Arduino Stopwatch

1#include <LiquidCrystal.h> //Libraries
2LiquidCrystal lcd(2, 3, 4, 5,  6, 7); //Arduino pins to lcd
3
4#define bt_start  A0
5#define bt_stop   A1
6#define  bt_reset  A2
7
8#define G_led 8 
9#define R_led 9 
10
11#define buzzer 13
12
13int  hh=0, mm=0, ss=0, ms=0; 
14bool timerStart = false;
15
16void setup() { // put  your setup code here, to run once 
17
18pinMode(bt_start, INPUT_PULLUP);
19pinMode(bt_stop,  INPUT_PULLUP);
20pinMode(bt_reset, INPUT_PULLUP);
21
22pinMode(R_led,OUTPUT);  // declare Red LED as output
23pinMode(G_led,OUTPUT); // declare Green LED as output
24pinMode(buzzer,OUTPUT);  // declare Buzzer as output 
25
26lcd.begin(16, 2); // Configura lcd numero columnas  y filas
27lcd.clear();
28lcd.setCursor (0,0);
29lcd.print("  Welcome  To  ");
30lcd.setCursor  (0,1);
31lcd.print("   Stopwatch   ");
32delay(2000);
33lcd.clear();
34 
35
36  noInterrupts();         // disable all interrupts
37 TCCR1A = 0;             //  set entire TCCR1A register to 0  //set timer1 interrupt at 1kHz  // 1 ms
38 TCCR1B  = 0;             // same for TCCR1B
39 TCNT1  = 0;             // set timer count  for 1khz increments
40 OCR1A = 1999;           // = (16*10^6) / (1000*8) - 1
41  //had to use 16 bit timer1 for this bc 1999>255, but could switch to timers 0 or  2 with larger prescaler
42 // turn on CTC mode
43 TCCR1B |= (1 << WGM12); // Set  CS11 bit for 8 prescaler
44 TCCR1B |= (1 << CS11);  // enable timer compare interrupt
45  TIMSK1 |= (1 << OCIE1A);
46 interrupts();           // enable
47
48}
49
50void  loop() {
51
52if(digitalRead (bt_start) == 0){ 
53digitalWrite(buzzer, HIGH);   
54timerStart = true; // Start stopwatch 
55delay(100);
56}
57
58if(digitalRead  (bt_stop) == 0){ 
59digitalWrite(buzzer, HIGH);   
60timerStart = false; // Stop  stopwatch 
61delay(100);
62}
63
64if(digitalRead (bt_reset) == 0){ 
65digitalWrite(buzzer,  HIGH);   
66ms=0, ss=0, mm=0, hh=0; // Reset stopwatch 
67delay(100);
68}
69
70lcd.setCursor  (0,0);
71lcd.print("   Stopwatch   ");
72
73lcd.setCursor (2,1);
74lcd.print((hh/10)%10);
75lcd.print(hh%10);
76lcd.print(":");
77lcd.print((mm/10)%10);
78lcd.print(mm%10);
79lcd.print(":");
80lcd.print((ss/10)%10);
81lcd.print(ss%10);
82lcd.print(":");
83lcd.print((ms/100)%10);
84lcd.print((ms/10)%10);
85lcd.print(ms%10);
86
87if(timerStart==true){
88digitalWrite(G_led,  HIGH); // Turn LED on.  
89digitalWrite(R_led, LOW);  // Turn LED off.
90}else{
91digitalWrite(G_led,  LOW); // Turn LED off.   
92digitalWrite(R_led, HIGH);  // Turn LED on. 
93}
94  
95digitalWrite(buzzer, LOW);
96}
97
98
99ISR(TIMER1_COMPA_vect){   
100if(timerStart  == true){ms=ms+1;
101if(ms>999){ms=0;ss=ss+1;
102if(ss>59){ss=0; mm=mm+1;}
103if(mm>59){mm=0;  hh=hh+1;}
104  }  
105 }
106}
107

1#include <LiquidCrystal.h> //Libraries
2LiquidCrystal lcd(2, 3, 4, 5,
3  6, 7); //Arduino pins to lcd
4
5#define bt_start  A0
6#define bt_stop   A1
7#define
8  bt_reset  A2
9
10#define G_led 8 
11#define R_led 9 
12
13#define buzzer 13
14
15int
16  hh=0, mm=0, ss=0, ms=0; 
17bool timerStart = false;
18
19void setup() { // put
20  your setup code here, to run once 
21
22pinMode(bt_start, INPUT_PULLUP);
23pinMode(bt_stop,
24  INPUT_PULLUP);
25pinMode(bt_reset, INPUT_PULLUP);
26
27pinMode(R_led,OUTPUT);
28  // declare Red LED as output
29pinMode(G_led,OUTPUT); // declare Green LED as output
30pinMode(buzzer,OUTPUT);
31  // declare Buzzer as output 
32
33lcd.begin(16, 2); // Configura lcd numero columnas
34  y filas
35lcd.clear();
36lcd.setCursor (0,0);
37lcd.print("  Welcome  To  ");
38lcd.setCursor
39  (0,1);
40lcd.print("   Stopwatch   ");
41delay(2000);
42lcd.clear();
43 
44
45
46  noInterrupts();         // disable all interrupts
47 TCCR1A = 0;             //
48  set entire TCCR1A register to 0  //set timer1 interrupt at 1kHz  // 1 ms
49 TCCR1B
50  = 0;             // same for TCCR1B
51 TCNT1  = 0;             // set timer count
52  for 1khz increments
53 OCR1A = 1999;           // = (16*10^6) / (1000*8) - 1
54
55  //had to use 16 bit timer1 for this bc 1999>255, but could switch to timers 0 or
56  2 with larger prescaler
57 // turn on CTC mode
58 TCCR1B |= (1 << WGM12); // Set
59  CS11 bit for 8 prescaler
60 TCCR1B |= (1 << CS11);  // enable timer compare interrupt
61
62  TIMSK1 |= (1 << OCIE1A);
63 interrupts();           // enable
64
65}
66
67void
68  loop() {
69
70if(digitalRead (bt_start) == 0){ 
71digitalWrite(buzzer, HIGH);
72   
73timerStart = true; // Start stopwatch 
74delay(100);
75}
76
77if(digitalRead
78  (bt_stop) == 0){ 
79digitalWrite(buzzer, HIGH);   
80timerStart = false; // Stop
81  stopwatch 
82delay(100);
83}
84
85if(digitalRead (bt_reset) == 0){ 
86digitalWrite(buzzer,
87  HIGH);   
88ms=0, ss=0, mm=0, hh=0; // Reset stopwatch 
89delay(100);
90}
91
92lcd.setCursor
93  (0,0);
94lcd.print("   Stopwatch   ");
95
96lcd.setCursor (2,1);
97lcd.print((hh/10)%10);
98lcd.print(hh%10);
99lcd.print(":");
100lcd.print((mm/10)%10);
101lcd.print(mm%10);
102lcd.print(":");
103lcd.print((ss/10)%10);
104lcd.print(ss%10);
105lcd.print(":");
106lcd.print((ms/100)%10);
107lcd.print((ms/10)%10);
108lcd.print(ms%10);
109
110if(timerStart==true){
111digitalWrite(G_led,
112  HIGH); // Turn LED on.  
113digitalWrite(R_led, LOW);  // Turn LED off.
114}else{
115digitalWrite(G_led,
116  LOW); // Turn LED off.   
117digitalWrite(R_led, HIGH);  // Turn LED on. 
118}
119
120  
121digitalWrite(buzzer, LOW);
122}
123
124
125ISR(TIMER1_COMPA_vect){   
126if(timerStart
127  == true){ms=ms+1;
128if(ms>999){ms=0;ss=ss+1;
129if(ss>59){ss=0; mm=mm+1;}
130if(mm>59){mm=0;
131  hh=hh+1;}
132  }  
133 }
134}
135