I've found a circuit board that has a couple of circuits (buttons, IR Receiver, LED, USB). The thing is that following the line for interfacing the buttons I came across what seems to be like buttons that are connected only to the ground line of the PCB while the other end is a free pin cable.
Is there a way for the arduino to detect the ground when the button is pressed or a way to detect a short of some kind? There is a smd and a resistor on both buttons.
Main Ground-----Button-----SMD Capacitor-----Resistor(101)-----Free Pin
Thanks in advance!
Edit: Circuit Board