/* BLYNK CONNECTION INSTRUCTION
  V0:level
  V1:TEMPERATURE
  V2:pressure
  V3:maxlevel
  V4:maxtemp
  V5:maxPressure
  V6:minlevel
  V7:
*/


#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL2yZMhyJYW"
#define BLYNK_TEMPLATE_NAME "IOT BASED FUEL TANK MONITORING"
#define BLYNK_AUTH_TOKEN "7oExtXypvElg2a1XKZPhxCg6HSF7DmSY"

#define led3       23
#define led1       19
#define led2       18
#define buzzer     4
#define triggerPin 26
#define echoPin    25

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <HCSR04.h>
#include <LiquidCrystal_I2C.h>

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

LiquidCrystal_I2C lcd(0x27,20,4);
HCSR04 hc(triggerPin,echoPin);

String alert1="HIGH TEMPERATURE",alert2="HIGH PRESSURE",alert3="OVER FLOW",alert4="LOW FUEL";
float Temperature,Pressure,Level,volume;
float maxTemperature=30,maxPressure=85,maxLevel=95,minLevel=5;
const int tankHeight=400;
const float radius=100,length=500;
const float pi=3.14;

void setup()
{
  lcd.init();                  
  lcd.backlight();
  loadingdisplay();
  
  Serial.begin(115200);
 
  pinMode(led3,OUTPUT);
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(buzzer,OUTPUT);
  digitalWrite(buzzer,LOW);

  Blynk.begin(auth, ssid, pass);
  Blynk.virtualWrite(V3,maxLevel);
  Blynk.virtualWrite(V4,maxTemperature);
  Blynk.virtualWrite(V5,maxPressure);
  digitalWrite(led3,HIGH);
  digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
}

void loop()
{
 Blynk.run();
 get_data();
 send_update();
 homedisplay();
 if(Temperature >= maxTemperature)
 {
    Blynk.virtualWrite(V6,HIGH);
    Blynk.virtualWrite(V7,alert1);
    digitalWrite(led1,LOW);
    digitalWrite(led2,HIGH);
    alert_display(alert1);
    Alert(3);
 }

 if(Pressure >= maxPressure)
 {
    Blynk.virtualWrite(V6,HIGH);
    Blynk.virtualWrite(V7,alert2);
    digitalWrite(led1,LOW);
    digitalWrite(led2,HIGH);
    alert_display(alert2);
    Alert(3);
 }
 
  if(Level >= maxLevel)
 {
    Blynk.virtualWrite(V6,HIGH);
    Blynk.virtualWrite(V7,alert3);
    digitalWrite(led1,LOW);
    digitalWrite(led2,HIGH);
    alert_display(alert3);
    Alert(3);
 }

  if(Level <= minLevel)
 {
    Blynk.virtualWrite(V6,HIGH);
    Blynk.virtualWrite(V7,alert4);
    digitalWrite(led1,LOW);
    digitalWrite(led2,HIGH);
    alert_display(alert4);
    Alert(3);
 }
 digitalWrite(led1,HIGH);
 digitalWrite(led2,LOW);
}

BLYNK_WRITE(V3)
{
  int data=param.asInt();
  if(data!= maxLevel)
  {
    maxLevel=data;
  }
}

BLYNK_WRITE(V4)
{
  int data=param.asInt();
  if(data!= maxTemperature)
  {
    maxTemperature=data;
  }
}

BLYNK_WRITE(V5)
{
 int data=param.asInt();
  if(data!= maxPressure)
  {
    maxPressure=data;
  }
}

BLYNK_WRITE(V6)
{
 int data=param.asInt();
  if(data!= minLevel)
  {
    minLevel=data;
  }
}

void get_data() 
{
  Level =map((tankHeight-(hc.dist())),tankHeight,0,0,100);
  if(radius==Level)
  {
    volume=0.5*pi*sq(Level)*length;
    volume=volume/1000;
  }
  else if(Level < radius)
  {
    volume=( (sq(radius)*acos((radius-Level)/radius)) - ((radius-Level)*sqrt(2*radius*Level-sq(Level))))*length;
     volume=volume/1000;
  }
  else if(Level > radius)
  {
    volume=(((Level-radius)*sqrt(2*radius*Level-sq(Level)))+ (sq(radius)*(pi-2*acos((Level-radius)/radius))))*length;
     volume=volume/1000;  
  }
  Temperature =map(analogRead(34),0,4095,0,50);
  Pressure =map(analogRead(35),0,4095,0,100);
}

void send_update() 
{     
  Blynk.virtualWrite(V0,volume);
  Blynk.virtualWrite(V1,Temperature);
  Blynk.virtualWrite(V2,Pressure);
  delay(150);  
}

void loadingdisplay()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("*FUEL STORAGE TANK*"); 
  lcd.setCursor(0,1);
  lcd.print("*   MONITORING    *"); 
  lcd.setCursor(0,2);
  lcd.print(" SYSTEM INITIALIZE ");
  lcd.setCursor(0,3);
  lcd.print("PLEASE WAIT");
  for(int k=11;k<20;k++)
  {
    lcd.setCursor(k,3);
    lcd.print(".");
    delay(500);
  }
}

void homedisplay()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("-FUEL TANK ANALYSIS-"); 
  lcd.setCursor(0,1);
  lcd.print("F.VOLUME:"); 
  lcd.setCursor(9,1);
  lcd.print(volume,1);
  lcd.print("L");
  lcd.setCursor(0,2);
  lcd.print("F.TEMP:");
  lcd.setCursor(9,2);
  lcd.print(Temperature,1);
  lcd.print("°C");
  lcd.setCursor(0,3);
  lcd.print("PRESSURE:");
  lcd.setCursor(9,3);
  lcd.print(Pressure,1);
  lcd.print("%");
  delay(500);
}

void alert_display(String textAlert)
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(" -EMERGENCY ALERT-  ");
  lcd.setCursor(0,1);
  lcd.print("********************");
  lcd.setCursor(0,2);
  lcd.print("*");
  lcd.setCursor(1,2);
  lcd.print(textAlert);
  lcd.setCursor(19,2);
  lcd.print("*");
  lcd.setCursor(0,3);
  lcd.print("********************");

}

void Alert(uint8_t num)
{
  for(num;num>0;num--)
  {
    digitalWrite(buzzer,HIGH);
    delay(750);
    digitalWrite(buzzer,LOW);
    delay(500);
  }
}