#define BLYNK_TEMPLATE_ID           "TMPLqUGcc6I7"
#define BLYNK_DEVICE_NAME           "AG IoT Switch"
#define BLYNK_AUTH_TOKEN            "E73pXWQ2I23F7Al3HnZemyX6W97sSbTD"


// Comment this out to disable prints and save space
#define BLYNK_PRINT Serial


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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino resetpin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


#define TRIGGERPIN 4
#define ECHOPIN    5
#define PUMP       15

char auth[] = BLYNK_AUTH_TOKEN;

long duration, distance, distance1;
float percentage;
int pumpstatus;
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void myTimerEvent()
{
  digitalWrite(TRIGGERPIN, LOW);  
  delayMicroseconds(3); 
  digitalWrite(TRIGGERPIN, HIGH);
  delayMicroseconds(12); // it may be 10 us
  digitalWrite(TRIGGERPIN, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(ECHOPIN, HIGH);
// Calculating the distance
  distance = (duration/2) / 29.1;
  distance1=20-distance;
  percentage = (distance1*100)/15;
  if (distance1 <= 3)
    { 
      digitalWrite(PUMP, HIGH); 
      pumpstatus = 255;
    }
    else if (distance1 >= 14)
      { 
        digitalWrite(PUMP, LOW); 
        pumpstatus = 0;
      }
  Serial.println(" ");
  Serial.print("Free Level : ");
  Serial.print(distance);
  Serial.print(" cm. Water Level: ");
  Serial.print(distance1);
  Serial.print(" cm. ");
  Serial.print(" percentage = ");
  Serial.print(percentage);
  Serial.print(" %");
  Blynk.virtualWrite(3, distance); //virtual pin V3
  Blynk.virtualWrite(2, distance1); //virtual pin V2
  Blynk.virtualWrite(4, pumpstatus); //virtual pin V4
  Blynk.virtualWrite(5, percentage); //virtual pin V5
  delay(500);
}

void setup()
{
  // Debug console
  Serial.begin(115200);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }
  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextSize(1);
  display.drawRoundRect(0, 0, 128, 64, 8, WHITE);
  display.drawRoundRect(5, 5, 118, 54, 8, WHITE);
// Sets the color to black with a white background
  display.setTextColor(WHITE);
  display.setCursor(30,8);
  display.println("WATER LEVEL");
  display.drawLine(6,17,120,17, WHITE);
  display.setCursor(20,20);
  display.println("Please connect");
  display.setCursor(32,30);
  display.println("the wifi...");
  display.drawLine(6,40,120,40, WHITE);
  display.setCursor(33,46);
  display.println("R C C I I T");
  display.display();
  // Debug console
  Serial.begin(115200);
  pinMode(TRIGGERPIN, OUTPUT);
  pinMode(ECHOPIN, INPUT);
  pinMode(PUMP, OUTPUT);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(1000L, myTimerEvent);
  Serial.println(" ");
  Serial.println("Sensing the Water Level");
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);

  // Setup a function to be called every second
  //timer.setInterval(1000L, myTimerEvent);
}

void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
  display.clearDisplay();
  display.setCursor(0,0);
  display.drawRoundRect(0, 0, 128, 64, 8, WHITE);
  display.drawRoundRect(5, 5, 118, 54, 8, WHITE);

// Sets the color to black with a white background
  display.setTextColor(WHITE);
  display.setCursor(30,8);
  display.setTextSize(1);
  display.println("WATER LEVEL");
  display.drawLine(6,17,120,17, WHITE);
  display.setCursor(15,25);
  display.println("LEVEL = ");
  display.setTextSize(2); 
  display.setCursor(65,20);
  display.println(distance1);
  display.setCursor(95,20);
  display.setTextSize(2); 
  display.println("cm");
  
  display.drawLine(6,40,120,40, WHITE);
  display.setCursor(33,46);
  display.setTextSize(1);
  display.println("R C C I I T");
  display.display();      
}