#define BLYNK_TEMPLATE_ID "TMPL3TYI-VeYV"
#define BLYNK_TEMPLATE_NAME "Electric vehicle project"
#define ONE_WIRE_BUS 4  

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal.h>

// Initialize the LiquidCrystal library with the pins
LiquidCrystal lcd(0, 17, 5, 19, 23, 15);

char auth[] = "FxVBo9s6_m4aiDfI8tci1nZbmBgl4jxD";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int voltagePin = 34;
const int currentPin = 35;
const int warningLED = 16;
const int relayPin = 18;
const float voltageConversionFactor = 3.3 / 4095.0;
const float currentConversionFactor = 3.3 / 4095.0;

OneWire oneWire(4);
DallasTemperature sensors(&oneWire);

// Define battery characteristics for SoC calculation
const float minVoltage = 10.0;  // Minimum battery voltage
const float maxVoltage = 13.2;  // Maximum battery voltage

void setup() {




  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Start.....!");
  Serial.begin(115200);
  sensors.begin();

  // Initialize the LCD
  

  delay(1000);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (1);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  pinMode(warningLED, OUTPUT);
  digitalWrite(warningLED, LOW);

  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);

  // Initialize WiFi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");

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

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Battery Manager");
  display.display();
  delay(2000);

  // Display WiFi connected message on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WiFi Connected");
  Serial.println("WiFi Connected message displayed on LCD");
}

void loop() {
  Blynk.run();

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("WiFi disconnected, trying to reconnect...");
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("Reconnected to WiFi");
  }

  int voltageValue = analogRead(voltagePin);
  float batteryVoltage = voltageValue * voltageConversionFactor * 4;

  int currentValue = analogRead(currentPin);
  float batteryCurrent = currentValue * currentConversionFactor;

  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0) + 150;

  // Calculate battery State of Charge (SoC) based on voltage
  float batterySoC = map(batteryVoltage, minVoltage, maxVoltage, 0, 100);
  // Ensure SoC is constrained within 0-100%
  batterySoC = constrain(batterySoC, 0, 100);

  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Voltage: ");
  display.print(batteryVoltage);
  display.print(" V");

  display.setCursor(0, 10);
  display.print("Current: ");
  display.print(batteryCurrent);
  display.print(" A");

  display.setCursor(0, 20);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");

  display.setCursor(0, 30);
  display.print("SoC: ");
  display.print(batterySoC);
  display.print(" %");

  display.display();

  Blynk.virtualWrite(V0, batteryVoltage);
  Blynk.virtualWrite(V1, batteryCurrent);
  Blynk.virtualWrite(V2, temperature);
  Blynk.virtualWrite(V4, batterySoC); // Assuming V4 is used for SoC

 

  

  // Check for battery alerts based on thresholds
  if (batteryVoltage < 3.0 || batteryCurrent > 2.0 || temperature > 60.0) {
    digitalWrite(warningLED, HIGH);
    Blynk.virtualWrite(V3, 255);
    Serial.println("Warning: Battery Alert!");
    

  
    lcd.clear(); 
    lcd.setCursor(0, 0);
    lcd.print("Battery alert");
    

    digitalWrite(relayPin, LOW); 
  } else {
    digitalWrite(warningLED, LOW);
    Blynk.virtualWrite(V3, 0);
    Serial.println("Battery is in Good Condition!");
    
    lcd.clear();  // Clear the LCD before printing new message
    lcd.setCursor(0, 0);  // Set cursor to top-left position
    lcd.print("Good Condition");
    
    digitalWrite(relayPin, HIGH);
  }

  delay(1000);
}