int relay_1 = 6;
int pir_1 = 7;
int pir_2 = 8;
int pir_3 = 9;
int val_relay_1 = 0;
int val_1 = 0;
int val_2 = 0;
int val_3 = 0;

void setup() {
Serial.begin(9600);
pinMode(relay_1, OUTPUT);
pinMode(pir_1, INPUT);
pinMode(pir_2, INPUT);
pinMode(pir_3, INPUT);
}

void loop() {
//digitalRead(pir_2);
//val_2 = digitalRead(pir_2);
//digitalRead(relay_1);
val_relay_1 = digitalRead(relay_1);
if (val_relay_1 == LOW) {
  digitalRead(pir_1);
  val_1 = digitalRead(pir_1);
  if (val_1 == HIGH) {
  Serial.println("capteur_1 on");
  digitalWrite(relay_1, HIGH);
  delay(5000);
  }
}
digitalWrite(relay_1, LOW);
}