LCD Stopwatch, with Split time

A simple stopwatch that can store up to 4 split times.

Dec 25, 2019

•

13305 views

•

8 respects

clocks

Components and supplies

Breadboard (generic)

Tactile Switch, Top Actuated

Arduino UNO

Rotary potentiometer (generic)

Alphanumeric LCD, 16 x 2

Jumper wires (generic)

Project description

Code

arduino

1#include <LiquidCrystal.h>
2//PIN 5 R/W to Ground, for writing
3//LCD  Mode : 4 data pin
4//Functions: Start, stop, saving up to 4 partial time in memory.
5//10  millis = 1 hundredth of a second. The chronometer measures hour, minutes, seconds,  and hundredths of a second.
6
7//Buttons with internal Pullup, so if they get  pressed we get LOW
8const int start = 8;  //Start the stopwatch
9const int pausa  = 9;  //Pausa
10const int partial = 10;  //Save a partial
11const int scroll_partial  = 11;  //If paused, check the 4 last saved partial 
12int x = 0; //Variable to  manage the loop
13
14//LCD
15int lcdclear = 0; //this to variables are needed  for managing
16int Display = 0; //the display, to clear and print
17
18//chronometer
19int  cents = 0;
20int seconds = 0;  
21int minutes = 0;
22int hours = 0;
23const  int interval = 10; //Every 10 milliseconds i increase  1 cent
24unsigned long previousMillis  = 0;
25int c1, c2, s1, s2, m1, m2, h; //Variables used to put in the form 
26                              //h:m2m1:s2s1:c2c1
27
28//Partial: I save 4 partial,  that can be seen if stopwatch is stopped
29int partial2[7]; //penultimate partial  (The one that stays in Old). The last partial stays in New:
30int partial3[7];  
31int partial4[7]; 
32int scrolling = 0; //Used to scroll the saved partial times
33
34
35LiquidCrystal  lcd(2, 3, 4, 5, 6, 7); // RS-Enable-D4-D5-D6-D7 in that digitalPin
36
37void setup()  {
38  pinMode(start, INPUT_PULLUP); //In the schematic from right to left
39  pinMode(pausa,  INPUT_PULLUP);//there are start-pausa-partial-scroll_partial
40  pinMode(partial,  INPUT_PULLUP);
41  pinMode(scroll_partial, INPUT_PULLUP);
42  lcd.begin(16,2);
43  lcd.print("Press start");
44
45}
46
47void loop() {
48  if (x == 0) {  //Initially  is 0
49    while(digitalRead(start) == HIGH) {};  //Until i press the button, the  chronometer doesn't start
50  x++; //When i press the button, i go out from this  cycle, x++ and i cannot return here anymore
51  }
52  if (lcdclear == 0){   //Condition  to clear the display, used in the various functions
53    lcd.clear();
54    lcdclear++;
55  }
56  if (Display == 0){ //Also this is used to clear display
57  lcd.home();
58  lcd.print("Now:  ");  //With this condition, i can print "Now: " one single  time, otherwise the chronometer wouldn't be precise
59  Display++; 
60  scrolling  = 0; //When i exit from the partial menu, then if i go in the partial menu again  i always get in PAR1 and PAR2
61  }              
62  chronometer(); //At the  end of every increase, i control if stop is pressed. And also if the partial function  is pressed
63  pause();
64  f_partial();
65}
66
67void chronometer(void){   //This  function print:   "New: Actual time"
68  unsigned long currentMillis = millis();  //If for the updating. If it is true, it means 1 cent of a second had passed.  Update cents, minutes, seconds, hours and then i write on the lcd
69  if (currentMillis  - previousMillis >= interval) {  
70    previousMillis = currentMillis;
71    cents++;
72    if (cents == 100){
73      cents = 0;
74      seconds++;
75      if (seconds  == 60) {
76        seconds = 0;
77        minutes++;
78        if (minutes ==  60){
79          minutes = 0; 
80          hours++;
81          if (hours ==  24)
82            hours = 0;
83          }
84      }
85   }
86    int cent  = cents;
87    int sec = seconds;
88    int minu = minutes; //Taking the digits  separeted
89    h = hours;  //For the other funcionts, so i can put hours = 0 and  h still is the last value
90    c1 = cent%10;
91    cent /= 10;
92    c2 = cent%10;
93    s1 = sec%10;
94    sec /= 10;
95    s2 = sec%10;
96    m1 = minu%10;
97    minu /= 10;
98    m2 = minu%10;
99    lcd.setCursor(6, 0);
100    lcd.print(h);
101    lcd.print(':');
102    lcd.print(m2);
103    lcd.print(m1);
104    lcd.print(':');
105    lcd.print(s2);
106    lcd.print(s1);
107    lcd.print(':');
108    lcd.print(c2);
109    lcd.print(c1); 
110  } 
111}
112
113void scrollPartial(void){
114    while(digitalRead(scroll_partial)  == LOW) {}; //Debounce, as long as i press the button the real function doesn't  start
115    if (scrolling == 0) { //Visualize the last 2 partials
116    lcd.clear();  
117    lcd.home();
118    lcd.print("PAR1:");
119    lcd.setCursor(6, 0);
120    lcd.print(h);
121    lcd.print(':');
122    lcd.print(m2);
123    lcd.print(m1);
124    lcd.print(':');
125    lcd.print(s2);
126    lcd.print(s1);
127    lcd.print(':');
128    lcd.print(c2);
129    lcd.print(c1);
130    lcd.setCursor(0, 1);
131    lcd.print("PAR2:");
132    lcd.setCursor(6, 1);
133    lcd.print(partial2[0]);
134    lcd.print(':');
135    lcd.print(partial2[1]);
136    lcd.print(partial2[2]);
137    lcd.print(':');
138    lcd.print(partial2[3]);
139    lcd.print(partial2[4]);
140    lcd.print(':');
141    lcd.print(partial2[5]);
142    lcd.print(partial2[6]); 
143    Display = 0;  //When i press start the display must be cleared
144    lcdclear = 0; //When i press  start the display must be cleared
145    cents = seconds = minutes = hours  = 0;
146    scrolling++;
147  }
148  else if (scrolling == 1){ //Visualize 3th and 4th partial
149    lcd.clear();
150    lcd.home();
151    lcd.print("PAR3:");
152    lcd.setCursor(6,  0);
153    lcd.print(partial3[0]);
154    lcd.print(':');
155    lcd.print(partial3[1]);
156    lcd.print(partial3[2]);
157    lcd.print(':');
158    lcd.print(partial3[3]);
159    lcd.print(partial3[4]);
160    lcd.print(':');
161    lcd.print(partial3[5]);
162    lcd.print(partial3[6]);
163    lcd.setCursor(0, 1);
164    lcd.print("PAR4:");
165    lcd.setCursor(6, 1);
166    lcd.print(partial4[0]);
167    lcd.print(':');
168    lcd.print(partial4[1]);
169    lcd.print(partial4[2]);
170    lcd.print(':');
171    lcd.print(partial4[3]);
172    lcd.print(partial4[4]);
173    lcd.print(':');
174    lcd.print(partial4[5]);
175    lcd.print(partial4[6]); 
176    Display = 0;  //When i press start the display must be cleared
177    lcdclear = 0; //When i press  start the display must be cleared
178    cents = seconds = minutes = hours  = 0;
179    scrolling = 0;
180    
181  }
182  
183} 
184
185
186void pause(void){  //If  pause is pressed, i stop in this function until start doesn't get pressed again
187      if (digitalRead(pausa) == HIGH) 
188        return;
189      else if (digitalRead(pausa)  == LOW){ //Stuck in this cycle until i press start
190        while(digitalRead(start)  == HIGH) {  
191          if (digitalRead(scroll_partial) == LOW) //If i press the  button for seeing the partial, i enter in that function
192            scrollPartial();    //When scrollPartial() ends, i'm still in this function, so if i press start  the chronometer starts back normal
193          }
194    } 
195}
196
197void f_partial(void){   //If this button is pressed, i put the current value of New in Old, and a new  crhonometer starts
198  if (digitalRead(partial) == HIGH)
199    return;
200  else  if (digitalRead(partial) == LOW ){ 
201   lcd.clear();
202   lcd.setCursor(0, 1);  //The values calculated in the function chronometer can be used,  h,m,s,c
203   lcd.print("Old:  ");
204   lcd.setCursor(6, 1);
205   lcd.print(h);
206   lcd.print(':');
207   lcd.print(m2);
208   lcd.print(m1);
209   lcd.print(':');
210   lcd.print(s2);
211   lcd.print(s1);
212   lcd.print(':');
213   lcd.print(c2);
214   lcd.print(c1);   //When i come here,  i've got the old values for h,m,s,c,                       i save it in the partial  array
215   Display = 0;   //The new is written again 
216   cents = 0;
217   seconds  = 0;
218   minutes = 0;
219   hours = 0;
220
221   partial4[0] = partial3[0]; //Partial4[]  is updated with the old partial3[]
222   partial4[1] = partial3[1];
223   partial4[2]  = partial3[2];
224   partial4[3] = partial3[3];
225   partial4[4] = partial3[4];
226   partial4[5] = partial3[5];
227   partial4[6] = partial3[6];
228   
229     
230   partial3[0] = partial2[0]; //Partial3[] is updated with the old partial2[]
231   partial3[1] = partial2[1];
232   partial3[2] = partial2[2];
233   partial3[3]  = partial2[3];
234   partial3[4] = partial2[4];
235   partial3[5] = partial2[5];
236   partial3[6] = partial2[6];
237    
238   partial2[0] = h;    //Update partial2  with OLD
239   partial2[1] = m2;
240   partial2[2] = m1;
241   partial2[3] = s2;
242   partial2[4] = s1;
243   partial2[5] = c2;
244   partial2[6] = c1;
245  
246   while(digitalRead(partial)  == LOW) {}; //Debounce, until i press the button i stay here
247  } 
248}

#include <LiquidCrystal.h>
//PIN 5 R/W to Ground, for writing
//LCD  Mode : 4 data pin
//Functions: Start, stop, saving up to 4 partial time in memory.
//10  millis = 1 hundredth of a second. The chronometer measures hour, minutes, seconds,  and hundredths of a second.

//Buttons with internal Pullup, so if they get  pressed we get LOW
const int start = 8;  //Start the stopwatch
const int pausa  = 9;  //Pausa
const int partial = 10;  //Save a partial
const int scroll_partial  = 11;  //If paused, check the 4 last saved partial 
int x = 0; //Variable to  manage the loop

//LCD
int lcdclear = 0; //this to variables are needed  for managing
int Display = 0; //the display, to clear and print

//chronometer
int  cents = 0;
int seconds = 0;  
int minutes = 0;
int hours = 0;
const  int interval = 10; //Every 10 milliseconds i increase  1 cent
unsigned long previousMillis  = 0;
int c1, c2, s1, s2, m1, m2, h; //Variables used to put in the form 
                              //h:m2m1:s2s1:c2c1

//Partial: I save 4 partial,  that can be seen if stopwatch is stopped
int partial2[7]; //penultimate partial  (The one that stays in Old). The last partial stays in New:
int partial3[7];  
int partial4[7]; 
int scrolling = 0; //Used to scroll the saved partial times


LiquidCrystal  lcd(2, 3, 4, 5, 6, 7); // RS-Enable-D4-D5-D6-D7 in that digitalPin

void setup()  {
  pinMode(start, INPUT_PULLUP); //In the schematic from right to left
  pinMode(pausa,  INPUT_PULLUP);//there are start-pausa-partial-scroll_partial
  pinMode(partial,  INPUT_PULLUP);
  pinMode(scroll_partial, INPUT_PULLUP);
  lcd.begin(16,2);
  lcd.print("Press start");

}

void loop() {
  if (x == 0) {  //Initially  is 0
    while(digitalRead(start) == HIGH) {};  //Until i press the button, the  chronometer doesn't start
  x++; //When i press the button, i go out from this  cycle, x++ and i cannot return here anymore
  }
  if (lcdclear == 0){   //Condition  to clear the display, used in the various functions
    lcd.clear();
    lcdclear++;
  }
  if (Display == 0){ //Also this is used to clear display
  lcd.home();
  lcd.print("Now:  ");  //With this condition, i can print "Now: " one single  time, otherwise the chronometer wouldn't be precise
  Display++; 
  scrolling  = 0; //When i exit from the partial menu, then if i go in the partial menu again  i always get in PAR1 and PAR2
  }              
  chronometer(); //At the  end of every increase, i control if stop is pressed. And also if the partial function  is pressed
  pause();
  f_partial();
}

void chronometer(void){   //This  function print:   "New: Actual time"
  unsigned long currentMillis = millis();  //If for the updating. If it is true, it means 1 cent of a second had passed.  Update cents, minutes, seconds, hours and then i write on the lcd
  if (currentMillis  - previousMillis >= interval) {  
    previousMillis = currentMillis;
    cents++;
    if (cents == 100){
      cents = 0;
      seconds++;
      if (seconds  == 60) {
        seconds = 0;
        minutes++;
        if (minutes ==  60){
          minutes = 0; 
          hours++;
          if (hours ==  24)
            hours = 0;
          }
      }
   }
    int cent  = cents;
    int sec = seconds;
    int minu = minutes; //Taking the digits  separeted
    h = hours;  //For the other funcionts, so i can put hours = 0 and  h still is the last value
    c1 = cent%10;
    cent /= 10;
    c2 = cent%10;
    s1 = sec%10;
    sec /= 10;
    s2 = sec%10;
    m1 = minu%10;
    minu /= 10;
    m2 = minu%10;
    lcd.setCursor(6, 0);
    lcd.print(h);
    lcd.print(':');
    lcd.print(m2);
    lcd.print(m1);
    lcd.print(':');
    lcd.print(s2);
    lcd.print(s1);
    lcd.print(':');
    lcd.print(c2);
    lcd.print(c1); 
  } 
}

void scrollPartial(void){
    while(digitalRead(scroll_partial)  == LOW) {}; //Debounce, as long as i press the button the real function doesn't  start
    if (scrolling == 0) { //Visualize the last 2 partials
    lcd.clear();  
    lcd.home();
    lcd.print("PAR1:");
    lcd.setCursor(6, 0);
    lcd.print(h);
    lcd.print(':');
    lcd.print(m2);
    lcd.print(m1);
    lcd.print(':');
    lcd.print(s2);
    lcd.print(s1);
    lcd.print(':');
    lcd.print(c2);
    lcd.print(c1);
    lcd.setCursor(0, 1);
    lcd.print("PAR2:");
    lcd.setCursor(6, 1);
    lcd.print(partial2[0]);
    lcd.print(':');
    lcd.print(partial2[1]);
    lcd.print(partial2[2]);
    lcd.print(':');
    lcd.print(partial2[3]);
    lcd.print(partial2[4]);
    lcd.print(':');
    lcd.print(partial2[5]);
    lcd.print(partial2[6]); 
    Display = 0;  //When i press start the display must be cleared
    lcdclear = 0; //When i press  start the display must be cleared
    cents = seconds = minutes = hours  = 0;
    scrolling++;
  }
  else if (scrolling == 1){ //Visualize 3th and 4th partial
    lcd.clear();
    lcd.home();
    lcd.print("PAR3:");
    lcd.setCursor(6,  0);
    lcd.print(partial3[0]);
    lcd.print(':');
    lcd.print(partial3[1]);
    lcd.print(partial3[2]);
    lcd.print(':');
    lcd.print(partial3[3]);
    lcd.print(partial3[4]);
    lcd.print(':');
    lcd.print(partial3[5]);
    lcd.print(partial3[6]);
    lcd.setCursor(0, 1);
    lcd.print("PAR4:");
    lcd.setCursor(6, 1);
    lcd.print(partial4[0]);
    lcd.print(':');
    lcd.print(partial4[1]);
    lcd.print(partial4[2]);
    lcd.print(':');
    lcd.print(partial4[3]);
    lcd.print(partial4[4]);
    lcd.print(':');
    lcd.print(partial4[5]);
    lcd.print(partial4[6]); 
    Display = 0;  //When i press start the display must be cleared
    lcdclear = 0; //When i press  start the display must be cleared
    cents = seconds = minutes = hours  = 0;
    scrolling = 0;
    
  }
  
} 


void pause(void){  //If  pause is pressed, i stop in this function until start doesn't get pressed again
      if (digitalRead(pausa) == HIGH) 
        return;
      else if (digitalRead(pausa)  == LOW){ //Stuck in this cycle until i press start
        while(digitalRead(start)  == HIGH) {  
          if (digitalRead(scroll_partial) == LOW) //If i press the  button for seeing the partial, i enter in that function
            scrollPartial();    //When scrollPartial() ends, i'm still in this function, so if i press start  the chronometer starts back normal
          }
    } 
}

void f_partial(void){   //If this button is pressed, i put the current value of New in Old, and a new  crhonometer starts
  if (digitalRead(partial) == HIGH)
    return;
  else  if (digitalRead(partial) == LOW ){ 
   lcd.clear();
   lcd.setCursor(0, 1);  //The values calculated in the function chronometer can be used,  h,m,s,c
   lcd.print("Old:  ");
   lcd.setCursor(6, 1);
   lcd.print(h);
   lcd.print(':');
   lcd.print(m2);
   lcd.print(m1);
   lcd.print(':');
   lcd.print(s2);
   lcd.print(s1);
   lcd.print(':');
   lcd.print(c2);
   lcd.print(c1);   //When i come here,  i've got the old values for h,m,s,c,                       i save it in the partial  array
   Display = 0;   //The new is written again 
   cents = 0;
   seconds  = 0;
   minutes = 0;
   hours = 0;

   partial4[0] = partial3[0]; //Partial4[]  is updated with the old partial3[]
   partial4[1] = partial3[1];
   partial4[2]  = partial3[2];
   partial4[3] = partial3[3];
   partial4[4] = partial3[4];
   partial4[5] = partial3[5];
   partial4[6] = partial3[6];
   
     
   partial3[0] = partial2[0]; //Partial3[] is updated with the old partial2[]
   partial3[1] = partial2[1];
   partial3[2] = partial2[2];
   partial3[3]  = partial2[3];
   partial3[4] = partial2[4];
   partial3[5] = partial2[5];
   partial3[6] = partial2[6];
    
   partial2[0] = h;    //Update partial2  with OLD
   partial2[1] = m2;
   partial2[2] = m1;
   partial2[3] = s2;
   partial2[4] = s1;
   partial2[5] = c2;
   partial2[6] = c1;
  
   while(digitalRead(partial)  == LOW) {}; //Debounce, until i press the button i stay here
  } 
}

Downloadable files

Breadboard schematic

Comments

Only logged in users can leave comments

Zuba98

0 Followers

•

0 Projects

Intro