Simple Frequency Counter Using #Arduino

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In this tutorial we will learn how to make a simple Frequency Counter using Arduino.

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can this be used to adjust a ham radio? will it measure the radio's frequency? can be connected to a radio in the first place?

hippohoppa
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what should be the minimum voltage of the signal whose frequency is to measure. I want to read Microvolt signal frequency, is it possible with arduino?

minahilashraf