const byte pinRouge = 25; 
const byte pinJaune = 32; 
const byte pinVert = 33; 
const byte pushbutton = 26; 

unsigned long ledstate = 0; 
byte ledActive;
byte etatBoutonPrecedent = LOW;
int  etatBoutonActuel;
void setup()
{
  Serial.begin(9600);
  pinMode(pinRouge, OUTPUT);
  pinMode(pinJaune, OUTPUT);
  pinMode(pinVert, OUTPUT);
  pinMode(pushbutton, INPUT);

  digitalWrite(pinRouge, LOW);
  digitalWrite(pinJaune, LOW);
  digitalWrite(pinVert, LOW);
}
void loop()
{
  etatBoutonActuel = digitalRead(pushbutton);

  if (etatBoutonActuel != etatBoutonPrecedent)
  {
    ledActive = etatBoutonActuel;

      if (ledActive == HIGH)
      { 
        ledstate ++;
        Serial.print("click num ");
        Serial.println(ledstate);
        if (ledstate == 4){
          ledstate = 0;
        }
      }
  
        if (ledstate == 1){
        digitalWrite(pinRouge, HIGH);
        }
        else digitalWrite(pinRouge, LOW);
        
        if (ledstate == 2){
        digitalWrite(pinJaune, HIGH);
        }
        else digitalWrite(pinJaune, LOW);
        
        if (ledstate == 3){
        digitalWrite(pinVert, HIGH);
        }
        else digitalWrite(pinVert, LOW);
        

  etatBoutonPrecedent = etatBoutonActuel;
  }
}