// IOT2 - 29 FARID SYAIFUL HIDAYAT

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

String note;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  //ULTRASONIC
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, INPUT);
  //LED
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
}

long bacaJarakCM(){ //bisa di ganti dengan float / int
  digitalWrite(3,0);
  delayMicroseconds(2);
  digitalWrite(3,1);
  delayMicroseconds(10);
  digitalWrite(3,0);
  int durasi = pulseIn(2,1);
  //return durasi * 0.034 / 2;
  return (durasi / 2) / 29.1; 
}

void deteksi() {
  int jarak = bacaJarakCM();
  Serial.print("Jarak Air: ");
  Serial.print(bacaJarakCM());
  Serial.print("cm | ");
  Serial.println(note);

  if (jarak <= 50){
  digitalWrite(6, HIGH);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
  note ="Status: Banjir";
  //
  lcd.setCursor(0, 0);
  lcd.print("Jarak Air: ");
  lcd.print(bacaJarakCM());
  lcd.print("cm    ");
  lcd.setCursor(0, 1);
  lcd.print(note);
  lcd.print("             ");
  }
  else if(jarak >= 50 && jarak <=100) {
  digitalWrite(6, LOW);
  digitalWrite(7, HIGH);
  digitalWrite(8, LOW);
  note = "Status: Siaga";
  //
  lcd.setCursor(0, 0);
  lcd.print("Jarak Air: ");
  lcd.print(bacaJarakCM());
  lcd.print("cm    ");
  lcd.setCursor(0, 1);
  lcd.print(note);
  lcd.print("             "); 
  }
  else if(jarak >= 100){
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  digitalWrite(8, HIGH);
  note = "Status: Aman";
  //
  lcd.setCursor(0, 0);
  lcd.print("Jarak Air: ");
  lcd.print(bacaJarakCM());
  lcd.print("cm    ");
  lcd.setCursor(0, 1);
  lcd.print(note);
  lcd.print("             ");
  } 
  else {
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
  note = "";
  }
  delay(50);
}

void loop(){
  deteksi();
}