Paul Stoffregen has contributed the FreqCount and the FreqMeasure libraries to the Arduino IDE. FreqCount is the preferred library for measuring frequencies in the 1 KHz to 8 megahertz range. For more information see: <https://www.pjrc.com/teensy/td_libs_FreqCount.html>
FreqMeasure is the preferred library for measuring frequencies in the 0.1 Hz to 1 KHz range. For more information see: <https://www.pjrc.com/teensy/td_libs_FreqMeasure.html>
Please consult the web pages listed above to determine which digital input pin to use with your Arduino board or Arduino clone. Because FreqCount and FreqMeasure use different digital input pins double check your wiring to make sure you are using the correct digital input pin.
You must use Arduino's "Manage Libraries" tool to use these libraries. The Manage Libraries tool was added to the Arduino IDE starting with version 1.6.2. The procedure for installing the FreqCount library is:
Open the Arduino IDE
Click on the menu item "Sketch"
Select "Include Library"
Click on "Manage Libraries"
At top of page in the box with the default value "All" select "Contributed"
At top of page in the box with the default value "Filter Your search" enter Freq
Click in the FreqCount box
In the lower right corner of the FreqCount box click on "Install"
If you see "Installed" next to the FreqCount title then you have successfully installed the FreqCount library.
Replace FreqCount with FreqMeasure in the above procedure to install the FreqMeasure library.
For more information about Arduino's Manage Libraries tool see"
<https://www.arduino.cc/en/Guide/Libraries>
To test the FreqCount library:
Click on the menu item "File"
Select Examples
Scroll down to the bottom of the list, select FreqCount and click on "Serial Output".
Connect your frequency signal to be measured to the appropriate digital input pin, run the example , and then open Ardjuino's Serial Monitor to inspect the results.
To test the FreqMeassure library replace FreqCount in the above procedure with FreqMeasure.
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