#include <LiquidCrystal_I2C.h>

// Define pin constants
const int ledPin = 13;
const int pirPin = 12;
const int ldrPin = 7;

int pirState = LOW;
int val = 0;

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(pirPin, INPUT);
  pinMode(ldrPin, INPUT);

  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.print("LAMPU OTOMATIS");
  lcd.setCursor(2, 1);
  lcd.print("RADIFAN RF");
  delay(2000);
  lcd.clear();
}

void displayMessage(const char *line1, const char *line2, int delayTime = 0) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(line1);
  lcd.setCursor(0, 1);
  lcd.print(line2);
  delay(delayTime);
}

void loop() {
  val = digitalRead(pirPin);

  if (val == LOW && digitalRead(ldrPin) == LOW) {
    // No motion and it's bright
    digitalWrite(ledPin, LOW);
    displayMessage("JL. Kemuning", "", pirState == HIGH ? 3000 : 0);
    pirState = LOW;
  } else if (val == HIGH && digitalRead(ldrPin) == LOW) {
    // Motion detected and it's bright
    digitalWrite(ledPin, LOW);
    if (pirState == LOW) {
      displayMessage("Hati-Hati", "Di Jalan", 3000);
      pirState = HIGH;
    }
  } else if (val == HIGH && digitalRead(ldrPin) == HIGH) {
    // Motion detected and it's dark
    digitalWrite(ledPin, HIGH);
    if (pirState == LOW) {
      displayMessage("Hati-Hati", "Di Jalan", 3000);
      pirState = HIGH;
    }
    digitalWrite(ledPin, LOW);
  } else {
    // No motion detected
    displayMessage("JL. Kemuning", "", 0);
  }
}