//Program Water Level 
//By Intan Nur'aini Azizah XI TEDK1

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

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

void setup() {
  lcd.init();
  lcd.backlight ();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("   WECOME TO" );
  lcd.setCursor(0,1);
  lcd.print(" WATER LEVEL ");
  delay(2000);
  lcd.clear();
 pinMode(trig,OUTPUT); 
 pinMode(echo,INPUT);
 pinMode(led, OUTPUT);
 pinMode(buzzer, OUTPUT);
 Serial.begin(9600);
}

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(0,0);
 lcd.print ("jarak=    ");
 lcd.setCursor(8,0);
 lcd.print(jarak);
 lcd.print(" cm   ");
 delay (200);

 if(jarak > 100) {
 tone(buzzer,200,1000);
 digitalWrite(led, HIGH);
}
 else {
 noTone(100);
 }

if(jarak<20){
  digitalWrite(led, LOW);
}
delay(500);
}