The AVR_ac library provides a simple interface to the Analog Comparator interrupt on an Arduino running with an ATmega328P and probably works on an ATmega168 as well -- they are extremely similar.
The code has been tested on projects created in the Arduino IDE version 1.8.13, and also in PlatformIO (platformio.org), with no problems on either system. However, the library as supplied is not in the correct format form PlatformIO projects---but you can extract all the source files from the src directory, and add those to your project.
To install the library:
- Click Sketch->Include Library->Add .ZIP Library;
- Navigate to where the zip file for this library is located on your system;
- Select it and click the OK button;
- Follow the prompts.
As of the time of typing, I have not built this library into a format suitable for uploading to the official PlatformIO Library Registry.
- Unzip the downloaded zip file.
- In your project's directory, create a new directory under
lib, namedAVRac. - Copy files from the
srcdirectory of the extracted zip file to thie new directory you created above. - That's it. You only need to
#includethe appropriate header file in your code, and the library will be used without requiring anylib_depssettings. Easy!
Norman Dunbar 27 October 2020.