#include <LiquidCrystal_I2C.h>
#define relay_1 2
#define relay_2 3
#define up 8
#define down 9
#define set 10
#define sett 11
#define trigPin A1
#define echoPin A0


LiquidCrystal_I2C lcd(0x27, 16, 2);
int tinggi_tandon=0;
int tinggi=50;
int rendah=20;
int error=0;
int delay_relay=2000;

long duration;
int distance,jarak,jarak1;
int menu=0;
int flag=0;
void sensor ()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  jarak=tinggi_tandon-distance;
  jarak1 = map(jarak, 0, error, 0, 100);
  Serial.print("Water Level = ");
  Serial.println (distance);
  delay(500);
  //lcd.setCursor(0,1); lcd.print(String () + "Level Air :" + jarak1 +" %" +" ");
  lcd.setCursor(0,1); lcd.print(String () + "Level Air :" + distance +" cm" +" ");
 
}

void setup() {
  Serial.begin(9600);
  digitalWrite (relay_1, LOW);
  digitalWrite (relay_2, LOW);
  pinMode (relay_1, OUTPUT);
  pinMode (relay_2, OUTPUT);
  pinMode (set, INPUT_PULLUP);
  pinMode (sett, INPUT_PULLUP);
  pinMode (up, INPUT_PULLUP);
  pinMode (down, INPUT_PULLUP);
  lcd.init();
 lcd.backlight();

}

void loop() {
   if (digitalRead(sett)==LOW){delay(200); lcd.clear(); menu+=1; if(menu==5) menu=0;}
   if (digitalRead(set)==LOW){delay(200); lcd.clear(); menu-=1; if(menu==0) menu=0;
   if (menu==-1) menu=4;}
   if (distance>=tinggi && flag==0)
      { 
        digitalWrite (relay_1, HIGH); delay(delay_relay);
        flag=1;
      }
   if (distance>=tinggi && flag==1){digitalWrite (relay_1, LOW);digitalWrite (relay_2, HIGH); }
   if (distance<=rendah)
      { flag=0;
        digitalWrite (relay_1, LOW);
        digitalWrite (relay_2, LOW);
      }
    
    switch(menu)
    {
      case 0:
      lcd.setCursor(0,0);lcd.print(String() + ">>"+" Setting");
      sensor ();
      break;

      case 1:
      lcd.setCursor(1,0);lcd.print(String() +"Tinggi Tandon ");
      lcd.setCursor(0,1);lcd.print(String() +">"+ "Set : "+tinggi_tandon + " cm" + " ");
      if (digitalRead(up)==LOW){ delay(200); tinggi_tandon++;}
      if (digitalRead(down)==LOW){ delay(200);tinggi_tandon--;}
      break;

      case 2:
      lcd.setCursor(1,0);lcd.print(String() +"Error");
      lcd.setCursor(0,1);lcd.print(String() +">"+"Set :" +error +" cm" +" ");
      if (digitalRead(up)==LOW){ delay(200); error++;}
      if (digitalRead(down)==LOW){ delay(200);error--;}
      break;

      case 3:
      lcd.setCursor(0,0);lcd.print(String() +">Tinggi :" +tinggi +" %" + "   ");
      lcd.setCursor(1,1);lcd.print(String() +"Rendah :" + rendah + " %" + " ");
      if (digitalRead(up)==LOW){ delay(200); tinggi++; if (tinggi==101) tinggi=50;}
      if (digitalRead(down)==LOW){ delay(200);tinggi--; if (tinggi==50) tinggi=100;}
      break;

      case 4:
      lcd.setCursor(1,0);lcd.print(String() +"Tinggi :" + tinggi +" %" + "  " );
      lcd.setCursor(0,1);lcd.print(String() +">Rendah :" + rendah + " %" + "  ");
      if (digitalRead(up)==LOW){ delay(200); rendah++; if (rendah==49) rendah=0;}
      if (digitalRead(down)==LOW){ delay(200);rendah--; if (rendah==0) rendah=49;}
      break;
    }
}