Automatic Water Pump Controller Using Arduino Uno

1#include <EEPROM.h>
2
3#include <LiquidCrystal.h>
4LiquidCrystal  lcd(2,3,4,5,6,7);
5
6long duration, inches;
7int set_val,percentage;
8bool  state,pump;
9
10
11void setup() {
12  
13  lcd.begin(16, 2);
14  lcd.print("WATER  LEVEL:");
15  lcd.setCursor(0, 1); 
16  lcd.print("PUMP:OFF MANUAL");
17  
18  pinMode(8, OUTPUT);
19  pinMode(9, INPUT);
20  pinMode(10, INPUT_PULLUP);
21  pinMode(11, INPUT_PULLUP);
22  pinMode(12, OUTPUT);
23  
24   set_val=EEPROM.read(0);
25   if(set_val>150)set_val=150;
26}
27void loop() {
28  
29   digitalWrite(3,  LOW);
30   delayMicroseconds(2);
31   digitalWrite(8, HIGH);
32   delayMicroseconds(10);
33   digitalWrite(8, LOW);
34   duration = pulseIn(9, HIGH);
35   inches = microsecondsToInches(duration);
36   
37   percentage=(set_val-inches)*100/set_val;
38   
39   lcd.setCursor(12,  0); 
40   if(percentage<0)percentage=0;
41   lcd.print(percentage);
42   lcd.print("%   ");
43    
44   if(percentage<30&digitalRead(11))pump=1;
45   if(percentage>99)pump=0;
46   digitalWrite(12,!pump);
47     
48   lcd.setCursor(5, 1);
49   if(pump==1)lcd.print("ON  ");
50   else if(pump==0) lcd.print("OFF");
51   
52    lcd.setCursor(9, 1);
53    if(!digitalRead(11))lcd.print("MANUAL");
54    else lcd.print("AUTO   ");
55    
56    if(!digitalRead(10)&!state&digitalRead(11)){
57      state=1;
58      set_val=inches;
59      EEPROM.write(0, set_val);
60      }
61      
62     if(!digitalRead(10)&!state&!digitalRead(11)){
63        state=1;
64        pump=!pump;
65     
66      }
67      
68    if(digitalRead(10))state=0;
69      
70    
71    delay(500);
72}
73long microsecondsToInches(long microseconds)  {
74   return microseconds / 74 / 2;
75}
76