int led1 = 3;
int led2 = 5;
int led3 = 6;
int led4 = 9;
int led5 = 10;
int motionLed = 11;




int ldr = 8;
int t = 4;
int echo = 7;





unsigned long motionTime = 0;
bool motionDetected = false;

int ledBrightness[5] = {255, 255, 255, 255, 255};
unsigned long motionLedDuration = 5000; 

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(motionLed, OUTPUT);

  pinMode(ldr, INPUT);
  pinMode(t, OUTPUT);
  pinMode(echo, INPUT);

  Serial.begin(9600);
}

void loop() {
  int light = digitalRead(ldr);

  // --- Trigger Ultrasonic Pulse ---
  digitalWrite(t, LOW);
  delayMicroseconds(2);
  digitalWrite(t, HIGH);
  delayMicroseconds(10);
  digitalWrite(t, LOW);

  // --- Read Echo ---
  long duration = pulseIn(echo, HIGH, 20000);  // Timeout after 20ms
  float distance = duration * 0.034 / 2;

  // --- LDR Controlled LEDs ---
  if (light == HIGH) {
    analogWrite(led1, ledBrightness[0]);
    analogWrite(led2, ledBrightness[1]);
    analogWrite(led3, ledBrightness[2]);
    analogWrite(led4, ledBrightness[3]);
    analogWrite(led5, ledBrightness[4]);
  } else {
    analogWrite(led1, 0);
    analogWrite(led2, 0);
    analogWrite(led3, 0);
    analogWrite(led4, 0);
    analogWrite(led5, 0);
  }

  // --- Motion Detection ---
  if (distance > 0 && distance < 20) {
    motionDetected = true;
    motionTime = millis();
  }

  if (motionDetected && millis() - motionTime < motionLedDuration) {
    analogWrite(motionLed, 255); 
  } else {
    analogWrite(motionLed, 0); 
    motionDetected = false;
  }

  // --- Serial Commands ---
  if (Serial.available()) {
    char command = Serial.read();
    if (command == 'O') {
      int ledNumber = Serial.parseInt();
      forceLedOn(ledNumber);
    } else if (command == 'F') {
      int ledNumber = Serial.parseInt();
      forceLedOff(ledNumber);
    } else if (command == 'B') {
      int ledNumber = Serial.parseInt();
      int brightness = Serial.parseInt();
      changeLedBrightness(ledNumber, brightness);
    } else if (command == 'R') {
      readSensorStatuses();
    } else if (command == 'T') {
      motionLedDuration = Serial.parseInt() * 1000;
      if (motionLedDuration < 1000) {
        motionLedDuration = 1000;
      }
      Serial.print("Motion LED duration set to: ");
      Serial.println(motionLedDuration / 1000);
    }
  }

  delay(100);
}

void forceLedOn(int ledNumber) {
  if (ledNumber == 1) digitalWrite(led1, HIGH);
  else if (ledNumber == 2) digitalWrite(led2, HIGH);
  else if (ledNumber == 3) digitalWrite(led3, HIGH);
  else if (ledNumber == 4) digitalWrite(led4, HIGH);
  else if (ledNumber == 5) digitalWrite(led5, HIGH);
  else if (ledNumber == 6) digitalWrite(motionLed, HIGH);
}

void forceLedOff(int ledNumber) {
  if (ledNumber == 1) digitalWrite(led1, LOW);
  else if (ledNumber == 2) digitalWrite(led2, LOW);
  else if (ledNumber == 3) digitalWrite(led3, LOW);
  else if (ledNumber == 4) digitalWrite(led4, LOW);
  else if (ledNumber == 5) digitalWrite(led5, LOW);
  else if (ledNumber == 6) digitalWrite(motionLed, LOW);
}

void changeLedBrightness(int ledNumber, int brightness) {
  if (brightness >= 0 && brightness <= 255) {
    if (ledNumber == 1) ledBrightness[0] = brightness;
    else if (ledNumber == 2) ledBrightness[1] = brightness;
    else if (ledNumber == 3) ledBrightness[2] = brightness;
    else if (ledNumber == 4) ledBrightness[3] = brightness;
    else if (ledNumber == 5) ledBrightness[4] = brightness;
  }
}

void readSensorStatuses() {
  int light = digitalRead(ldr);

  // Send ultrasonic pulse again for accuracy
  digitalWrite(t, LOW);
  delayMicroseconds(2);
  digitalWrite(t, HIGH);
  delayMicroseconds(10);
  digitalWrite(t, LOW);

  long duration = pulseIn(echo, HIGH, 20000);
  float distance = duration * 0.034 / 2;

  Serial.print("LDR: ");
  Serial.print(light == HIGH ? "HIGH" : "LOW");
  Serial.print(", Motion: ");
  if (distance > 0 && distance < 20) {
    Serial.println("Motion Detected");
  } else {
    Serial.println("No Motion");
  }
}