Hi guys!
I'm trying to make a stopwatch with 4 separate 7 segment displays using timer register. I already have a functional circuit and I found a similiar code HERE that uses this register.
BUT. This code is showing in MM:SS format. And I want SS:100/SS. What I need to change in the code to have this format?
When I change the TCCR1B in loop from 0x04 to 0x02 timer will interrupt every 0,5 ms. This is closer to my goal but every second on this timer is about 3 seconds on my original stopwatch timer.
HERE is the video of counting..
Here is the main part of timer settings (line 313-334):
TIMSK1=0x01; // enabled global and timer overflow interrupt;
TCCR1A = 0x00; // normal operation 148 page (mode0);
TCNT1=0x0BDC; // real 1 second timer
TCCR1B = 0x00; // stop hardware timer
void loop ()
{
if (!digitalRead(Button_start)&&!b) {
if (!set_mode) { if (run) {TCCR1B=0x00; run=0;} else {TCCR1B=0x04; run=1;}}
Please help me 
Thank you
Jan
#include <avr/io.h>
#include <avr/interrupt.h>
int F = 23;
int G = 22;
int A = 24;
int B = 25;
int E = 26;
int D = 27;
int C = 28;
int DP = 29;
// Commonn cathodes control
#define GND1 30
#define GND2 31
#define GND3 32
#define GND4 33
#define Button_start 48
#define Button_set 49
///
#define Buzzer 46
#define LED 47 // or relay insted
int i=0;
char run=0; // shows if timer is runnig
int b=0; //for buttons
int c=0;
int d=0; // for buzzer
char set_mode=0; // shows if timer is in setup mode
char alarm =0; // if "1" buzzer is on
int default_Sec=00;
int default_Min=00;
int Sec;
int Min;
//timer interrupt
ISR(TIMER1_OVF_vect) {
Sec++; // timer values decreases
TCNT1=0x0BDC;
}
void digit0 () {
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, HIGH);
};
void digit1 () {
digitalWrite(A,HIGH);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit2 () {
digitalWrite(A,LOW);
digitalWrite(B, LOW);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, HIGH);
digitalWrite(G, LOW);
};
void digit3 () {
digitalWrite(A,LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, LOW);
};
void digit4 () {
digitalWrite(A,HIGH);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit5 () {
digitalWrite(A,LOW);
digitalWrite(B, HIGH);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit6 () {
digitalWrite(A,LOW);
digitalWrite(B, HIGH);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit7 () {
digitalWrite(A,LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(G, HIGH);
};
void digit8 () {
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void digit9 () {
digitalWrite(A, LOW);
digitalWrite(B, LOW);
digitalWrite(C, LOW);
digitalWrite(D, LOW);
digitalWrite(E, HIGH);
digitalWrite(F, LOW);
digitalWrite(G, LOW);
};
void showdigit (int digit)
{
switch (digit) {
case 0:
digit0 ();
break;
case 1:
digit1 ();
break;
case 2:
digit2 ();
break;
case 3:
digit3 ();
break;
case 4:
digit4 ();
break;
case 5:
digit5 ();
break;
case 6:
digit6 ();
break;
case 7:
digit7 ();
break;
case 8:
digit8 ();
break;
case 9:
digit9 ();
break;
default:
break;
};
};
void showdigits (int number, char digit_on, char decimal_point)
{
digitalWrite(GND4, LOW);
// e.g. we have "1234"
showdigit(number/1000);
if (decimal_point&8) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&8) {
digitalWrite(GND1, HIGH);
digitalWrite(GND2, LOW);
digitalWrite(GND3, LOW);
}
delay (1);
number = number%1000;
digitalWrite(GND1, LOW);
showdigit(number/100);
if (decimal_point&4) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&4) {
digitalWrite(GND2, HIGH);
} delay (1);
number =number%100;
digitalWrite(GND2, LOW);
showdigit(number/10);
if (decimal_point&2) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&2) {
digitalWrite(GND3, HIGH);
}
delay (1);
number =number%10;
digitalWrite(GND3, LOW);
showdigit(number);
if (decimal_point&1) {digitalWrite(DP, HIGH);} else {digitalWrite(DP, LOW);};
if (digit_on&1) {
digitalWrite(GND4, HIGH);
}
delay (1);
};
void setup()
{
pinMode(A, OUTPUT);
pinMode(B, OUTPUT);
pinMode(C, OUTPUT);
pinMode(D, OUTPUT);
pinMode(E, OUTPUT);
pinMode(F, OUTPUT);
pinMode(G, OUTPUT);
pinMode(DP, OUTPUT);
pinMode(GND1, OUTPUT);
pinMode(GND2, OUTPUT);
pinMode(GND3, OUTPUT);
pinMode(GND4, OUTPUT);
pinMode(Button_start, INPUT);
digitalWrite(Button_start, HIGH); //pull up resistor
pinMode(Button_set, INPUT);
digitalWrite(Button_set, HIGH); //pull up resistor
pinMode(LED, OUTPUT);
TIMSK1=0x01; // enabled global and timer overflow interrupt;
TCCR1A = 0; // normal operation 148 page (mode0);
TCNT1=0x0BDC;
TCCR1B = 0x00; // stop hardware timer
// loading default timer values
Sec = default_Sec ;
Min = default_Min ;
};
void loop ()
{
//////////// button_start//////////
if (!digitalRead(Button_start)&&!b) {
if (!set_mode) { if (run) {TCCR1B=0x00; run=0;} else {TCCR1B=0x02; run=1;}}
if (set_mode) {b=25;} else b=100;
};
if (!b==0) b--;
//////////// button_set/////////
if (!digitalRead(Button_set)&&!c) {
if(!run&&!set_mode) {Min=default_Min; Sec=default_Sec;}
c=100; };
if (!c==0) c--;
if (Min==100) {Min=00;}
if (Sec==100) {Min++;Sec=00;}
//decimal point indication control
if (!set_mode) {
if (!(Sec%2)) { showdigits (Min*100+Sec,0x0F,0x04); } //0X00
else {showdigits (Min*100+Sec,0x0F,0x00); }; //0000
}
if (run) { // to do while timer is running; e.g. control relay
digitalWrite(LED, HIGH);
} else digitalWrite(LED, LOW);
};
