#define LDR_PIN 32            // LDR connected to A0

#define POT_PIN 35          // Potentiometer connected to A1

#define BUTTON_PIN 4         // Push Button connected to D15

#define LED1_PIN 12            // LED1 connected to D5

#define LED2_PIN 14           // LED2 connected to D18

#define LED3_PIN 13           // LED3 connected to D19
 
int ledState = LOW;           // Current state of LEDs

bool ldrWorking = true;       // Assume LDR is working initially

bool buttonPressed = false;   // Track button state for manual mode
 
void setup() {

  pinMode(LED1_PIN, OUTPUT);

  pinMode(LED2_PIN, OUTPUT);

  pinMode(LED3_PIN, OUTPUT);

  pinMode(BUTTON_PIN, INPUT_PULLUP); // Use internal pull-up resistor

  Serial.begin(115200);       // Debugging purposes

}
 
void loop() {

  // Read LDR value

  int ldrValue = analogRead(LDR_PIN);

  int potValue = analogRead(POT_PIN); // Read potentiometer value (0-4095)
 
  // Map potentiometer value to PWM range (0-255)

  int brightness = map(potValue, 0, 4095, 0, 255);
 
  // Check if LDR is functional

  if (ldrValue < 100 || ldrValue > 4000) {

    ldrWorking = false; // Assume LDR is not working if values are extreme

  } else {

    ldrWorking = true;

  }
 
  // Check button state

  if (digitalRead(BUTTON_PIN) == LOW) {

    delay(50); // Debounce

    if (!buttonPressed) {

      buttonPressed = true;

      ledState = !ledState; // Toggle LEDs

    }

  } else {

    buttonPressed = false;

  }
 
  // Control LEDs

  if (ldrWorking) {

    if (ldrValue < 600) { // Daytime threshold

      ledState = LOW; // Turn off LEDs

    } else {          // Nighttime threshold

      ledState = HIGH; // Turn on LEDs

    }

  }

  // Set LED brightness and state

  analogWrite(LED1_PIN, ledState ? brightness : 0);

  analogWrite(LED2_PIN, ledState ? brightness : 0);

  analogWrite(LED3_PIN, ledState ? brightness : 0);
 
  // Debugging

  Serial.print("LDR: "); Serial.print(ldrValue);

  Serial.print(" | POT: "); Serial.print(potValue);

  Serial.print(" | LDR Working: "); Serial.print(ldrWorking);

  Serial.print(" | LEDs: "); Serial.println(ledState ? "ON" : "OFF");
 
  delay(100);

}