#include <Arduino.h>
#include <LiquidCrystal.h>

const int rs = 4, en = 5, d4 = 18, d5 = 19, d6 = 21, d7 = 22;  // pin numbers of the lcd display
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);                     // object of the lcd display

bool st_1 = false;     // state for button press led1
bool mode_st = false;  // state for button press mode
bool st = false;       // state for button press led2

int last_val = 0;  // detecting change in lux value

void setup() {
  Serial.begin(115200);           // configuring the baud rate
  pinMode(12, OUTPUT);             // LED pin configuration
  pinMode(14, OUTPUT);             // LED pin configuration
  pinMode(2, INPUT_PULLUP);        // button pin configuration
  pinMode(23, INPUT_PULLUP);       // button pin configuration
  pinMode(15, INPUT_PULLUP);       // button pin configuration
  lcd.begin(16, 2);                // configuring the lcd display size
}

void loop() {
  int a = analogRead(34);  // taking reading from LDR sensor
  int b = map(a, 32, 4063, 0, 255);  // converting sensor data into a 0 to 255 value

  int e = digitalRead(15);  // taking reading from mode button

  if (e == 0) {
    mode_st = !mode_st;
    delay(100);
  }

  if (mode_st) {
    if (last_val != b) {
      analogWrite(12, b);         // change brightness of LED according to the sensor value
      analogWrite(14, b);         // change brightness of LED according to the sensor value
      Serial.print("Automatic Mode Light LUX:");  // display the reading on the serial monitor
      Serial.println(map(a, 32, 4058, 100, 0));   // display the reading on the serial monitor percentages of light lux
      lcd.setCursor(0, 0);
      lcd.print("Automatic Mode");  // display the sensor data
      lcd.setCursor(0, 1);                          // position of the text on display
      lcd.print("Light LUX: ");                     // display the sensor data
      lcd.print(map(a, 32, 4058, 100, 0));          // display the sensor percentage
      lcd.print("%    ");                              // display the unit of the sensor
    }
  }
  while (mode_st == false) {
    int c = digitalRead(2);   // taking reading from button 1
    int d = digitalRead(23);  // taking reading from button 2
    lcd.setCursor(0, 0);      // position of the text on display
    lcd.print("Manually:       ");
    if (c == 0) {
      st = !st;
      delay(10);
    }
    if (d == 0) {
      st_1 = !st_1;
      delay(10);
    }

    if (digitalRead(15) == 0 && mode_st == false) {
      lcd.setCursor(0, 0);
      lcd.print("Automatic Mode");
      lcd.setCursor(0, 1);  // position of the text on display
      lcd.print("                 ");
      mode_st = true;
      delay(100);
      break;
    }
    if (st) {
      lcd.setCursor(0, 1);  // position of the text on display
      lcd.print("LED1 ON ");
      analogWrite(12, 255);
    } else {
      lcd.setCursor(0, 1);  // position of the text on display
      lcd.print("LED1 OFF");
      analogWrite(12, 0);
    }
    if (st_1) {
      lcd.setCursor(8, 1);  // position of the text on display
      lcd.print("LED2 ON ");
      analogWrite(14, 255);
    } else {
      lcd.setCursor(8, 1);  // position of the text on display
      lcd.print("LED2 OFF");
      analogWrite(14, 0);
    }
  }
  last_val = b;  // recorded the previous sensor data
  delay(100);    // this speeds up the simulation
}