Pedal Pi Push Button Switches

Hi, yes the push-buttons are normally open.
When you push it, it gets closed.

Here is the link for the part:
uk.farnell.com/multicomp/r13-24a-05-bb/s...5v-solder/dp/1634687

You can also use the opposite style, but you would need to change the software.

ops! that is a typo, they are 300 ohms (100 or 200 would work too).
good schematic here: www.electrosmash.com/media/kunena/attach...dal-pi-schematic.pdf

They create a low pass filter for the power supply that cuts the high frequency harmonics created by the Raspberry Pi Zero switch mode power supply (all over 2Hz will be attenuated).

I will fix the schematic right now, thanks for spotting it.