Make Your Own Stopwatch With Arduino

1/*Simple LCD stopwatch program with stop, start, reset and lap buttons.*/
2
3//including  liblary for LCD
4#include <LiquidCrystal.h> 
5
6//setting up LCD INPUT pins
7LiquidCrystal  lcd(12,11,10,9,8,7);// (RS,E D4,D5,D6,D7)
8
9//setting hours, minutes, secound  and miliseconds to 0
10int h=0;     
11int m=0;     
12int s=0;     
13int ms=0;    
14
15//defines pin for all buttons
16const int startPin = 3;    
17const  int stopPin = 4;    
18const int resetPin = 5;   
19    
20//defines starting  points
21int start=0;     
22int stop1=0;
23int reset=0;
24
25
26void stopwatch()
27{
28             
29  lcd.setCursor(3,0);   //setting start point on lcd 
30  lcd.print("TIME:");   //display TIME
31  lcd.print(h);         //display hours
32  lcd.print(":");      
33  lcd.print(m);         //display minutes
34  lcd.print(":"); 
35  lcd.print(s);         //display seconds
36  lcd.setCursor(3,1);
37  lcd.print("         ");
38 
39  ms=ms+10;           
40  delay(10); 
41   
42 if(ms==590)           
43  {
44   
45   ms=0; 
46   s=s+1; 
47  }
48  
49  if(s==60)     //if state for counting up minutes
50  { 
51  s=0; 
52  m=m+1; 
53  }
54
55  if(m==60)      //if state for counting up hours
56  {  
57  m=00; 
58  h=h+01;  
59  } 
60   
61   
62
63   stop1 = digitalRead(stopPin);  //reading buton  state
64 if(stop1 == HIGH)    //checking if button is pressed
65 {
66  stopwatch_stop();   //calls the stopwatch_stop function
67 }
68  else
69  {
70   stopwatch();    //calls the stopwatch function
71  }
72}
73
74void stopwatch_stop()
75{
76  lcd.setCursor(3,0); 
77  lcd.print("TIME:"); 
78  lcd.print(h); 
79  lcd.print(":");  
80  lcd.print(m); 
81  lcd.print(":"); 
82  lcd.print(s);
83  lcd.setCursor(3,1);
84  lcd.print("         ");
85      
86    
87   start = digitalRead(startPin);   //reading buton state
88 if(start == HIGH)
89 {
90  stopwatch();    //calls  the stopwatch function
91 } 
92 
93 reset = digitalRead(resetPin);   //reading  buton state
94 if(reset == HIGH)
95 {
96   stopwatch_reset();    //calls the  stopwatch_reset function
97   loop();
98  }
99 if(reset == LOW)
100 {
101  stopwatch_stop();    //calls the stopwatch_stop function
102 }
103}
104
105void stopwatch_reset()
106{
107  lcd.clear();
108 h=00;    //seting hours to 0
109 m=00;    //seting minutes to 0
110  s=00;    //seting seconds to 0
111 return;  //exiting the program and returning  to the point where entered the program
112}
113
114
115
116
117void setup() 
118{  
119  
120  
121  lcd.begin(16 ,2);  //starting LCD
122   
123  //defining pins  if they are INPUT or OUTPUT pins
124  pinMode(startPin, INPUT);  
125  pinMode(stopPin,  INPUT);
126  pinMode(resetPin, INPUT);
127  
128} 
129void loop() 
130{ 
131  
132  lcd.setCursor(3,1); 
133  lcd.print("STOPWATCH");  
134  lcd.setCursor(3,0);  
135  lcd.print("TIME:"); 
136  lcd.print(h); 
137  lcd.print(":"); 
138  lcd.print(m);  
139  lcd.print(":"); 
140  lcd.print(s);
141  
142 start = digitalRead(startPin);  //reading buton state
143 if(start == HIGH) 
144 {
145  stopwatch();  //calls the  stopwatch function
146 }
147}
148  
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