Geiger_Counter questions

I recently got the geiger counter twig, a nice and clean design from my initial item. I plugged it in and get random light blinks, but I am having some confusion with the example sketch.

cleaning up the obvious typos I don’t see how it can work, and my test were not consistent.

First it instructs one to plug it into slot 2 on the shield. Yet it attaches the interrupt to 0 which is not connected as I understand it, what am I missing?


I am wondering if you use this J408γ Geiger–Müller Tube. The Geiger Counter is used to detect the gamma rays and outputs a pulse, then this will be showed by a blink of the LED. It use the interrupt 0 function via this pin.
So please tell us more details and let me know if you still cannot solve it.