[Solved] Strobing to Light Four 7-Segment Displays; Not Working Properly

so got little 7-segment bubble display 4 digits sparkfun. got 1 of shift registers (74hc595n). i've had success in past getting these work together. have issue.

i'm trying timer using these. coded number, 300, scetch 4 different values: a=0,b=3,c=0,d=0. after squashing bugs, works.... except when reaches 0267, digits except last go blank (it remains on 8) , stops counting. thinkng arduino (uno) going bad after abuse sent through, uploaded code new(er) uno. still acts same. seems though stops executing code after time.

the 2 conditions in loop are

code: [select]

now=millis();
 
 while(millis() - < 1000){
and

code: [select]

seconds = (a*1000)+(b*100)+(c*10)+d;
if(seconds>0){

neither of 2 designed stop execution of code.

code: [select]

// define numbers
const int numbers[] = {0b11111100,0b01100000,0b11011010,0b11110010,0b01100110,0b10110110,0b00111110,0b11100000,0b11111110,0b11100110}; // 0-9

// set enable pin
const int en = 10; // set low when sending data

// these digits on display
const int a1 = 2;
const int a2 = 3;
const int a3 = 4;
const int a4 = 5;

//data,clock
const int sda = 7;
const int sck = 8;

//set digits
int a;
int b;
int c;
int d;

//we'll need these timing
int now;
int seconds;

void setup(){
 pinmode(en,output);
 pinmode(a1,output);
 pinmode(a2,output);
 pinmode(a3,output);
 pinmode(a4,output);
 pinmode(sda,output);
 pinmode(sck,output);
 digitalwrite(en,1);
 delay(10);
 digitalwrite(en,0);
 shiftout(sda,sck,lsbfirst,0);
 digitalwrite(en,1);
 
 a=0;
 b=3;
 c=0;
 d=0;
}

void loop(){
 now=millis();
 
 while(millis() - < 1000){
   digitalwrite(en,0);
   shiftout(sda,sck,lsbfirst,numbers[a]);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,1);
   digitalwrite(en,1);
   digitalwrite(a1,0);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,1);
   delay(1);
   digitalwrite(en,0);
   shiftout(sda,sck,lsbfirst,numbers[b]);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,1);
   digitalwrite(en,1);
   digitalwrite(a1,1);digitalwrite(a2,0);digitalwrite(a3,1);digitalwrite(a4,1);
   delay(1);
   digitalwrite(en,0);
   shiftout(sda,sck,lsbfirst,numbers[c]);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,1);
   digitalwrite(en,1);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,0);digitalwrite(a4,1);
   delay(1);
   digitalwrite(en,0);
   shiftout(sda,sck,lsbfirst,numbers[d]);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,1);
   digitalwrite(en,1);
   digitalwrite(a1,1);digitalwrite(a2,1);digitalwrite(a3,1);digitalwrite(a4,0);
   delay(1);
 }
 
 // subtract second
seconds = (a*1000)+(b*100)+(c*10)+d;
if(seconds>0){
 seconds--;
 a=seconds/1000;
 b=seconds/100 - (a*10);
 c=seconds/10 - (a*100) - (b*10);
 d=seconds - (a*1000) - (b*100) - (c*10);
}
}

hi free-bee

code: [select]

int now;

try changing variable unsigned long, match millis() function.  otherwise, overflow , go negative @ values greater 32767.  this happen 33s after program starts running, 267s on countdown.

code: [select]

unsigned long now;

regards

ray

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