//water level controller v1.1
#include <EEPROM.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
long duration, inches;
int set_val,percentage;
bool state,pump;
int pump2State=LOW;
int lastButtonState;
int currentButtonState;
int tankFull=0;
int alreadyBlinked = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("WATER LEVEL");
  lcd.setCursor(4, 1);
  lcd.print("CONTROLLER");
  delay(1000);
  lcd.clear();
  lcd.print("WATER LEVEL:");
  lcd.setCursor(0, 1);
  lcd.print("PUMP :    MANUAL");
  
  pinMode(8, OUTPUT);//trigger
  pinMode(9, INPUT);//echo
  pinMode(10, INPUT_PULLUP);//push switch
  pinMode(11, INPUT_PULLUP);//manual switch
  pinMode(12, OUTPUT);//relay
  pinMode(7, OUTPUT);//tank full
  pinMode(6, INPUT_PULLUP);
  pinMode(5, OUTPUT);//pump2
  pinMode(4, INPUT_PULLUP);//lowe tank low level
  pinMode(3, INPUT_PULLUP);//lower tank highlevel);
  pinMode(2, OUTPUT); //relay for staterter
  pinMode(13,OUTPUT);

  currentButtonState= digitalRead(6);
  Serial.begin(9600);
   set_val=EEPROM.read(0);
   if(set_val>150)set_val=150;
}
void loop() {
   digitalWrite(8, HIGH);
   delayMicroseconds(10);
   digitalWrite(8, LOW);
    noTone(13);	
   duration = pulseIn(9, HIGH);
   inches = microsecondsToInches(duration); 
   percentage=(set_val-inches)*100/set_val;
   
   lcd.setCursor(12, 0); 
   if(percentage<0)percentage=0;
   lcd.print(percentage);
   lcd.print("%   ");
    
   if(percentage<30&digitalRead(11))pump=1;
   if(percentage>95)pump=0,pump2State=0;
   digitalWrite(12,pump);
   digitalWrite(5,pump2State); // for inverted  relay output replace pump into !pump 
   lcd.setCursor(6, 1);
   if(pump==1)lcd.print("ON ");
   else if(pump==0 & pump2State==LOW) lcd.print("OFF");
            
   
    lcd.setCursor(10, 1);
    if(!digitalRead(11))lcd.print("MANUAL");
    else lcd.print("AUTO   ");
    if(percentage>80) {digitalWrite(7, HIGH);
    tankFull=1;}
    else {digitalWrite(7, LOW);
    tankFull=0;}
   
   lastButtonState    = currentButtonState;      // save the last state
  currentButtonState = digitalRead(6); // read new state
 
 if(lastButtonState == HIGH && currentButtonState == LOW && !digitalRead(11)){

    // toggle state of pump
    pump2State = !pump2State;

    // control pump2 arccoding to the toggled state
    digitalWrite(5, pump2State); 
  
  }

if(pump&alreadyBlinked == 0)
      {
             digitalWrite(2, HIGH);   // set the satrter relay on
              // play a note on pin 6 for 200 ms:
  tone(13, 440, 200);
  
             delay(1000);                  // wait for a second
             digitalWrite(2, LOW);    // set the relay off
             // turn off tone function for pin 6:
  noTone(13);
             alreadyBlinked = 1;
       }
   
   if(!pump&alreadyBlinked == 1) alreadyBlinked = 0;
       
if(pump2State==HIGH)
   {lcd.setCursor(0, 1);
  lcd.print("PUMP2:ON ");
  }
else
{lcd.setCursor(0, 1);
  lcd.print("PUMP ");}

  
if(!digitalRead(10)&!state&digitalRead(11)&!digitalRead(6)){
      state=1;
      set_val=inches;
      EEPROM.write(0, set_val);
      }
      
     if(!digitalRead(10)&!state&!digitalRead(11)){
        state=1;
        pump=!pump;
      }
 if(!digitalRead(4)&!tankFull&!digitalRead(3)& !pump2State&digitalRead(11)){
    pump2State=!pump2State;
    
    digitalWrite(5,pump2State);
   
    }
if(digitalRead(4)&digitalRead(3)&pump2State&digitalRead(11)) pump2State=0;
digitalWrite(5,pump2State);

    if(digitalRead(10))state=0;
    delay(500);

}
long microsecondsToInches(long microseconds) {
   return microseconds / 74 / 2;
}