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  Max-Felix Müller • 05/10/2019 at 22:33 • 0 comments

  Here is the completed working code for a random pattern. Nothing special, not efficient or fast at all. But it needed to be done quick since it's a gift for my fathers birthday which is now...

  #define MOS1 8
  #define MOS2 9
  #define MOS3 10
  #define MOS4 11
  
  #define DAT1 0
  #define DAT2 1
  #define DAT3 2
  #define DAT4 3
  #define DAT5 4
  #define DAT6 5
  #define DAT7 6
  #define DAT8 7
  
  #define OE1 A0
  #define OE2 A1
  #define LE1 A2
  #define LE2 A3
  
  void setup() {
    // mosfets
    pinMode(MOS1, OUTPUT);
    pinMode(MOS2, OUTPUT);
    pinMode(MOS3, OUTPUT);
    pinMode(MOS4, OUTPUT);
  
    // data
    pinMode(DAT1, OUTPUT);
    pinMode(DAT2, OUTPUT);
    pinMode(DAT3, OUTPUT);
    pinMode(DAT4, OUTPUT);
    pinMode(DAT5, OUTPUT);
    pinMode(DAT6, OUTPUT);
    pinMode(DAT7, OUTPUT);
    pinMode(DAT8, OUTPUT);
  
    // latch
    pinMode(LE1, OUTPUT);
    pinMode(LE2, OUTPUT);
  
    // disable outpputs
    pinMode(OE1, OUTPUT);
    pinMode(OE2, OUTPUT);
    digitalWrite(OE1, HIGH);
    digitalWrite(OE2, HIGH);
  }
  
  int data1[] = {0, 0, 0, 0};
  int data2[] = {0, 0, 0, 0};
  
  void loop() {
    // make new random data
    for (int i = 0; i < 4; i++) {
      data1[i] = int(random(256));
      data2[i] = int(random(256));
    }
  
    for (int x = 0; x < 10; x++) {
      for (int i = 0; i < 4; i++) {
        // enable outpputs
        digitalWrite(OE1, LOW);
        digitalWrite(OE2, LOW);
  
        // load data1
        if (data1[i] % 2 == 0) {
          digitalWrite(DAT1, HIGH);
        }
        if (data1[i] % 3 == 0) {
          digitalWrite(DAT2, HIGH);
        }
        if (data1[i] % 4 == 0) {
          digitalWrite(DAT3, HIGH);
        }
        if (data1[i] % 5 == 0) {
          digitalWrite(DAT4, HIGH);
        }
        if (data1[i] % 6 == 0) {
          digitalWrite(DAT5, HIGH);
        }
        if (data1[i] % 7 == 0) {
          digitalWrite(DAT6, HIGH);
        }
        if (data1[i] % 8 == 0) {
          digitalWrite(DAT7, HIGH);
        }
        if (data1[i] % 9 == 0) {
          digitalWrite(DAT8, HIGH);
        }
  
        // latch
        digitalWrite(LE1, HIGH);
        delay(1);
        digitalWrite(LE1, LOW);
  
        // reset
        digitalWrite(DAT1, LOW);
        digitalWrite(DAT2, LOW);
        digitalWrite(DAT3, LOW);
        digitalWrite(DAT4, LOW);
        digitalWrite(DAT5, LOW);
        digitalWrite(DAT6, LOW);
        digitalWrite(DAT7, LOW);
        digitalWrite(DAT8, LOW);
  
        // load data2
        if (data2[i] % 2 == 0) {
          digitalWrite(DAT1, HIGH);
        }
        if (data2[i] % 3 == 0) {
          digitalWrite(DAT2, HIGH);
        }
        if (data2[i] % 4 == 0) {
          digitalWrite(DAT3, HIGH);
        }
        if (data2[i] % 5 == 0) {
          digitalWrite(DAT4, HIGH);
        }
        if (data2[i] % 6 == 0) {
          digitalWrite(DAT5, HIGH);
        }
        if (data2[i] % 7 == 0) {
          digitalWrite(DAT6, HIGH);
        }
        if (data2[i] % 8 == 0) {
          digitalWrite(DAT7, HIGH);
        }
        if (data2[i] % 9 == 0) {
          digitalWrite(DAT8, HIGH);
        }
  
        // latch
        digitalWrite(LE2, HIGH);
        delay(1);
        digitalWrite(LE2, LOW);
  
        // reset
        digitalWrite(DAT1, LOW);
        digitalWrite(DAT2, LOW);
        digitalWrite(DAT3, LOW);
        digitalWrite(DAT4, LOW);
        digitalWrite(DAT5, LOW);
        digitalWrite(DAT6, LOW);
        digitalWrite(DAT7, LOW);
        digitalWrite(DAT8, LOW);
  
        // enable mosfet
        if (i == 0) {
          digitalWrite(MOS1, HIGH);
          delay(1);
          digitalWrite(MOS1, LOW);
        } else if (i == 1) {
          digitalWrite(MOS2, HIGH);
          delay(1);
          digitalWrite(MOS2, LOW);
        } else if (i == 2) {
          digitalWrite(MOS3, HIGH);
          delay(1);
          digitalWrite(MOS3, LOW);
        } else if (i == 3) {
          digitalWrite(MOS4, HIGH);
          delay(1);
          digitalWrite(MOS4, LOW);
        }
  
        // disable outpputs
        digitalWrite(OE1, HIGH);
        digitalWrite(OE2, HIGH);
      }
      delay(1);
    }
  }

   If you want only one led to light up, you have to use modulo with prime numbers. Like this, when modulo 4 is zero, modulo 2 will always be zero too.

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