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Thanks for the response, i'll respond some code soon. but i think Kurte might have solved my problem.

Hi all
Ive tried counting two pulses at once using interupts. if i count one pulse it works very well. at a second pulse there are both nothing close.. Ive tried both
with a teensy 3.5 and 3.6. ...

What if i use like 3.4V would that do any damage?

Can the pin's on a Teensy 3.6 handle 5VDC?

I'm trying to count interupt's and I noticed it counts spot on at 5V but drops pulses when on 3.3V

Edit - i found it out it cant. but any idea why...

I think i will try to find a way of leaving out the opto's and solving the interference issue between multiple teensys

5MHz+ I was thinking that was the bottleneck. I need them because if I have three teensy connected VIA serial sharing a common supply they effect each other if they aren't isolated.
So i put an Opto...

Hi All

I'm trying to build a counter which counts pulses from a energy meter, I would like to count as fast as possible.
I have tried a 3.5 and 3.6 found not much difference between the two. I...

I've had some good success counting pulses using interupts on the 3.5 and 3.6. Method I'm using is gateing the 3.3V output. I'm counting the pulses of an precision energy meter, used for the...