0,0},
};
void RunSign()
{
  for (int row = 7; row > 0; row--)
  {
    // turn off display
    digitalWrite(rowEnable, HIGH);
    digitalWrite(rclockPin, LOW);
    // send serial data to display 2 = number of characters
    for (int character = 0; character < 2; character++)
    {
      for (int shiftbit = 5; shiftbit >=0; shiftbit--){
    if bitRead(gbitmap[character][row],shiftbit) digitalWrite(gdataPin, HIGH);
else digitalWrite(gdataPin, LOW);
    if bitRead(bitmap[character][row],shiftbit) digitalWrite(dataPin, HIGH);
else digitalWrite(dataPin, LOW);
    digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW);
      }
    }
    //latch the data
    digitalWrite(rclockPin, HIGH);
    // set up 74138 row sesection and turn display back on
    if bitRead(row,0) digitalWrite (row1Pin, HIGH); else digitalWrite(row1Pin, LOW); 
    if bitRead(row,1) digitalWrite (row2Pin, HIGH); else digitalWrite(row2Pin, LOW);
    if bitRead(row,2) digitalWrite (row3Pin, HIGH); else digitalWrite(row3Pin, LOW);
    digitalWrite(rowEnable, LOW);
    // Wait to see what we sent to the display ;
    delayMicroseconds(500);
  }


//=== L O O P ===
void loop() {
  RunSign();
}

1 comment:

Alex Walker said...

useful coding ..something really innovative...thanks for Sharing..Keep It Up!!!

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