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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int potPin = A0;
const int ledPin = 2;
const float resistorValue = 100.0;

void setup() {
  Serial.begin(9600);
  
  lcd.init();
  lcd.backlight();
  
  pinMode(ledPin, OUTPUT);
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("");
}

void loop() {
  int sensorValue = analogRead(potPin);
  float voltage = sensorValue * (5.0 / 1023.0);
  float current = voltage / resistorValue;
  float power = voltage * current;
  if (voltage > 4.0) {
    digitalWrite(ledPin, LOW);
   
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("LED ON");
  } else {
    digitalWrite(ledPin, HIGH);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("LED OFF");
  }

  Serial.print("VOLT: ");
  Serial.print(voltage, 2);
  Serial.println("V");
  
  Serial.print("ARUS: ");
  Serial.print(current, 4);
  Serial.println("A");

  Serial.print("DAYA: ");
  Serial.print(power, 4);
  Serial.println("W");
  
  delay(1000);
}