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

const int voltagePin = A0;
const int currentPin = A1;
const int buttonPin = 2;

LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD address and dimensions

int displayMode = 0; // 0: voltage, 1: current, 2: power

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(buttonPin, INPUT);

// Welcome Screen
  lcd.setCursor(0, 0);
  lcd.print("Pakk Tech");
  delay(1000);
  lcd.setCursor(0, 1);
  lcd.print("MPPT Max 60V 60A");
  delay(1500);
  lcd.clear();
}

void loop() {
  int buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    // Toggle display mode
    displayMode = (displayMode + 1) % 3;
    delay(50); // debounce
    lcd.clear();
  }

  // Display selected mode
  if (displayMode == 0) {
    // Display solar voltage
    int voltageValue = analogRead(voltagePin);
    float voltage = voltageValue * (5.0 / 1024.0);
    lcd.setCursor(0, 0);
    lcd.print("Solar: ");
    lcd.print(voltage);
    lcd.print("V");
  } else if (displayMode == 1) {
    // Display solar current
    int currentValue = analogRead(currentPin);
    float current = currentValue * (5.0 / 1024.0);
    lcd.setCursor(0, 0);
    lcd.print("Battery: ");
    lcd.print(current);
    lcd.print("A");
  } else {
    // Display solar power
    int voltageValue = analogRead(voltagePin);
    float voltage = voltageValue * (5.0 / 1024.0);
    int currentValue = analogRead(currentPin);
    float current = currentValue * (5.0 / 1024.0);
    float power = voltage * current;
    lcd.setCursor(0, 0);
    lcd.print("Load: ");
    lcd.print(power);
    lcd.print("W");
  }
  delay(1000);
}