//Sitthiphon Phasouk
#define BLYNK_TEMPLATE_ID "TMPL2PinXViV3"
#define BLYNK_TEMPLATE_NAME "irrigation system"
#define BLYNK_AUTH_TOKEN "WtfLVeNP9AZYBiqorsZNC4SEANeabc5Y"

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

int emptyTankDistance = 95 ;  //Distance when tank is empty
int fullTankDistance =  10 ;  //Distance when tank is full

int triggerPer =   10 ;  //alarm will start when water level drop below triggerPer

#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <AceButton.h>
using namespace ace_button; 

// Define connections to sensor
#define TRIGPIN 14  
#define ECHOPIN 27  
#define wifiLed 2    
#define RedLed 26  

//Change the virtual pins according the rooms
#define VPIN_BUTTON_1 V1 
#define VPIN_BUTTON_2 V2

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 32 

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

float duration;
float Level;
int   waterLevelPer;
bool  toggleBuzzer = HIGH; //Define to remember the toggle state

char auth[] = BLYNK_AUTH_TOKEN;
ButtonConfig config1;
AceButton button1(&config1);

void handleEvent1(AceButton*, uint8_t, uint8_t);
BlynkTimer timer;

void checkBlynkStatus() 
{
  bool isconnected = Blynk.connected();
  if (isconnected == false) 
  {
    digitalWrite(wifiLed, LOW);
  }
  if (isconnected == true) 
  {
    digitalWrite(wifiLed, HIGH);
  }
}

BLYNK_CONNECTED() {
  Blynk.syncVirtual(VPIN_BUTTON_1);
  Blynk.syncVirtual(VPIN_BUTTON_2);
}

void displayData(int value){
  display.clearDisplay();
  display.setTextSize(4);
  display.setCursor(8,2);
  display.print(value);
  display.print(" ");
  display.print("%");
  display.display();
}

void measureDistance(){
  digitalWrite(TRIGPIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGPIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGPIN, LOW);
  duration = pulseIn(ECHOPIN, HIGH);
  Level = ((duration / 2) * 0.343)/10;

  if (Level > (fullTankDistance)  && Level < emptyTankDistance ){
    waterLevelPer = map((int)Level ,emptyTankDistance, fullTankDistance, 0, 100);
    displayData(waterLevelPer);
    Blynk.virtualWrite(VPIN_BUTTON_1, waterLevelPer);
    Blynk.virtualWrite(VPIN_BUTTON_2, (String(Level) + " cm"));

    // Print result to serial monitor
    Serial.print("Distance: ");
    Serial.print(Level);
    Serial.println(" cm");
    if (Level <= 10){
      Serial.println("Full Tank");
    }
    if (Level >= 90){
      Serial.println("Empty Tank");
    }

    if (waterLevelPer < triggerPer){
      digitalWrite(RedLed, HIGH);
    }
    else
      digitalWrite(RedLed, LOW);
         
  }
  delay(100);
}
 
void setup() {
  // Set up monitor
  Serial.begin(115200);
 
  // Set up sensor connections
  pinMode(ECHOPIN, INPUT);
  pinMode(TRIGPIN, OUTPUT);
  pinMode(wifiLed, OUTPUT);
  pinMode(RedLed, OUTPUT);

  digitalWrite(wifiLed, LOW);
  digitalWrite(RedLed, LOW);
  
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) 
  {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(800);  
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.clearDisplay();

  WiFi.begin(ssid, pass);
  timer.setInterval(2000L, checkBlynkStatus); // check if Blynk server is connected every 2 seconds
  Blynk.config(auth);
  delay(800);
}
 void loop() {
  measureDistance();
  Blynk.run();
  timer.run();
  button1.check();   
}