Counting rain with tipping bucket

hi

i got cheap tipping bucket rain gauge off ebay. when bucket tips, 2 attached wires connects around half second. i'd count event.
browsing around got me interested in interrupt function can't quite working. recon uno uses pin2 interrupt 0 , experimented both 3.3v, 5v , gnd other 1 - rising/falling.

i use code:

code: [select]

int x = 0; 

void setup() {               
  attachinterrupt(0, increment, rising);
  serial.begin(9600); 
}

void loop() {
  delay(3000);
  serial.println(x, dec);
}

void increment() {
    x++;
}


running types me zero. other times gives me example 151, 300, 450 etc. counting? 50 hz 3 seconds? sounds grid ac in house.
if tip bucket, counting stops in middle position, other times nothing happens.
how can make 1 tip (perhaps 500ms connection) count +1? plan on making rain guage count millimeters of water.
 
thanks in advance,
chris

well, browsed wrong places. interrupt not way handle such slow event. problem switch not de-bounced. have whether done interrupt or not.

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