// Blynk credentials
#define BLYNK_TEMPLATE_ID "TMPL3sYaEsPFu"
#define BLYNK_TEMPLATE_NAME "Smart Waste Monitoring System"
#define BLYNK_AUTH_TOKEN "6sG3Jw_gqbQ-17NC3_IU9J6vgG7_4xqD"

#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_LINES 2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define PIN_TRIG 26
#define PIN_ECHO 25
#define GreenLight 18
#define RedLight 5


// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";


void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(GreenLight, OUTPUT);
  pinMode(RedLight, OUTPUT);

  // Initialize I2C and LCD
  Wire.begin();
  lcd.init();
  lcd.backlight();

  // Connect to WiFi and Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

float readDistanceCM() {
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  int duration = pulseIn(PIN_ECHO, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  Blynk.run(); // Run Blynk

  float distance = readDistanceCM();

  // Check the distance and update the lights
  bool notNearby = distance < 350;
  bool almostFull = distance > 385;

  digitalWrite(GreenLight, notNearby);
  digitalWrite(RedLight, almostFull);

  // Serial output for debugging
  Serial.print("Distance in CM: ");
  Serial.println(distance);

  // Update the LCD display
  lcd.clear();  // Clear the LCD before printing
  lcd.setCursor(0, 0);
  if (notNearby && !almostFull) {
    lcd.print("BIN HAS SPACE");
    
    Blynk.virtualWrite(V0, "Bin still has space");
    Blynk.virtualWrite(V0, HIGH);
    Blynk.virtualWrite(V1, LOW);
     // Update Blynk app
  } else if (almostFull) {
    lcd.print("BIN IS FULL");
    Blynk.virtualWrite(V1, "Bin is near full");
    Blynk.virtualWrite(V0, LOW);
    Blynk.virtualWrite(V1, HIGH);// Update Blynk app
  } else {
    lcd.print("CHECK SENSOR");  // For unexpected readings
    Blynk.virtualWrite(V1, "Check sensor"); // Update Blynk app
  }

  Blynk.virtualWrite(V2, distance); // Send distance to Blynk

  delay(1000);  // Slightly longer delay for readability
}