/*
* Mengukur Jarak Dengan Sensor Ultrasonik HC-SR04
*
* by Nasrullah,
* www.Letskeeplearning.NET
*
*/
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
// defines pins numbers
int trigPin = 9;
int echoPin = 10;

// defines variables
long duration;
int distance;
int hijau = 3;
int orange = 4;
int merah = 5;
int alarm = 6;

void setup() {
lcd.init();
lcd.backlight();
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
pinMode(hijau, OUTPUT);
pinMode(orange, OUTPUT);
pinMode(merah, OUTPUT);
pinMode(alarm, OUTPUT);
Serial.begin(9600); // Starts the serial communication
lcd.setCursor(0,0);
lcd.print("MINI PROJEK");
lcd.setCursor(0,1);
lcd.print("PRAK. INSTRUMEN");
lcd.setCursor(0,2);
lcd.print("KELOMPOK 2");
lcd.setCursor(0,3);
lcd.print("SENSOR HC-SR04");
delay(1000);
lcd.clear();

lcd.setCursor(0,0);
lcd.print("ANGGOTA KELOMPOK");
lcd.setCursor(0,1);
lcd.print("1. AQID MUKHTAR");
lcd.setCursor(0,2);
lcd.print("2. BLA");
lcd.setCursor(0,3);
lcd.print("3. BLA");
delay(1000);
lcd.clear();

}

void loop() {
float tw = 20.1;
float vw = 200.1;
float va, ta;
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

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

// Calculating the distance
distance= (duration/2)/29.1;
ta = tw-distance;
va = vw*ta;

lcd.setCursor(0, 0);
lcd.print("SensorPendeteksiAir");
lcd.setCursor(0, 1);
lcd.print("Tinggi Air= ");
lcd.setCursor(12, 1);
lcd.print(ta);
lcd.print(" Cm");
lcd.setCursor(0, 2);
lcd.print("Volume Air= ");
lcd.setCursor(12, 2);
lcd.print(va);
lcd.print(" CM3");


// Prints the distance on the Serial Monitor
Serial.print("Jarak: ");
Serial.print(distance);
Serial.println(" cm");

if((distance>=0)&&(distance<=5)){
lcd.setCursor(0,3);
lcd.print("MATIKAN POMPA");}

else if((distance>=5)&&(distance<=399)){
lcd.setCursor(0,3);
lcd.print("HIDUPKAN POMPA");}

if (distance>=15){
  digitalWrite(hijau, HIGH);
  digitalWrite(orange, LOW);
  digitalWrite(merah,LOW);
  digitalWrite(alarm, LOW);
}
else if ((distance<=15)&&(distance>10)){
  digitalWrite(hijau, LOW);
  digitalWrite(orange, HIGH);
  digitalWrite(merah,LOW);
  digitalWrite(alarm, LOW);
}
else if ((distance<=10)&&(distance>5)){
  digitalWrite(hijau, LOW);
  digitalWrite(orange, LOW);
  digitalWrite(merah,HIGH);
  digitalWrite(alarm, HIGH);
}

}