Stopwatch using a 32 x 16 LED Matrix. DMD P10 RED single colorNEED HELP!

[Oniduino]

@b707

@Oniduino

Like my generic stopwatch can save more than 10 memory splits time

Add a button @Save@ and put the current time to the variable for using it later. If you need to store ten times - make an array with 10 elements.

Can you give me xample...to my sketch that I made

[Oniduino]

@b707

@Oniduino

My first generic stopwatch with 10 memory split

Are you who made it? And you who wrote the firmware? So you have a code to store the time splits to the memory. The code doesn't depend on type of the display, you can use the code from that stopwatch to the new one

Haha..Im not pro..Im not made it

[b707]

You code is not suitable for the stopwatch.
Stopwatch must not use delay() functions.

Again, are you call the Result() from the function itself?

@Oniduino

void Result(){
sprintf(lineBuff,"%02d:%02d:%02d",Minutes,Seconds,Cents);
dmd.selectFont(Mono5x7);
dmd.drawString( 1,2,lineBuff,strlen(lineBuff),GRAPHICS_NORMAL); 
Result();  
}

this is an infinite recursion which will cause the program to hang.

[b707]

@Oniduino

Im not made it

So I don't understand, what you meant:

@Oniduino

I have adapted a sketch for a stopwatch using an 16 x 2 LCD display

[Oniduino]

I try to analyze the sketch and try it for dot matrix displays

[Oniduino]

@b707

You code is not suitable for the stopwatch.
Stopwatch must not use delay() functions.

Again, are you call the Result() from the function itself?

@Oniduino

void Result(){
sprintf(lineBuff,"%02d:%02d:%02d",Minutes,Seconds,Cents);
dmd.selectFont(Mono5x7);
dmd.drawString( 1,2,lineBuff,strlen(lineBuff),GRAPHICS_NORMAL); 
Result();  
}

this is an infinite recursion which will cause the program to hang.

Stay in Result() until I push reset

[Oniduino]

Reset on board arduino

[b707]

@Oniduino

Stay in Result() until I push reset

Did you try it?
This code won't "stay in...", it will hang the board almost immediately.

If you want to stay in the function - use infinite while loop:

while (1);

Do not use recursion if you don't understand it.

[Oniduino]

Its work normali

[b707]

@Oniduino

Its work normali

No, it is impossible.
Perhaps you didn't try to run the code to the second lap.

Do not use recursion if you don't understand it.

[Oniduino]

#include <Wire.h>
#include <SPI.h>        //SPI.h must be included as DMD is written by SPI (the IDE complains otherwise)
#include <DMD.h>        //Library DMD yang menyediakan fungsi penampilan teks, gambar dsb
#include <TimerOne.h>   //Library peripheral Timer1 untuk menjalankan prosedur pindai panel DMD
#include <Time.h>     //Library waktu yang menyediakan tipe data, struktur, dan obyek waktu

#include "Mono5x7.h"




#define DISPLAY_COLUMN_COUNT  3
#define DISPLAY_ROW_COUNT     2

#define PIXELS_PER_COLUMN  32
#define PIXELS_PER_ROW    16

DMD dmd(DISPLAY_COLUMN_COUNT, DISPLAY_ROW_COUNT);
unsigned char show = 0;

char lineBuff[20];
char lineBuff2[20];

int lineA;       
int Start;

int minutes;
int seconds;
int cents;
long start_time = 0;



void ScanDMD()
{
  dmd.scanDisplayBySPI();
}


void setup(void)
{

pinMode(2,INPUT_PULLUP);
pinMode(3,INPUT_PULLUP);
pinMode(4,INPUT_PULLUP);
  dmd.clearScreen( true );   //true is normal (all pixels off), false is negative (all pixels on)
  Serial.begin(9600);
   //initialize TimerOne's interrupt/CPU usage used to scan and refresh the display
  Timer1.initialize( 1000 );           //period in microseconds to call ScanDMD. Anything longer than 5000 (5ms) and you can see flicker.
  Timer1.attachInterrupt( ScanDMD );   //attach the Timer1 interrupt to ScanDMD which goes to dmd.scanDisplayBySPI() 
  //clear/init the DMD pixels held in RAM
  dmd.clearScreen( true );
}


void loop()
{
  lineA = digitalRead(2);
  if((lineA == 0)&&(Start == 0)){
  delay(200);
  Start = 1;
  start_time = millis(); 
}  
  Chronometer();
  Pause();
  Laptime();
 
}



void Chronometer(void){  
if(Start == 1){
minutes = (millis() - start_time) / 60000;
seconds = ((millis() - start_time) / 1000) % 60;
cents = ((millis() - start_time) / 10) % 100;
}
//===========================================================================  
sprintf(lineBuff, "%02d:%02d.%02d",minutes,seconds,cents);
dmd.selectFont(Mono5x7);
dmd.drawString( 1,  2, lineBuff, strlen(lineBuff), GRAPHICS_NORMAL); 
//===========================================================================
}

void Pause(void){
if(digitalRead(4) == HIGH)
return;
else if (digitalRead(4) == LOW){
while(digitalRead(2)  == HIGH) { 
if (digitalRead(3) == LOW)
Laptime(); 
  }
}
}

void Split(void){
if(digitalRead(3) == HIGH)
return;
else if (digitalRead(3) == LOW){
Laptime();
}
}


void Laptime(void){
if(digitalRead(3) == HIGH)
return;
else if (digitalRead(3) == LOW){
sprintf(lineBuff, "%02d:%02d.%02d",minutes,seconds,cents);
dmd.selectFont(Mono5x7);
dmd.drawString( 1,  10, lineBuff, strlen(lineBuff), GRAPHICS_NORMAL);
  while(digitalRead(3)  == LOW) {};
}
}
![IMG_20230525_233621|375x500](upload://3ZXxqDp7sakR9XP9EsP0HX0DoeK.jpeg)

[Oniduino]

[Oniduino]

how do you add a split lap, second, third and so on?

[b707]

In the Pause() procedure, there is no point in calling Laptime() in a loop:

@Oniduino

while(digitalRead(2)  == HIGH) 
{ 
   if (digitalRead(3) == LOW)  Laptime(); 
  }

the time inside this procedure is not updated, so the stopwatch display will stand still. And if so, it means that it is enough to display the data on the screen once

[Oniduino]

Yes, that's true. Even the time doesn't stop properly when paused, only the display stops

What should I do?

[b707]

@Oniduino

Even the time doesn't stop properly when paused, only the display stops

It is because the millis() doesn't stop when you enter to the Pause() function

[Oniduino]

how do i pause of millis?