Stopwatch arduino genuino uno

Projects Programming
1

Hello, Im in big trouble.. actually we have a test in school And I need to do stopwatch on A1,A2,A3 buttons with START, STOP, RESET.. i dont really know what to do..And how to do it. I have this code for numbers but I need to do it in stopwatch form.. please help.. heres my code atm

#define latchPin 4
#define clockPin 7
#define dataPin 8
#define button A1
int x,y,cnt=0;
long timer=0;
const byte segment[] = {B00000011, B10011111, 0B00100101, 0B00001101, 0B10011001,
0B01001001, 0B01000001, 0B00011111, 0B00000001/, 0B00001001, 0B00010001,
0B11000001, 0B01100011, 0B10000101, 0B01100001, 0B01110001/};
const byte digit[] = {0x01, 0x02, 0x04, 0x08};

void setup() {
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
if(millis()>timer+100)
{
timer=millis();
cnt++;
if(cnt==10000) cnt=0;
}
gg(segment[cnt%10], digit[3]);
gg(segment[cnt%100/10], digit[2]);
gg(segment[cnt%1000/100], digit[1]);
gg(segment[cnt%10000/1000], digit[0]);
}
void gg(int x, int y)
{

digitalWrite(latchPin, LOW);
shiftOut(dataPin, clockPin, LSBFIRST, x);
shiftOut(dataPin, clockPin, MSBFIRST, y);
digitalWrite(latchPin, HIGH);

}

PM: I dont know how to do quetoes on mobile, so im sorry for that

2

What does your code currently do? What display do you use, and what does it display? You should see the numbers os tenth of seconds dynamically displayed.

So you just have to add the buttons management. Try to find some tutorial on the net. You can start here, whoch shows the basics.