// // #include <Wire.h>
// #include <Adafruit_GFX.h>
// #include <Adafruit_SSD1306.h>

// #define TRIG_PIN 2
// #define ECHO_PIN 3
// #define BUZZER_PIN 13
// // #define LED_PIN = 13

// Adafruit_SSD1306 oled (128, 64);
// // Adafruit_SSD1306 oled (128, 64, &Wire, -1);

// const float tank_empty = 42;
// const float tank_full = 12;
// const float tank_volume = tank_empty - tank_full;

// long duration_pulseMicros = 0;
// int pulse_to_cm = 58;
// int pulse_to_inches = 148;
// int distance_cm = 0;
// int water_level = 0;

// void setup() {
//   // put your setup code here, to run once:
//   Serial.begin(115200);
//   pinMode(TRIG_PIN, OUTPUT);
//   pinMode(ECHO_PIN, INPUT);
//   pinMode(BUZZER_PIN, OUTPUT);

//   /*
//       Starting OLED Display Module
//   */
//   if(!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
//     Serial.println("Display memory allocation error !!!");
//     for(;;);
//     // while(1);
//   }
  
//   showSplashScreen();
// }

// void showSplashScreen() {
//   /*
//       Display SplashScreen Animation (once)
//   */
//   oled.clearDisplay();

//   oled.setTextSize(2);
//   oled.setTextColor(WHITE);
//   oled.setCursor(25, 20);
//   oled.println("Welcome");
//   oled.display();

//   oled.println();
//   oled.setTextSize(1);
//   for(int i=0; i<=20; i++) {
//     oled.print("=");
//     oled.display();
//     delay(250);
//   }
// }

// void loop() {
//   // put your main code here, to run repeatedly:
//   getWaterLevel();
//   displayWaterLevel();
// }

// void getWaterLevel() {
//   /*
//     Getting data from ultrasonic sensor,
//     and calculate water level
//   */
//   // digitalWrite(TRIG_PIN, LOW);
//   // delayMicroseconds(2);
//   digitalWrite(TRIG_PIN, HIGH);
//   delayMicroseconds(10);
//   digitalWrite(TRIG_PIN, LOW);

//   duration_pulseMicros = pulseIn(ECHO_PIN, HIGH);
//   distance_cm = duration_pulseMicros / pulse_to_cm;
//   Serial.println(distance_cm);

//   if((distance_cm <= tank_empty) && (distance_cm >= tank_full)) {
//     water_level = (tank_empty - distance_cm) / tank_volume * 100;
//   } else {
//     water_level = 101;
//   }

//   delay(200);
// }

// void displayWaterLevel() {
//   oled.clearDisplay();
//   oled.setTextSize(2);
//   oled.setTextColor(WHITE);
//   oled.setCursor(0, 0);

//   if(water_level <= 100) {
//     /*
//         Display Water Level
//     */
//     oled.println("Water :");
//     oled.println();

//     oled.setTextSize(4);
//     String tank_detail = String(water_level);
//     tank_detail += " %";
//     oled.println(tank_detail);
//     oled.display();
  
//   } else {
//     /*
//         Over-Flow Alert
//     */
//     oled.setCursor(10, 25);
//     oled.println("Over-Flow");
//     oled.display();
//     digitalWrite(BUZZER_PIN, HIGH);
//     delay(500);
    
//     oled.clearDisplay();
//     oled.display();
//     digitalWrite(BUZZER_PIN, LOW);
//     delay(100);
//   }
// }






// #include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define TRIG_PIN 2
#define ECHO_PIN 3
#define BUZZER_PIN 13
// #define LED_PIN 13
// #define POT_PIN 12

// Wifi Connection
#include <ESP8266WiFi.h>
#define MAIN_SSID "Airtel_Spam"
#define MAIN_PWD "Arsh007$"
#define ESP_SSID "aadi_esp8266"
#define ESP_PWD "Aadi8667"

Adafruit_SSD1306 oled (128, 64);
// Adafruit_SSD1306 oled (128, 64, &Wire, -1);

const float tank_empty = 42;
const float tank_full = 12;
const float tank_volume = tank_empty - tank_full;

long duration_pulseMicros = 0;
int pulse_to_cm = 58;
int pulse_to_inches = 148;
int distance_cm = 0;
int water_level = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  // pinMode(POT_PIN, INPUT);

  /*
      Starting OLED Display Module
  */
  if(!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("Display memory allocation error !!!");
    for(;;);
    // while(1);
  }
  
  showSplashScreen();
  // playTone();
  connectWifi();
}

void showSplashScreen() {
  /*
      Display SplashScreen Animation (once)
  */
  oled.clearDisplay();

  oled.setTextSize(2);
  oled.setTextColor(WHITE);
  oled.setCursor(25, 20);
  oled.println("Welcome");
  oled.display();

  oled.println();
  oled.setTextSize(1);
  for(int i=0; i<=20; i++) {
    oled.print("=");
    oled.display();
    delay(100);
  }
}

void playTone() {
  
}

void connectWifi() {
  WiFi.begin(MAIN_SSID, MAIN_PWD);
  
  while(WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.println("IP Address : ");
  Serial.println(WiFi.localIP());

  Serial.println("Starting ESP WiFi....");
  WiFi.softAP(ESP_SSID, ESP_PWD);
  Serial.println("IP Address : ");
  Serial.println(WiFi.softAPIP());
}




/**
    LOOP() Method
*/

void loop() {
  // put your main code here, to run repeatedly:
  getWaterLevel();
  displayWaterLevel();
  // getPotData();
}

void getWaterLevel() {
  /*
    Getting data from ultrasonic sensor,
    and calculate water level
  */
  // digitalWrite(TRIG_PIN, LOW);
  // delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration_pulseMicros = pulseIn(ECHO_PIN, HIGH);
  distance_cm = duration_pulseMicros / pulse_to_cm;
  Serial.println(distance_cm);

  if((distance_cm <= tank_empty) && (distance_cm >= tank_full)) {
    water_level = (tank_empty - distance_cm) / tank_volume * 100;
  } else {
    water_level = 101;
  }

  delay(200);
}

void displayWaterLevel() {
  oled.clearDisplay();
  oled.setTextSize(2);
  oled.setTextColor(WHITE);
  oled.setCursor(0, 0);

  if(water_level <= 100) {
    /*
        Display Water Level
    */
    oled.println("Water :");
    oled.println();

    oled.setTextSize(4);
    String tank_detail = String(water_level);
    tank_detail += " %";
    oled.println(tank_detail);
    oled.display();
    
  } else {
    /*
        Over-Flow Alert
    */
    oled.setCursor(10, 25);
    oled.println("Over-Flow");
    oled.display();
    // digitalWrite(BUZZER_PIN, HIGH);
    tone(BUZZER_PIN, 3000);
    delay(500);
    
    oled.clearDisplay();
    oled.display();
    // digitalWrite(BUZZER_PIN, LOW);
    noTone(BUZZER_PIN);
    delay(100);
  }
}

// void getPotData() {
//   Serial.println(analogRead(POT_PIN));
// }