It's my first time designing a circuit and I want to make sure the pcb matches the schematics. I know I can check this on the software itself but there are too many components that it's too confusing to check. I apologize if this does not fit for the forums.
This is the rc circuit that I want to replicate for the three buttons.
Yeah, I can see that! 
You have a microcontroller. There is absolutely no need to use a "hardware" debouncing circuit. 
I believe you have an RGB LED. It requires current limiting resistors for each colour.
That is not a PCB (meaning: Printed Circuit Board) diagram.
oops, I forgot about the resistors. Thanks!
I just want to try putting hardware debounce because it is the first time I am making a circuit.
But you have a microcontroller/ microprocessor. Hardware debounce is a total waste of time.
(There's a pun in there. )
A Schmitt trigger is required (not just any 'inverter').
Debouncing fun with Schmitt triggers and capacitors - Machina Speculatrix (mansfield-devine.com)
Yes. The nice thing is that the i/o pins configured as INPUT on the Arduino have Schmitt triggers.
At least the ATmega328.
a7
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