SNES LR

[Robots86]

I want to use the left and right triggers from a snes controller on my build. My plan is to wire up the trigger boards to teensy and ground to the button pcb.
May be a stupid question but how do i tell which solder point on the trigger board is ground and which is the button?

[Oxodao]

Multimeter. If you talks about the snes board, just put it in continuity and check the traces. If they links on multiple buttons, that's probably ground.
If you talks about the DMG01, they are all separated, just choose one.
And lastly if you talks about DMG Common ground PCB, just follow the traces from the GND pinout, or check with continuity

And if you talks about the button, it just let voltage flows through it when it's pushed, there is no gnd / button, you can just set one side as the ground and the other as the teensy input/output

[Robots86]

Multimeter. If you talks about the snes board, just put it in continuity and check the traces. If they links on multiple buttons, that's probably ground.
If you talks about the DMG01, they are all separated, just choose one.
And lastly if you talks about DMG Common ground PCB, just follow the traces from the GND pinout, or check with continuity

And if you talks about the button, it just let voltage flows through it when it's pushed, there is no gnd / button, you can just set one side as the ground and the other as the teensy input/output

Thanks for the reply it all makes sence now

[myunholysins]

Also if it helps in this video he uses the L, and R buttons and shows you were to solder them at. https://www.youtube.com/watch?v=f_zp42fQ-dQ

[myunholysins]

nvm im sorry i thought he did it in the video but heres the link with the photos of it. https://learn.adafruit.com/super-game-pi/wiring-buttons

Also for ground i would daisy chain them together the two grounds so you only use one ground spot. and in teensy it would just be numbers 10 and 11

[Robots86]

nvm im sorry i thought he did it in the video but heres the link with the photos of it. https://learn.adafruit.com/super-game-pi/wiring-buttons

Also for ground i would daisy chain them together the two grounds so you only use one ground spot. and in teensy it would just be numbers 10 and 11

So i join the ground of l and r and then solder one to the teensy ground?

[myunholysins]

yes exactly.