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xischaune said:Hi
The one which i like is the zero-crossings method...
Just implement a zero-crossing comparator with a 1 second counter... and you have the frequency..
Borber said:What is frequency of a signal? It is number of periods in a second.
Count periods in a specific time and calculate frequency.
Period of a signal is inverselly proportional to it's frequency. Measure duration of a period and calculate frequency.
What previously posters said is dealing with signal conditioning before measurement and is not a method of frequency measurement.