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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address and dimensions
// Define button pins
const int buttonPins[] = {2, 3, 4, 5};

// Resistor color codes
const char* colors[] = {"Black", "Brown", "Red", "Orange", "Yellow", "Green", "Blue", "Violet", "Gray", "White"};

// Variables to store selected colors
int selectedColors[4] = {0}; // Initialize with all colors as Black (0)

void setup() {
  // Set button pins as INPUT_PULLUP
  for (int i = 0; i < 4; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }

  // Initialize the LCD
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Resistor Value:");
}

void loop() {
  // Read button states and update selected colors
  updateSelectedColors();

  // Calculate resistor value
  int resistorValue = (selectedColors[0] * 10 + selectedColors[1]) * selectedColors[2];

  // Display resistor value on LCD
  lcd.setCursor(0, 1);
  lcd.print("                "); // Clear the line
  lcd.setCursor(0, 1);
  lcd.print(resistorValue);
}

void updateSelectedColors() {
  for (int i = 0; i < 4; i++) {
    int buttonState = digitalRead(buttonPins[i]);
    if (buttonState == LOW) {
      // Button is pressed, cycle through colors
      while (digitalRead(buttonPins[i]) == LOW); // Wait for button release
      selectedColors[i] = (selectedColors[i] + 1) % 10; // Cycle through colors 0-9
    }
  }
}