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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int potPin1 = A0;
const int potPin2 = A1;
const int potPin3 = A2;
const int currentDevider = 100;

const int lghtButton = 2;
const int backlightPin = 3;

int buttonState = 0;
int lastButtonState = HIGH;

int stringStart, stringEnd = 0;
int scrollCursor = 16;

void setup() {

  pinMode(lghtButton, INPUT_PULLUP);
  pinMode(backlightPin, OUTPUT);

  lcd.begin(16, 2);
  lcd.setBacklight(10);

  String line1 = ".               Made in SPINDO Karawang Factory by Jikun Mtc";
  String line2 = "Loading...";

  lcd.setCursor(0, 0);
  lcd.print("SIGNAL ISOLATOR");
  lcd.setCursor(5, 1);
  lcd.print("TESTER");
  delay(3000);
  lcd.clear();
  
  lcd.print(line1.substring(0, 16));

    for (int i = 0; i <= line1.length() -0 ; i++) {
      lcd.clear();
    
      lcd.setCursor(0, 0);
      lcd.print(line1.substring(i, i + 16));

      lcd.setCursor(0, 1);
      lcd.print(line2);

      delay(200);
    }
    delay(100);
    lcd.clear();

    lcd.setCursor(0, 0);
    lcd.print("Dikopian heula");
    lcd.setCursor(0, 1);
    lcd.print("biar fokus");
    delay(2000);
    lcd.setBacklight(0);
    lcd.clear();
  
}

void loop() {
  buttonState = digitalRead(lghtButton);

  if (buttonState != lastButtonState) {
    if (buttonState == LOW) {
      if (digitalRead(backlightPin) == HIGH) {
        digitalWrite(backlightPin, LOW);
        lcd.setBacklight(0);
      } else {
        digitalWrite(backlightPin, HIGH);
        lcd.setBacklight(10);
      }
      delay (50);
    }
  }

  int potValue1 = analogRead(potPin3);
  int potValue2 = analogRead(potPin2);
  int potValue3 = analogRead(potPin1);

  float voltage1 = potValue1 * (15.2 / 1023.0);
  float current = potValue2 * (30.3 / 1023.0);
  float voltage3 = potValue3 * (15.2 / 1023.0);

  if(voltage1 > 9.99){
    lcd.setCursor(2,0);
    lcd.print(voltage1, 1);
  }
  else{
    lcd.setCursor(2, 0);
    lcd.print(voltage1, 2);
  }

  if(current > 9.99){
    lcd.setCursor(2, 1);
    lcd.print(current, 1);
  }
  else{
    lcd.setCursor(2, 1);
    lcd.print(current, 2);
  }

  if(voltage3 > 9.99){
    lcd.setCursor(11, 0);
    lcd.print(voltage3, 1);
  }
  else{
    lcd.setCursor(11, 0);
    lcd.print(voltage3, 2);
  }

  lcd.setCursor(0, 0);
  lcd.print("X:");
  lcd.setCursor(9, 0);
  lcd.print("Z:");
  lcd.setCursor(0, 1);
  lcd.print("Y:");

  lcd.setCursor(6, 0);
  lcd.print("V");
  lcd.setCursor(15, 0);
  lcd.print("V");
  lcd.setCursor(6, 1);
  lcd.print("mA");
  
  delay(100);

}