program behaving wierdly, help me please!

hi all, sorry this, sure must simple problem brain cant solve it.

i have flashing light, want flash per minute of.

i using spark fun light sensor, seems respond pretty well, did simple program consisting of:
serial.println(analogread(pinbpminput));

and serial data showed clear difference between when light off , when on. when on got reading of 24 , when off reading low 3.

the code have posted below supposed serial print 1, first time light flashes, , continue counting until light has flashed 4 times , reset one.

so serial data should be:
1
2
3
4
1
2
3
4

if light has flashed 8 times example.

but!!! problem, serial data putting out above example 1 flash of light, puts out few numbers every time flashes rather 1 number @ time.

what doing wrong? bugging me, because cant see how wrong!

code: [select]

int pinbpminput = 0;
int count;
int bpm;
int tick = false;
int oldtick = false;

void setup() {
 serial.begin(9600);
 serial.println("online");
 delay(2000);
 count = 0;
 pinmode(pinbpminput,input);
}

void loop() {
 oldtick = tick;
 bpm = analogread(pinbpminput);
 if (bpm >10) tick = true;
   else tick = false;  
 if (tick&&(oldtick != tick)) {
   count = count++;
   if (count > 4){
     count =1;
   }
  serial.println(count);
 }
}


thanks everyone!

you need "debounce" readings buttons. try adding short delay after code has bumped 'count'.

oh, and

code: [select]

count++;

is enough code increment variable.

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