//Program Water Level
//By Dheni Anggara XI TEDK 1

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

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

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

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

 waktu = pulseIn(echo,HIGH);
 jarak = waktu/58.5;

 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,500,1000);
 }
 else {
 noTone(100);
 }

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

}
/***************TUGAS**********************
1. Jika jarak > 100 cm, maka buzzer berbunyi
2. Jika jarak < 100 cm, maka buzzer tidak berbunyi
3. Jika jarak > 20 cm, maka LED menyala
4. Jika jarak < 20 cm, maka LED padam

Dikumpulkan linknya di: https://tugas3-pkk-xitedk
************************************************/