Problem with working of fan when door sensor is closed

hi,
  working on project in fan must turn on when door sensor closed first time , fan should off when door sensor opened.when door sensor closed second time,bulb must on ,  when door opened again bulb must off.initially door should open.
here code have written.

code: [select]


int bulb=9;
int fan=5;
int door=12;
int state;
int dstate;        //store state of door
int count = 0;    //counter number of times door sensor opened or closed
int previous = 1;


void setup() {
  pinmode(bulb,output);
  pinmode(door,input);
  pinmode(fan,output);
  serial.begin(9600);
}


void loop()
{
     dstate=digitalread(door);
     if(dstate!=previous)
      {
        count++;
        serial.println("count=");
        serial.println(count);
        if(dstate==low)
        {
          
         if(count==3)
         {
            digitalwrite(fan,low);
         }
         if(count==5)
         {
            digitalwrite(bulb,low);
         }
        }
      
         if(dstate==high)
         {
          if(count==2)
          {
            digitalwrite(fan,high);
          }
          if(count==4)
          {
            digitalwrite(bulb,high);
          }
         }
       previous=dstate;
      }
}


i have used state change detection concept.but not seem work.the fan turns on 2 or 3 seconds , automatically turns off without changing door state.

i new arduino ,  i've tried few things i'm still stuck.

any appreciated,

thanks.

what debug prints tell you?

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