#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Inisialisasi LCD 20x4
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 20, 4);

// Definisi Pin
#define trigerPin 32
#define echoPin 35
#define pirPin 33
#define ldrPin 25 

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

  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(ldrPin, INPUT);

  LCD.init();
  LCD.backlight();
  
  // Tampilan Awal
  LCD.setCursor(0, 0);
  LCD.print("SYSTEM MONITORING");
  delay(1000);
  LCD.clear();
}

void loop() {
  float jarak = readDistanceHCSR04();

  int statusGerak = digitalRead(pirPin);


  int nilaiCahaya = analogRead(ldrPin); 

  // --- TAMPILAN LCD ---

  // Baris 0: Jarak
  LCD.setCursor(0, 0);
  LCD.print("Jarak  : ");
  LCD.print(jarak);
  LCD.print(" cm   ");

  // Baris 1: Gerakan
  LCD.setCursor(0, 1);
  LCD.print("Gerak  : ");
  if (statusGerak == HIGH) {
    LCD.print("ADA PERGERAKAN");
  } else {
    LCD.print("TIDAK ADA     ");
  }

  // Baris 2: Cahaya
  LCD.setCursor(0, 2);
  LCD.print("Cahaya : ");
  LCD.print(nilaiCahaya);
  LCD.print("      ");

  // Baris 3: Status Lingkungan (Logika Tambahan)
  LCD.setCursor(0, 3);
  if (nilaiCahaya < 1500) {
    LCD.print("Kondisi: TERANG   ");
  } else {
    LCD.print("Kondisi: GELAP    ");
  }

  delay(500); 
}

float readDistanceHCSR04() {
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);
  int duration = pulseIn(echoPin, HIGH);
  return duration * 0.034 / 2;
}