but to activate a second timer-based ISR at that time that runs at a certain interval which timestamps any button press and checks the amount of time the button has been active. If it’s under a ...

I made this Arduino 8 bit binary led counter as a solution ... we debounce the button and increase the value of presses each time we press the button (when we trigger the interrupt from the setup()).

To prevent data corruption when using multiple SPI devices on the same bus, care must be taken to ensure that they are only accessed from within the main loop, or from the interrupt routine ...