#define LED_PIN 2      // Connect LED with a resistor to this pin
#define LDR_PIN 4       // Analog pin for LDR
#define PIR_PIN  16     // Digital pin for PIR

int ldrValue = 0;
int pirState = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);
  Serial.println("🌃 Automatic Street Light System Started...");
}

void loop() {
  ldrValue = analogRead(LDR_PIN);      // read LDR
  pirState = digitalRead(PIR_PIN);     // read PIR

  // Print values for debugging
  Serial.print("LDR: ");
  Serial.print(ldrValue);
  Serial.print(" | PIR: ");
  Serial.println(pirState);

  // If it's dark
  if (ldrValue < 1000) {  // adjust threshold based on your LDR
    if (pirState == HIGH) {
      digitalWrite(LED_PIN, HIGH);   // Turn LED on when motion detected
    } else {
      digitalWrite(LED_PIN, LOW);    // Turn LED off when no motion
    }
  } else {
    digitalWrite(LED_PIN, LOW);      // Daytime, keep LED off
  }

  delay(500); // small delay
}