Arduino Duemilanove and shutter speed mettering

hallo,

i'm trying calibrate shutter speed of digital camera arduino. have matrix of 64 leds , problem time delay between 2 shining leds. take foto of matrix , count shining leds. example, shutter speed 1/45 s = 22 ms, time delay between leds 1ms, on photograph 11 shining leds.



my code:

code: [select]

// definovani pinu rady
const int radek[8] = {
 10,12,18,11,14,15,17,16 };

// definovani pinu sloupce
const int sloupec[8] = {
 9,8,7,6,5,4,3,2};
 
// definovani doby svitu diody  
const int svitit = 1;

// pri startu se spusti jen jednou pak pokracuje nekonecna smycka loop
void setup()   {
 // nastavim piny na vystup:
 for (int pin = 0; pin < 8; pin++) {
   pinmode(radek[pin], output);
   pinmode(sloupec[pin], output);  
   //vynuluju vstupy aby nic nesvitilo
   digitalwrite(radek[pin], high);    
   digitalwrite(sloupec[pin], low);    
 }  
}

void loop()                    
{
   // postupne radky
for (int poradi_radek = 0; poradi_radek < 8; poradi_radek++)
{
 // p[ch345]ipojení spolecne katody na zem propustneho smeru
 digitalwrite(radek[poradi_radek], low);
 
 // postupne sloupce
 for (int sloup = 0; sloup < 8; sloup++)
     {
       //rozsvitim zhasnu diodu ve sloupci
       digitalwrite(sloupec[sloup], high);
       delay(svitit);
       digitalwrite(sloupec[sloup], low);
     }
 digitalwrite(radek[poradi_radek], high);      
}
}

where mistake in idea? why don't see 22 shing leds? why time 2 times longer number of shining leds?

thanks every idea..

quote

for example, shutter speed 1/45 s = 22 ms, [glow]time delay between leds 1ms[/glow], on photograph 11 shining leds.

you ignoring time takes looping, , 4 digital writes in pair of loops.

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