I have a wave I want to feed into an Arduino to measure frequency.
I need the wave to hit zero to measure the frequency, I think. A nice clean square wave ideally.
I am using a simple 4.3V Zener voltage limiting circuit to cap the wave to 5V but need it to hit zero also.
I'm not worried so much about amplitude, just frequency. The frequency range is from 0-8000Hz. Can anyone suggest a way to do this?
The wave form looks like this:
0V is at the base of the plot, maximum voltage on this snapshot is 4.73V.