Solutions des programmes

 void setup () {
 pinMode(0, OUTPUT);
 pinMode(1, OUTPUT);
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 }
 void loop () {
 for (int i=0; i<10; i++) {
   if( i < 5) { 
     digitalWrite( i, HIGH);
     delay(500);
     digitalWrite( i, LOW);
   }
   else {
     digitalWrite( 9-i, HIGH);
     delay(500);
     digitalWrite( 9-i, LOW);
   
   }
  }
 }

 void setup () {
 pinMode(0, OUTPUT);
 pinMode(1, OUTPUT);
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 }
void loop () {
 for (int i=-4; i<4; i++) {
    digitalWrite( abs(i), HIGH);
    delay(500);
    digitalWrite( abs(i), LOW);
    
 }
}