#define BP      10
#define VERT    11
#define ORANGE  13
#define ROUGE   12

void setup() 
{

  /* I/O  */
pinMode(BP, INPUT_PULLUP);
pinMode(VERT, OUTPUT);
pinMode(ROUGE, OUTPUT);
pinMode(ORANGE, OUTPUT);

  /* Etat du feu initialement */
digitalWrite(ROUGE,HIGH);
digitalWrite(VERT,LOW);
digitalWrite(ORANGE,LOW);

}

void loop() 
{
  while (digitalRead(BP));
  delay(100);
  while (!digitalRead(BP));
  digitalWrite(ROUGE,LOW);
  digitalWrite(VERT,HIGH);
  digitalWrite(ORANGE,LOW);
  while (digitalRead(BP));
  delay(100);
  while (!digitalRead(BP));
  digitalWrite(ROUGE,LOW);
  digitalWrite(VERT,LOW);
  digitalWrite(ORANGE,HIGH);
  while (digitalRead(BP));
  delay(100);
  while (!digitalRead(BP));
  digitalWrite(ROUGE,HIGH);
  digitalWrite(VERT,LOW);
  digitalWrite(ORANGE,LOW);
}