Software Vs Hardware Debounce. To debounce the mechanical contacts in hardware you can do a few things. Arduino or Raspberry Pi then you have the option to debounce in software and save the cost of the extra capacitor.
In software debouncing the trade off is the microcontroller requires a few more cycles which can slow the execution of the program slightly and the variables needed for software debouncing requires a bit of memory. Arduino Software and Hardware Based Button Debouncing This button debouncing is vital for using any type of button with the Arduino. There are different ways to debounce in hardware - some involve discharging a cap to Gnd when an exernal button is pressed with a.
Arduino or Raspberry Pi then you have the option to debounce in software and save the cost of the extra capacitor.
The figure below is a simple debouncing circuit which is often used. You can make or buy a latching circuit commonly called a debouncing circuit or you can take care of the debounce in software. The figure below is a simple debouncing circuit which is often used. Hardware is what makes a computer work.