#define ds 2
#define clk 3
#define latch 4

void setup() {
  pinMode(ds, OUTPUT);
  pinMode(clk, OUTPUT);
  pinMode(latch, OUTPUT);

}

void loop() {
  setLed(0,1);

}

void shiftOut(char val)
{
  for (char i = 0; i <=8; i++)  {
    digitalWrite(ds, !!(val & (1 << (7 - i))));
    digitalWrite(clk, HIGH);
    digitalWrite(clk, LOW);
  }
}


char byte1, byte2, byte3;
#define setbit(x,y) x|= (1<<y)
#define clearbit(x,y) x&= ~(1<<y)

void setLed(char index, bool level) {
  if (index <= 8)
    write(byte1 ,index,level);
  if (index <= 16)
    write(byte2,index, level);
  if (index <= 32)
    write(byte3,index, level);

    digitalWrite(latch,0);
    shiftOut(byte3);
    shiftOut(byte2);
    shiftOut(byte1);
    digitalWrite(latch,1);
}

void write(char b,char i, bool l) {
  if (l)setbit(b, i);
  if (!l)clearbit(b, i);
}