The PushButton library supports connecting a momentary pushbutton, either normally-open (NO) or normally-closed (NC), to an Arduino GPIO pin. It uses a OneShot object to provide debouncing logic to filter out either intermittent connections when opening or closing the pushbutton's contacts, and if desired to screen out button pushes which occur too close together.
The repository includes a PushButton_test sketch in the examples directory. The sketch defines a PushButton object connected to GPIO pin 7 with a 500 millisecond timeout period. As written, the sketch expects a normally-open momentary pushbutton to be connected between pin 7 and ground. Each time the button is pressed, "ping" will be written to the Arduino IDE's serial console. If the button is pressed twice within a half-second, the second press will be filtered out.
The PushButton_test sketch requires the OneShot library (https://github.com/twrackers/OneShot-library) and the StateMachine library (https://github.com/twrackers/StateMachine-library), in addition to the PushButton library.
The PushButton library depends on the installation of the OneShot library (https://github.com/twrackers/OneShot-library) and the StateMachine library (https://github.com/twrackers/StateMachine-library).
Instructions for installing the PushButton library can be found in file INSTALL.md in this repository at https://github.com/twrackers/PushButton-library/blob/main/INSTALL.md.