int i;
int a;
void setup() 

{
 pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

  pinMode(2, INPUT_PULLUP);
  Serial.begin(9600);

}

void loop() {
for(i=1;i<11;i++){
  a=digitalRead(2);
Serial.print(a);Serial.println();
if(a==0) {digitalWrite(9,HIGH);boton();}
else {digitalWrite(9, LOW);}
  digitalWrite(8, HIGH);
  delay(1500);
  digitalWrite(8, LOW);
  delay(1500);
}
}
void boton(){
Serial.print("bouton on");Serial.println();
return;
}