LED/Photocell

how led stay lit when photocell actuated- when actuated again, led turn off?

here code have- led turns off after removing finger off of photocell.

code: [select]

int ldr = 0;

//analog pin ldr connected, here set 0 means a0

int ldrvalue = 0;

//that's variable store ldr values

int light_sensitivity = 570;


//this approx value of light surrounding ldr
void setup()
 {
   {
   serial.begin(9600);            //start serial monitor 9600 buad
   pinmode(13, output);           //we use13 because there built in yellow led in arduino shows output when 13 pin enabled

 delay(3000);
 }
}

void loop()
 {
   ldrvalue = analogread(ldr);

   serial.println(ldrvalue);

//prints ldr values serial monitor                   //this speed ldr sends value arduino
 
 
     
if (ldrvalue < light_sensitivity)
    {
      digitalwrite(13, high);
    }
    else
    {
      digitalwrite(13, low);

    }

     
 }

read how use forum sticky, go , modify post code posted correctly.

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