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// La broche numérique 2 est reliée à la led verte 1. On lui donne le nom ledverte1.
int ledverte1 = 2;
// Etc ...
int ledverte2 = 3;
int ledverte3 = 4;
int ledorange4 = 5;
int ledorange5 = 6;
int ledorange6 = 7;
int ledrouge7 = 8;
int ledrouge8 = 9;
int ledrouge9 = 10;

void setup() {
  // Définit ledverte1 soit la broche numérique 2 comme sortie.
  pinMode (ledverte1, OUTPUT);
  // Etc ...
  pinMode (ledverte2, OUTPUT);
  pinMode (ledverte3, OUTPUT);
  pinMode (ledorange4, OUTPUT);
  pinMode (ledorange5, OUTPUT);
  pinMode (ledorange6, OUTPUT);
  pinMode (ledrouge7, OUTPUT);
  pinMode (ledrouge8, OUTPUT);
  pinMode (ledrouge9, OUTPUT);
}

void loop() {
  // Met la broche numérique stockée dans ledverte1 sur ON
  digitalWrite (ledverte1, HIGH);
  // On attend 100 millisecondes
  delay(100);
  // Met la broche numérique stockée dans ledverte2 sur OFF
  digitalWrite (ledverte1, LOW);
  // Etc ...
  delay(100);
  digitalWrite (ledverte2, HIGH);
  delay(100);
  digitalWrite (ledverte2, LOW);
  delay(100);
  digitalWrite (ledverte3, HIGH);
  delay(100);
  digitalWrite (ledverte3, LOW);
  delay(100);
  digitalWrite (ledorange4, HIGH);
  delay(100);
  digitalWrite (ledorange4, LOW);
  delay(100);
  digitalWrite (ledorange5, HIGH);
  delay(100);
  digitalWrite (ledorange5, LOW);
  delay(100);
  digitalWrite (ledorange6, HIGH);
  delay(100);
  digitalWrite (ledorange6, LOW);
  delay(100);
  digitalWrite (ledrouge7, HIGH);
  delay(100);
  digitalWrite (ledrouge7, LOW);
  delay(100);
  digitalWrite (ledrouge8, HIGH);
  delay(100);
  digitalWrite (ledrouge8, LOW);
  delay(100);
  digitalWrite (ledrouge9, HIGH);
  delay(100);
  digitalWrite (ledrouge9, LOW);
  delay(100);
}