#include <EEPROM.h>

#include <LiquidCrystal.h>
LiquidCrystal lcd(2,3,4,5,6,7);

long duration, inches;
int set_val,percentage;
bool alarm_state,pump1,pump2,valve;


void setup() {

  lcd.begin(20, 4);
  lcd.print("LEVEL  :");
  lcd.setCursor(0, 1); 
  lcd.print("MODE   :LEAD A   ");
  lcd.setCursor(0, 2); 
  lcd.print("VALVE  : OPEN   ");
  lcd.setCursor(0, 3); 
  lcd.print("STATUS :NORMAL   ");

  pinMode(0, OUTPUT);
  pinMode(1, INPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  
   set_val=EEPROM.read(0);
   if(set_val>150)set_val=150;
}
void loop() {
  
   digitalWrite(3, LOW);
   delayMicroseconds(2);
   digitalWrite(0, HIGH);
   delayMicroseconds(10);
   digitalWrite(0, LOW);
   duration = pulseIn(1, HIGH);
   inches = microsecondsToInches(duration);
   
   percentage=(set_val-inches)*100/set_val;
   
   lcd.setCursor(8, 0); 
   if(percentage<0)percentage=0;
   lcd.print(percentage);
   lcd.print("%   ");
   
   if (percentage>=90){
      alarm_state=1;
      digitalWrite(8, HIGH);
   }
   if (percentage<=40&!digitalRead(10)){
      alarm_state=0;
      digitalWrite(8, LOW);
   }

   // LEAD A
   if(percentage>=60&!alarm_state&!digitalRead(11))pump1=1;
   if(percentage>=70&!alarm_state&!digitalRead(11))pump2=1;
   if(percentage<=40&!alarm_state&!digitalRead(11)){
      pump1=0;
      pump2=0;
      valve=1;
   }
   if(percentage>=90&!digitalRead(11)){
      pump1=0;
      pump2=0;
      valve=0;
   }
   digitalWrite(12, !pump1);
   digitalWrite(9, !pump2);
   digitalWrite(13, !valve);
   
   // LEAD B
   if(percentage>=60&!alarm_state&digitalRead(11))pump2=1;
   if(percentage>=70&!alarm_state&digitalRead(11))pump1=1;
   if(percentage<=40&!alarm_state&digitalRead(11)){
      pump1=0;
      pump2=0;
      valve=1;   
   }
   if(percentage>=90&digitalRead(11)){
      pump2=0;
      pump1=0;
      valve=0;
   }
   digitalWrite(12, !pump1);
   digitalWrite(9, !pump2);
   digitalWrite(13, !valve);

   lcd.setCursor(8, 3);
   if(percentage>=70)lcd.print("LEVEL HIGH");
   else lcd.print("NORMAL    ");
   lcd.setCursor(8, 3);
   if(percentage>=90) lcd.print("ALARM     ");
   
     
   lcd.setCursor(8, 2);
   if(valve)lcd.print("OPEN ");
   else lcd.print("CLOSE");
   
    lcd.setCursor(8, 1);
    if(!digitalRead(11))lcd.print("LEAD A");
    else lcd.print("LEAD B   ");
    
    delay(500);
}
long microsecondsToInches(long microseconds) {
   return microseconds / 74 / 2;
}