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

const int trigPin = 9;
const int echoPin = 8;

long duration;
int distance;
int maxDistance = 100; // Maximum distance for the trash bin height in cm

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Garbage Level:");
}

void loop() {
  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distance = duration * 0.034 / 2;

  // Calculate the fill level percentage
  int fillLevel = map(distance, 0, maxDistance, 100, 0);

  // Display the fill level on the LCD
  lcd.setCursor(0, 1);
  lcd.print("Level: ");
  lcd.print(fillLevel);
  lcd.print("%   ");
  
  delay(500);
}