twcf.ino

// See http://bildr.org/2011/02/74hc595/
 
 
int SER_Pin = 11;   //pin 14 (Data) on the 75HC595
int RCLK_Pin = 9;  //pin 12 (Latch) on the 75HC595
int SRCLK_Pin = 8; //pin 11 (Clock) on the 75HC595


//How many of the shift registers - change this
#define number_of_74hc595s 8
 
//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 setRegisters(int regs[])
{
  for (int i=0; i < numOfRegisterPins; i++)
  {
    registers[i] = regs[i];
  }
}
 
 
void loop()
{

//  setRegisterPin(1, LOW);

  int regs[] = { 
    1,1,1,1,1,1,1,1,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0,
    1,0,0,0,0,0,0,0};
  setRegisters(regs);
 
 
  writeRegisters();  //MUST BE CALLED TO DISPLAY CHANGES
  //Only call once after the values are set how you need.
}