#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include "EEPROM.h"
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
long duration, inches;
int lvl,m,sm,fulllvl,lowlvl,lowset,mode,dly,inch;
bool st,out;
void setup()
{
    pinMode(2, INPUT);
    pinMode(4, OUTPUT);  
    pinMode(15, OUTPUT);    
    pinMode(34, INPUT);
    pinMode(35, INPUT);
   Serial.begin(9600);
  EEPROM.begin(4);
   //-----------
  // initialize the LCD
  lcd.begin(16,2);

  // Turn on the blacklight and print a message.
  lcd.backlight();
  lcd.print("TANK LEVEL: 100%");
  lcd.setCursor(0, 1);
  lcd.print("MODE:A   OUT:OFF");
    mode=EEPROM.read(0);  
    lowset=EEPROM.read(1);
    fulllvl=EEPROM.read(2);
    lowlvl=EEPROM.read(3);
    if(mode>1)mode=0; 
    if(lowset<10)lowset=10;
    if(lowset>90)lowset=10; 
    if(fulllvl>100)lowlvl=0;
    if(lowlvl>120)lowlvl=1; 

 
}

void loop()
{
  dly++;
  digitalWrite(4, LOW);
   delayMicroseconds(2);
   digitalWrite(4, HIGH);
   delayMicroseconds(10);
   digitalWrite(4, LOW);
   duration = pulseIn(2, HIGH);
   inches = microsecondsToInches(duration);
 inch=inches-fulllvl;
   lvl=(((lowlvl-inch))*100)/(lowlvl);
   if(lvl<0)lvl=0;
if(lvl>100)lvl=100;   
//----------------------------------
if( digitalRead(35)&digitalRead(34))st=0;
   if( !digitalRead(34)&!st){
     st=1;
    if(m==0){m=1;
lcd.clear();    
    lcd.setCursor(0, 0);
lcd.print("      MODE      ");}  
else if(m==2|m==1){
  lcd.setCursor(0, 1);
  lcd.print("               "); 
  if(sm==0){sm=1;

  }
else  if(sm==1){sm=0;
  if(m==1) EEPROM.write(0, mode);
 else EEPROM.write(1, lowset);
EEPROM.commit();   


  
  }

  
}
     else if(m==3){
fulllvl=inches;
 lcd.setCursor(7, 1);
  lcd.print(fulllvl);  
EEPROM.write(2, fulllvl);
EEPROM.commit();  
delay(1000); 
lcd.setCursor(0, 1);
  lcd.print("               ");  
    } 
       
    else if(m==4){
lowlvl=inch;
if(lowlvl<1)lowlvl=1;
 lcd.setCursor(7, 1);
  lcd.print(lowlvl);  
EEPROM.write(3, lowlvl);
EEPROM.commit();  
delay(1000); 
lcd.setCursor(0, 1);
  lcd.print("               ");  
    }
    else if(m==5){
      m=0;
    
lcd.setCursor(0, 0);      
  lcd.print("TANK LEVEL: 100%");
  lcd.setCursor(0, 1);
  lcd.print("MODE:A   OUT:OFF");      
      }

   }
 if( !digitalRead(35)&!st){
   st=1;
if(m==0){
 if(mode==1&lvl<99){out=!out; delay(500);  }
}
 else{ 
if(sm==0){m++;
if(m>5)m=1;
lcd.setCursor(0, 0);
if(m==1)lcd.print("      MODE      ");
if(m==2)lcd.print("   LOW LEVEL    ");
if(m==3)lcd.print(" CALIBRATE  FULL");
if(m==4)lcd.print(" CALIBRATE EMPTY");
if(m==5)lcd.print("      EXIT      ");
}else{
if(m==1)mode++;
if(m==2)lowset+=10;
if(mode>1)mode=0;
  if(lowset>90)lowset=10;
}
 }  } 
  //---------------------


  //-------------
if(dly>30){dly=0;
     Serial.print("level ");
     Serial.print(lvl);
     Serial.print("  inch ");
     Serial.println(inches);
    if(lvl>99)out=0;
else if(mode==0&lvl<lowset)out=1;

if(m==0) {  
//------------------------------
lcd.setCursor(12, 0);
if(lvl<100)lcd.print(" ");
if(lvl<10)lcd.print(" ");
lcd.print(lvl);
 lcd.setCursor(5, 1);
if(mode==0)lcd.print("ATO"); 
else if(mode==1)lcd.print("MAN"); 

 lcd.setCursor(13, 1);
if(out)lcd.print("ON "); 
else lcd.print("OFF"); 
}  
else if(sm==1){
 if(m==1) {
   lcd.setCursor(6, 1);
  if(mode==0)lcd.print("ATO"); 
else if(mode==1)lcd.print("MAN");   


  
  }else  if(m==2){
   lcd.setCursor(7, 1);
  lcd.print(lowset);  


  
  }

}
}
//----------------------------
digitalWrite(15,out);
//----------------
     delay(10);
}
long microsecondsToInches(long microseconds) {
   return microseconds / 74 / 2;
}