int relay1 = 8;
int relay2 = 7;
volatile byte relayState1 = LOW;
volatile byte relayState2 = LOW;

int PIRInterrupt1 = 2;
int PIRInterrupt2 = 1;

long lastDebounceTime1 = 0;  
long debounceDelay1 = 10000;
long lastDebounceTime2 = 0;
long debounceDelay2 = 10000;

void setup() {

  pinMode(relay1, OUTPUT);
  digitalWrite(relay1, HIGH);
  pinMode(relay2, OUTPUT);
  digitalWrite(relay2, HIGH);
  
  pinMode(PIRInterrupt1, INPUT);
  pinMode(PIRInterrupt2, INPUT);
  
  attachInterrupt(digitalPinToInterrupt(PIRInterrupt1), detectMotion, RISING);
  attachInterrupt(digitalPinToInterrupt(PIRInterrupt2), detectMotion, RISING);

  Serial.begin(9600);
  Serial.begin(9600);
}

void loop() {
  
  if((millis() - lastDebounceTime1) > debounceDelay1 && relayState1 == HIGH){
    digitalWrite(relay1, HIGH);
    relayState1 = LOW;
    Serial.println("OFF");
  }
  delay(50);
  if((millis() - lastDebounceTime2) > debounceDelay2 && relayState2 == HIGH){
    digitalWrite(relay2, HIGH);
    relayState2 = LOW;
    Serial.println("OFF");
    }
  delay(50);
}

void detectMotion() {
  Serial.println("Motion");
  if(relayState1 == LOW){
    digitalWrite(relay1, LOW);
  }
  relayState1 = HIGH;  
  Serial.println("ON");
  lastDebounceTime1 = millis();
  
  Serial.println("Motion");
  if(relayState2 == LOW){
    digitalWrite(relay2, LOW);
  }
  relayState2 = HIGH;
  Serial.println("ON");
  lastDebounceTime2 = millis();
}