Take any of those projects where the source is given up for a micro platform,
after the sample period, at the time of printing to the display, also send the value to a hardware serial port.
If the value is higher than a byte, fill a buffer and empty a byte at a time, and rewrite the buffer for every cycle it’s emptied.
That kind of serial frequency counter would be as accurate as any other for the period measured,
but if you were watching a frequency that changed fast, that chip can’t track it with much speed. It would be a horrible spectrum analyser![]()
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