// By D.Weerasinghe @COTM
// You are not allowed to change the wiring. 
// test script is wirtten to identify the pins connected to each segment
// make a program to display 00 to 99, 100 numbers in the SSDs
// You may copy from the previous programs and change them as required.

const int dataPin1 = 2;   /* DS */
const int clockPin1 = 3;  /* SHCP */
const int latchPin1 = 4;  /* STCP */
const int dataPin2 = 5;   /* DS */
const int clockPin2 = 6;  /* SHCP */
const int latchPin2 = 7;  /* STCP */

int patternA = 0b00000001;

int patternB = 0b10000000;

int patternA8 = 0b01111111;
int patternA0 = 0b01110111;

void setup() {

  pinMode(dataPin1, OUTPUT);
  pinMode(clockPin1, OUTPUT);
  pinMode(latchPin1, OUTPUT);
  pinMode(dataPin2, OUTPUT);
  pinMode(clockPin2, OUTPUT);
  pinMode(latchPin2, OUTPUT);

// Test SSD connections
  for (int i=0; i < 8; i++){
  digitalWrite(latchPin1, LOW);
  digitalWrite(latchPin2, LOW);
  shiftOut(dataPin1, clockPin1, LSBFIRST, patternA);
  shiftOut(dataPin2, clockPin2, LSBFIRST, patternB);
  digitalWrite(latchPin1, HIGH);
  digitalWrite(latchPin2, HIGH);
  patternA = patternA << 1;
  patternB = patternB >> 1;
  delay(10);
  }

  digitalWrite(latchPin1, LOW);
  shiftOut(dataPin1, clockPin1, LSBFIRST, patternA8);
  digitalWrite(latchPin1, HIGH);
  delay(100);
  digitalWrite(latchPin1, LOW);
  shiftOut(dataPin1, clockPin1, LSBFIRST, patternA0);
  digitalWrite(latchPin1, HIGH);

}


void loop() {
  /*
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, pattern);
  digitalWrite(latchPin, HIGH);
  delay(500); */
  //pattern = ~pattern; // Invert the pattern
  
}