//Program Water Level
//By Syafiq Fawwaz Azzam XI TEDK 1

int trig = 6;
int echo = 5;
int buzzer = 2;
int led =  A0;
long waktu, jarak;

#include <LiquidCrystal_I2C.h>;
LiquidCrystal_I2C lcd (0x27,16,2);

void setup() {
  pinMode(echo,INPUT);
  pinMode(trig,OUTPUT);
  pinMode(buzzer,OUTPUT);
  pinMode(led,OUTPUT);
  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(5,0);
  lcd.print("Projek");
  lcd.setCursor(2,1);
  lcd.print("Water  Level ");
  delay(2000);
  lcd.clear();
  lcd.setCursor(7,0);
  lcd.print("By");
  lcd.setCursor(5,1);
  lcd.print("Syafiq ");
  delay(3000);
  lcd.clear();
  
}

void loop() {
  digitalWrite(trig,HIGH);
  delayMicroseconds(5);
  digitalWrite(trig,LOW);
  delayMicroseconds(5);

  waktu = pulseIn(echo,HIGH);
  jarak = waktu/58.4;

  Serial.print("Jarak = ");
  Serial.print( jarak);
  Serial.println(" cm");

  lcd.setCursor(3,0);
  lcd.print("Jarak= ");
  lcd.setCursor(10,0);
  lcd.print(jarak);
  lcd.print("cm");
  delay(200);

  if(jarak>100){
    tone(buzzer, 200);
    digitalWrite(led,LOW);
  }
  else if(jarak>20){
    noTone(buzzer);
    digitalWrite(led,HIGH);
  }
  else {
    digitalWrite(led,LOW);
  }
}