// Project 05 - POD LED LCD
// ------------------------
// Nama : Ahmad Zaky
// Kelas : XII RPL B
// Tanggal : 30/07/2024

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

// Define pins for LEDs and potentiometer
int ledMerah = 2;
int ledKuning = 3;
int ledHijau = 4;
int Potensio = A0;

// Initialize the LCD with I2C address 0x27 and dimensions 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Adjust the address (0x27 or 0x3F) and dimensions (16 columns x 2 rows) as needed

// Variables to hold the last displayed status
String lastStatus = "";
int lastValue = -1;

//---------------------------------------------setup-----------------------------------------
void setup() {
  Serial.begin(115200);
  pinMode(Potensio, INPUT);
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);

  // Initialize the LCD
  lcd.begin(16, 2);  // Initialize with 16 columns and 2 rows
  lcd.backlight();  // Turn on the backlight (if available)
}

//---------------------------------------------loop-----------------------------------------
void loop() {
  int value = analogRead(Potensio);
  Serial.println(value);

  // Determine current status
  String currentStatus;
  if (value >= 0 && value <= 341) {
    digitalWrite(ledMerah, HIGH);    // Turn on red LED
    digitalWrite(ledKuning, LOW);    // Turn off yellow LED
    digitalWrite(ledHijau, LOW);     // Turn off green LED
    currentStatus = "Status: Merah";
  } else if (value >= 342 && value <= 682) {
    digitalWrite(ledMerah, LOW);     // Turn off red LED
    digitalWrite(ledKuning, HIGH);   // Turn on yellow LED
    digitalWrite(ledHijau, LOW);     // Turn off green LED
    currentStatus = "Status: Kuning";
  } else if (value >= 683 && value <= 1023) {
    digitalWrite(ledMerah, LOW);     // Turn off red LED
    digitalWrite(ledKuning, LOW);    // Turn off yellow LED
    digitalWrite(ledHijau, HIGH);    // Turn on green LED
    currentStatus = "Status: Hijau";
  }

  // Only update LCD if status has changed
  if (currentStatus != lastStatus || value != lastValue) {
    lcd.clear();  // Clear LCD only when updating
    lcd.setCursor(0, 0);             // Set cursor to first row
    lcd.print(currentStatus);        // Display status on LCD
    lcd.setCursor(0, 1);             // Set cursor to second row
    lcd.print("Value: ");             
    lcd.print(value);                // Display the potentiometer value

    lastStatus = currentStatus;      // Update last status
    lastValue = value;               // Update last value
  }

  Serial.println(value);  // Print the value to Serial Monitor (for debugging)
  delay(100);  // Delay before the next read
}