// LED muj potok

const int lowestPin = 2;      
const int highestPin = 9;
int a=0;
int b=0;
int c=0;
int thisPin=0;     

void setup() {
  // nastavení pinu od 2 do 9 LEDky jako výstupu  
  for(int thisPin = lowestPin;thisPin <= highestPin;thisPin++){
    pinMode(thisPin,OUTPUT);  // nastavení pinu jako výstupu
  }
}

void loop() {
  
  for (thisPin = lowestPin;thisPin <= highestPin;thisPin++) {

    a=thisPin;
    ;
    switch (a) {
      case 2: 
      b = highestPin;
      c = highestPin-1;
      break;
      
      case 3:
      c = highestPin;
      b = lowestPin;
      break;
      
      default:
      b = a-1;
      c = a-2;
      break;
     }

    analogWrite(a,255);
    analogWrite(b,130);
    analogWrite(c,80);

    // zapnout tuto LEDku 
    delay(1000);
    
    analogWrite(a,0);
    analogWrite(b,0);
    analogWrite(c,0);
  }
}