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

// Initialize the I2C LCD display (address: 0x27, size: 16x2)
LiquidCrystal_I2C lcd(0x27, 16, 2);

int led1 = 8;  // LED 1 connected to pin 6
int led2 = 7;  // LED 2 connected to pin 7
int led3 = 6;  // LED 3 connected to pin 8

// Analog pins for voltage measurement
int voltPin1 = A0;  // Voltage measurement for LED 1
int voltPin2 = A1;  // Voltage measurement for LED 2
int voltPin3 = A2;  // Voltage measurement for LED 3

int currentLED = 0; // To keep track of the current LED being displayed

void setup() {
  // Set LED pins as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

  // Initialize the LCD display with the correct number of columns and rows
  lcd.begin(16, 2);
  lcd.backlight();  // Turn on the backlight
  
  // Print initial messages on the LCD
  lcd.setCursor(0, 0);  // First row, first column
  lcd.print("LED Status:");
}

void loop() {
  // Turn on the current LED and turn off others
  digitalWrite(led1, currentLED == 0 ? HIGH : LOW);
  digitalWrite(led2, currentLED == 1 ? HIGH : LOW);
  digitalWrite(led3, currentLED == 2 ? HIGH : LOW);
  
  updateLCD();  // Update the LCD with the current LED status and voltage
  delay(1000);  // Wait for 1 second

  // Cycle through LEDs
  currentLED = (currentLED + 1) % 3;  // Move to the next LED
}

// Function to update the LCD with the status and voltage of the LEDs
void updateLCD() {
  lcd.setCursor(0, 1);  // Second row, first column
  
  // Display LED status

  
  // Read voltage for the current LED
  float voltage = 0;
  if (currentLED == 0) {
      lcd.print("L1:"); 
  lcd.print(digitalRead(led1) ? "On " : "Off ");
    voltage = analogRead(voltPin1) * (5.0 / 1023.0);
    lcd.print("V1:");
  } else if (currentLED == 1) {
      lcd.print("L2:"); 
  lcd.print(digitalRead(led2) ? "On " : "Off ");
    voltage = analogRead(voltPin2) * (5.0 / 1023.0);
    lcd.print("V2:");
  } else if (currentLED == 2) {
      lcd.print("L3:"); 
  lcd.print(digitalRead(led3) ? "On " : "Off ");
    voltage = analogRead(voltPin3) * (5.0 / 1023.0);
    lcd.print("V3:");
  }
  
  lcd.print(voltage, 2);  // Print the voltage with 2 decimal places
}