#define BLYNK_TEMPLATE_ID "TMPL3M1ryAygj"
#define BLYNK_TEMPLATE_NAME "EV Parameters Monitoring"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Blynk Auth Token
char auth[] = "V1rmG5iCxIl2PsAD3FJsfa6SI5vPrPh7";
// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Define pins
const int voltagePin = 34; // GPIO pin for voltage potentiometer
const int currentPin = 35; // GPIO pin for current potentiometer
const int tempPin = 36;    // GPIO pin for temperature potentiometer

// OLED display width and height
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Create an instance of the OLED display
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize the display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Connect to WiFi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize Blynk
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  // Read sensor values
  int voltageValue = analogRead(voltagePin);
  int currentValue = analogRead(currentPin);
  int tempValue = analogRead(tempPin);
  
  // Convert sensor values to meaningful units
  float voltage = voltageValue * (3.3 / 4095.0); // Voltage in volts
  float current = currentValue * (3.3 / 4095.0); // Simulated current in amps
  float temperature = tempValue * (3.3 / 4095.0) * 100.0; // Simulated temperature in degrees Celsius

  // Display values on the OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Battery Voltage: ");
  display.print(voltage);
  display.println(" V");
  display.println("Battery Current: ");
  display.print(current);
  display.println(" A");
  display.println("Battery Temp: ");
  display.print(temperature);
  display.println(" C");
  display.display();

  // Print to serial monitor
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  Serial.print("Current: ");
  Serial.print(current);
  Serial.println(" A");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");

  // Send data to Blynk
  Blynk.virtualWrite(V0, voltage);
  Blynk.virtualWrite(V1, current);
  Blynk.virtualWrite(V2, temperature);

  // Run Blynk
  Blynk.run();

  delay(1000);
}