Adding L2/R2 buttons to Freeplay Zero
I apologise if this question has been asked before, but do any of the add-on boards for the Freeplay CM3 fit the Zero as well?
 I'm planning to pick up a Zero to play PS1 and older systems, and having L2/R2 would help, but the add-on boards available don't explicitly state that they'll work with the zero, and it's hard to tell just from comparing pictures if any of the board components would get in the way, or if there's anything the CM3 has that the Zero does not that the boards need to function.
 Anything y'all can tell me would be a huge help!
Hey SuperGilfer!

The Freeplay Zero doesn't have extra GPIO pins necessary for the L2/R2 addon. The addon board also has solder spots that only match up with the Freeplay CM3 circuit board. The Freeplay Zero was never meant for expansion, since the pins are all used up already.

Having said that, there are 2 pins that you could try using, if you wanted to. They are pins 27 and 28 on the Pi Zero's pin header. We don't touch these, as they are typically used for Pi hat identification, but we do not ID our board using that method. I believe that there may be a way that you can put them in a GPIO mode and then could use them as button inputs by editing the /etc/modprobe.d/mk_arcade_joystick.conf file.

Check at (and the note of "GPIO 0 and 1 are reserved - Do Not Connect")
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