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 */

void setup() {
 
 for(int i = 2; i<8; i++)
{
 pinMode(i, OUTPUT);
} 
 
  pinMode(dataPin1, OUTPUT);
  pinMode(clockPin1, OUTPUT);
  pinMode(latchPin1, OUTPUT);
  pinMode(dataPin2,  OUTPUT);
  pinMode(clockPin2, OUTPUT);
  pinMode(latchPin2, OUTPUT);
}

int pattern1 = 0b10101010;
int pattern2 = 0b01101010;
void loop() {
  digitalWrite(latchPin1, LOW);
  digitalWrite(latchPin2, LOW);
  shiftOut(dataPin1, clockPin1, LSBFIRST, pattern1);
  shiftOut(dataPin2, clockPin2, LSBFIRST, pattern2);
  digitalWrite(latchPin1, HIGH);
  digitalWrite(latchPin2, HIGH);
  delay(1000);
  //pattern1 = ~pattern2; // Invert the pattern
}