Shift register code from http://bildr.org/2011/02/74hc595/

75HC595.ino

  /*
 * Shift register code from
 * http://bildr.org/2011/02/74hc595/
 */

int SER_Pin = 8; //pin 14 on the 75HC595
int RCLK_Pin = 9; //pin 12 on the 75HC595
int SRCLK_Pin = 10; //pin 11 on the 75HC595

//How many of the shift registers – change this
#define number_of_74hc595s 1

//do not touch
#define numOfRegisterPins number_of_74hc595s * 8

boolean registers[numOfRegisterPins];

void setup() {
  pinMode(SER_Pin, OUTPUT);
  pinMode(RCLK_Pin, OUTPUT);
  pinMode(SRCLK_Pin, OUTPUT);

  //reset all register pins
  clearRegisters();
  writeRegisters();
}

//set all register pins to LOW
void clearRegisters(){
  for (int i = numOfRegisterPins- 1; i >= 0; i--)
  {
    registers[i] = LOW;
  }
}

//Set and display registers
//Only call AFTER all values are set how you would like (slow otherwise)
void writeRegisters()
{
  digitalWrite(RCLK_Pin, LOW);
  for(int i=numOfRegisterPins-1;i>=0;i--)
  {
    digitalWrite(SRCLK_Pin, LOW);
    int val = registers[i];
    digitalWrite(SER_Pin, val);
    digitalWrite(SRCLK_Pin, HIGH);
  }
  digitalWrite(RCLK_Pin, HIGH);
}

//set an individual pin HIGH or LOW
void setRegisterPin(int index, int value)
{
  registers[index] = value;
}

void loop() {
  setRegisterPin(2, HIGH);
  setRegisterPin(3, HIGH);
  setRegisterPin(4, LOW);
  setRegisterPin(5, HIGH);
  setRegisterPin(7, HIGH);
  writeRegisters(); //MUST BE CALLED TO DISPLAY CHANGES
  //Only call once after the values are set how you need.
}