Readng input pin signal - frequency - hertz ?

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hi,

first post here , still beginner these arduinos.

having done quite lot of searching have not found out how read how fast, frequent signal arriving @ input pin.
the board mega , signal 5 volt , coming ethanol sensor, understand send square ish signal , reading signal high project one.
regards
rob

welcome,

can tell more signal e.g. range of frequency datasheet etc.

if go through tutorial section find lots of usable snippets.

if want jump deep there site:
- http://interface.khm.de/index.php/lab/experiments/arduino-frequency-counter-library/ -


Arduino Forum > Using Arduino > Project Guidance > Readng input pin signal - frequency - hertz ?


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