const int pirPin = 2;        // PIR sensor output pin
const int relayPin = 3;      // Relay module control pin
const int feedDuration = 5000; // Feed dispensing time in milliseconds (5 seconds)

void setup() {
  pinMode(pirPin, INPUT);      // Set PIR sensor pin as input
  pinMode(relayPin, OUTPUT);   // Set relay control pin as output
  digitalWrite(relayPin, LOW); // Ensure relay is off initially
  Serial.begin(9600);          // Initialize serial communication for debugging
  Serial.println("Bird Feeder System Ready.");
}

void loop() {
  int motionDetected = digitalRead(pirPin); // Read PIR sensor state

  if (motionDetected == HIGH) {             // If motion is detected
    Serial.println("Motion detected! Dispensing feed...");
    digitalWrite(relayPin, HIGH);           // Activate relay (turn on feeder)
    delay(feedDuration);                    // Dispense feed for set duration
    digitalWrite(relayPin, LOW);            // Deactivate relay (turn off feeder)
    Serial.println("Dispensing complete.");

    // Wait until motion stops to avoid multiple triggers
    while (digitalRead(pirPin) == HIGH) {
      delay(100);                           // Small delay to reduce CPU usage
    }

    Serial.println("Waiting for next motion...");
  }
}