led.ino

led.ino

int n = 4; 
int sum =0 ;

void setup() {

  for (int i = 0; i < n; i++) {
    pinMode(10+ i, OUTPUT); 
  }


  for (int i = 1 ; i <= n-1 ; i++){
    sum += i;
  }
  
  for (int i = 0; i < sum; i++) { 
    pinMode(i, OUTPUT); 
  }


  for (int kk =0 ; kk < sum ; kk++){
          digitalWrite(kk, LOW);    
  }


  for (int kk =0 ; kk < n ; kk++){
      digitalWrite(10 + kk, LOW);    
  }

}

void loop() {


for (int i = 0; i < n-1; i++){
  for (int j = i + 1 ; j < n; j++){
    for (int k = 0 ; k < sum ; k++){
      if (k != i + int( 0.5*(j-1-i)*(2*n-j +i) )) {
        digitalWrite(k, LOW);
      }else{
        digitalWrite(k, HIGH);
      }
    }
    
    for (int kk = 0 ; kk < n ; kk++){
     if (kk != i && kk != j) {
        digitalWrite(10+kk, LOW);      
     }else{
        digitalWrite(10+kk, HIGH);      
     }
    }
    
  delay(1000); 
  }
}

delay(1000);

}