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25 dollars per SiPM, 3x3 mm
Could you please provide a quote for the price of the SiPM and scintillator? so that we can compare with other options. Also, you should NOT use the interrupt that way... each interrupt call takes at least 80 cycles, probably more: http://forum.arduino.cc/index.php?topic=157135.0Your maximum frequency will be CPU/80=200 Kcps (VERY optimistic!!). Use the T1 pin as external clock input for Timer1, so that you can read up to CPU/2.5= 6 Mcps.Also, even if you don't have so many cps, with your code many pulses will be "missed" during the processing of the previous one and the value you obtain may not be reliable (unless you are VERY below the maximum, so up to 1 Kcps is ok).Read here http://forum.arduino.cc/index.php?topic=166902.0
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