trying to control 37leds with 5x 74HC595

Using Arduino LEDs and Multiplexing
24

i thank you all for trying to help me out :slight_smile:
but know i figured it out with some help offcourse :slight_smile:

tnx to 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 5 

//do not touch
#define numOfRegisterPins number_of_74hc595s * 8

boolean registers[numOfRegisterPins];

int Randomwaarde;
int del = 5 ;
void setup(){
  pinMode(SER_Pin, OUTPUT);
  pinMode(RCLK_Pin, OUTPUT);
  pinMode(SRCLK_Pin, OUTPUT);

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

  randomSeed(analogRead(3));
  Randomwaarde = random(190, 210);
  Serial.println(Randomwaarde);
}               

//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(){


  for (int x=0; x<=36; x++)
  {
    if (del <= Randomwaarde)
    {
      setRegisterPin(x, HIGH);
      writeRegisters();
      delay(del);
      setRegisterPin(x, LOW);
      writeRegisters();
      del = del +1;
    }
    else
    {
      setRegisterPin(x, HIGH);
      writeRegisters();
      delay(10000);
      setRegisterPin(x, LOW);
      writeRegisters();
      del = 5;

    }

  }
}