#include <LiquidCrystal_I2C.h>
#define ECHO_PIN 6
#define TRIG_PIN 5
#define merah 10
#define kuning 9
#define hijau 8
#define buzzer 4

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(hijau, OUTPUT);
  pinMode(buzzer, OUTPUT);

  lcd.init();
  lcd.backlight();
}

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

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  float volume = 20 * (distance/200);

  Serial.print("Jarak: ");
  Serial.println(distance);
  Serial.print("Volume: ");
  Serial.println(volume);


  lcd.setCursor(1, 0);
  lcd.print("Jarak:");
  lcd.print(distance);
  lcd.print("");
  lcd.print("cm");

  lcd.setCursor(1, 1);
  lcd.print("Volume:");
  lcd.print(volume);
  lcd.print("");
  lcd.print("cm3");
  
  
  
  delay(100);

  if (volume > 20){
    digitalWrite(merah, HIGH);
    digitalWrite(kuning, LOW);
    digitalWrite(hijau, LOW);
    tone(buzzer, 500, 10);
  }
  if (volume > 15 && volume <= 20){
    digitalWrite(merah, LOW);
    digitalWrite(kuning, HIGH);
    digitalWrite(hijau,LOW);
    }
  if (volume > 0 && volume <= 15){
    digitalWrite(merah, LOW);
    digitalWrite(kuning, LOW);
    digitalWrite(hijau, HIGH);
  }
  
  delay(100);
}