// Smart Light Pins
int ldrPin = 34;
int pirPin = 26;
int lightLed = 25;

// Smart Dustbin Pins
int trigPin = 5;
int echoPin = 18;
int binLed = 13;

// Threshold values
int lightThreshold = 3000;   // Dark condition
int binThreshold = 15;       // Bin full distance (cm)

void setup() {
  Serial.begin(115200);

  pinMode(ldrPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(lightLed, OUTPUT);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(binLed, OUTPUT);

  Serial.println("Smart Home Automation Started");
}

void loop() {

  // -------- SMART LIGHT --------
  int ldr = analogRead(ldrPin);
  int pir = digitalRead(pirPin);

  Serial.print("LDR: ");
  Serial.print(ldr);
  Serial.print("  PIR: ");
  Serial.println(pir);

  if (pir == 1 && ldr > lightThreshold) {
    digitalWrite(lightLed, HIGH);
    Serial.println("Light ON");
  } else {
    digitalWrite(lightLed, LOW);
    Serial.println("Light OFF");
  }

  // -------- SMART DUSTBIN --------
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2;

  Serial.print("Dustbin Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance > 0 && distance <= binThreshold) {
    digitalWrite(binLed, HIGH);
    Serial.println("Dustbin FULL");
  } else {
    digitalWrite(binLed, LOW);
    Serial.println("Dustbin NOT FULL");
  }

  Serial.println("------------------");
  delay(1000);
}