[jwax]

The pulses are coming from a LM555 timer working in Monostable mode to generate the uniform pulses. They look very clean on an oscilloscope.
Would the Arduino “prefer” the negative pulse, and give better stability?
I’ll be trying that next, along with making the trigger pulses even shorter, maybe < 1 msec.
Appreciate your help, Michael!
John

[jwax]

Pin 8, the input pin, has a 56 Kohm resistor to ground. Perhaps this should be smaller?

The trigger circuitry was configured to produce the +5 volt pulse. If need be, I could invert it, and rewrite the code as you suggest.

Thanks Michael!

[Author]

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