// Wokwi Simulation Code: Arduino Uno & ESP32 with UART Communication + Relay Module
// Arduino Uno: Reads voltage & current from Potentiometer, sends via UART
// ESP32: Reads temperature from DS18B20, displays on OLED, controls buzzer, LED, and relay

// --- Arduino Uno Code ---
#include <Wire.h>

const int potPin1 = A0; // Potentiometer for Voltage
const int potPin2 = A1; // Potentiometer for Current

void setup() {
    Serial.begin(115200); // UART Communication with ESP32
}

void loop() {
    int voltageValue = analogRead(potPin1);
    int currentValue = analogRead(potPin2);
    
    float voltage = voltageValue * (5.0 / 1023.0); // Convert to 0-5V scale
    float current = currentValue * (5.0 / 1023.0); // Simulated current value
    
    Serial.print(voltage);
    Serial.print(",");
    Serial.println(current);
    
    delay(1000);
}

// --- ESP32 Code ---
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
#define ONE_WIRE_BUS 4  // DS18B20 Data Pin
#define BUZZER 18       // Buzzer Pin
#define LED 5           // LED Pin
#define RELAY 23        // Relay Control Pin

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
    Serial.begin(115200);
    sensors.begin();
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
    display.clearDisplay();
    pinMode(BUZZER, OUTPUT);
    pinMode(LED, OUTPUT);
    pinMode(RELAY, OUTPUT);
    digitalWrite(RELAY, LOW); // Ensure relay is OFF initially
}

void loop() {
    sensors.requestTemperatures(); 
    float temperature = sensors.getTempCByIndex(0);
    
    if (Serial.available()) {
        String data = Serial.readStringUntil('\n');
        float voltage, current;
        sscanf(data.c_str(), "%f,%f", &voltage, &current);
        
        display.clearDisplay();
        display.setTextSize(1);
        display.setTextColor(SSD1306_WHITE);
        
        display.setCursor(0, 0);
        display.print("Voltage: "); display.print(voltage, 2); display.print("V");
        
        display.setCursor(0, 10);
        display.print("Current: "); display.print(current, 2); display.print("A");
        
        display.setCursor(0, 20);
        display.print("Temp: "); display.print(temperature, 2); display.print("C");
        
        display.display();
        
        if (temperature > 50.0) { // Example high temp alert
            digitalWrite(BUZZER, HIGH);
            digitalWrite(LED, HIGH);
            digitalWrite(RELAY, HIGH); // Turn ON relay
        } else {
            digitalWrite(BUZZER, LOW);
            digitalWrite(LED, LOW);
            digitalWrite(RELAY, LOW); // Turn OFF relay
        }
    }
    
    delay(1000);
}