Question GC+ Need help getting boards to work

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While waiting for the store to restock GC+ I decided to build a few. I have tested everything with a multimeter and didn't find any shorts. (I know in the 2nd image, 2 of the vias on the left look connected but according to my multimeter they are fine, maybe just the solder mask is messed up)

And it looks like I flashed the chip correctly.

I wired enough just to test the A button.

When I plug this into the GameCube adapter for the Switch (playing Smash Bros Ultimate) and connect A to GND, there is no input.

I have not had any luck on the 3 other I tested as well.
 
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I am using a 3rd party Gamecube extension cable where red is data (top center) to D on GC+, green is 3.3V (bottom left) to +, and yellow is GND (bottom right) tp -.
 

Stitches

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How long is that unshielded data wire? Also, pls clean the back of that board. It's grubby as fuck and upsets me.
 
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The total length of the cable is about 3 feet. The line connecting D to the extension cable is about 3 inches.
 

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That length should be fine. Can you show us photos of the rest of your wiring?
 

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I'm assuming you continuity checked all those since you went to the trouble of making a JST connector for it. The only thing I can really suggest is to wire up two thumbsticks to it (because GC+ don't like not having sticks connected and can fail randomly) and see if that makes a difference.
 
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No luck with the thumb-sticks wired. I guess I'm going back to using 4 Arduinos to simulate a controller.
 

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No luck with the thumb-sticks wired. I guess I'm going back to using 4 Arduinos to simulate a controller.
Have you tried wiring the GC+ directly to the controller data pin on the Wii itself? Maybe your extension cable is messing with it.
 

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While waiting for the store to restock GC+ I decided to build a few. I have tested everything with a multimeter and didn't find any shorts. (I know in the 2nd image, 2 of the vias on the left look connected but according to my multimeter they are fine, maybe just the solder mask is messed up)

And it looks like I flashed the chip correctly.

I wired enough just to test the A button.

When I plug this into the GameCube adapter for the Switch (playing Smash Bros Ultimate) and connect A to GND, there is no input.

I have not had any luck on the 3 other I tested as well.
gc+ will only work with 4-layer wii, if you want it to work with a 6-layer wii, you need to add a 10k resistor between data and 3.3v,i do not know the ns adaptor have the 10k resistor inside or not.
 
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