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

#define POT_PIN 34       // Potentiometer connected to GPIO 34 (Analog Input)
#define RELAY_PIN 23     // Relay connected to GPIO 23
#define BUTTON_PIN 18    // Push button connected to GPIO 18
#define LED_PIN 19       // LED Indicator connected to GPIO 19

LiquidCrystal_I2C lcd(0x27, 16, 2);
bool loadState = false;  // Track load ON/OFF state

void setup() {
    Serial.begin(115200);
    
    lcd.init();
    lcd.backlight();
    
    pinMode(RELAY_PIN, OUTPUT);
    pinMode(LED_PIN, OUTPUT);
    pinMode(BUTTON_PIN, INPUT_PULLUP);  // Enable internal pull-up resistor

    lcd.setCursor(0, 0);
    lcd.print(" Load Monitor ");
}

void loop() {
    // Simulate Voltage/Current Sensor with Potentiometer
    int sensorValue = analogRead(POT_PIN);
    float voltage = (sensorValue / 4095.0) * 3.3;  // Convert to Voltage

    // Read Push Button for Manual Load Control
    if (digitalRead(BUTTON_PIN) == LOW) {
        loadState = !loadState;  // Toggle Load State
        digitalWrite(RELAY_PIN, loadState);
        digitalWrite(LED_PIN, loadState);
        delay(300);  // Debounce delay
    }

    // Display Data on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Voltage: ");
    lcd.print(voltage, 2);
    lcd.print("V");

    lcd.setCursor(0, 1);
    lcd.print("Load: ");
    lcd.print(loadState ? "ON " : "OFF");

    Serial.print("Voltage: ");
    Serial.print(voltage);
    Serial.print("V, Load: ");
    Serial.println(loadState ? "ON" : "OFF");

    delay(1000);  // Update every 1 second
}