What I will say as an aside that I find worth doing is what ever power connection method you use. to add a small toggle switch to the ground so you can, if you ever feel like it, turn off the leds without effecting the buttons ability to function. Not critical but it does make cutting the wire, stripping the ends and crimping the spade down easier and all in one tool. or 4.6mm I can't remember which off the top of my head but measure the width of a pin and it will tell you which one. It is not very difficult and you can do it without soldering, but you will need to buy some raw material to work with. some people salvage Cat5 wire. It can be useful particularly if you want to set up connection ports to plug and unplug equipment, but it is also delicate. Probably the thinnest wire you would want to work with. And if using Cat5 wire I would solder it to make sure it does not pull free.

power the leds independently. In this solution you are still creating a daisy chain wire harness for the LED pins but instead of connecting them to the +5v connector on the usb board you would be wiring them to a 5 volt power adapter that you plug in or something similar. You will create a chain for both pins of the JST connector (IE one for +5 volts and one for ground) replace your usb encoder with an led 3 pin encoder board. (1 pin is button action +, 1 is +5v for led and 1 is ground) Those connectors have a mini daisy connecting the ground of the button and led to the same ground pin of the connector. add an on/off toggle switch to the ground daisy chain and you can control the lights independent of everything else.My Die Hard explosives have no red or blue wire just various shades of pink. "McClane move the dusty rose aside, crimp the bubble gum pink and then cut the blush pink wire." "NO!!! not the fuscia!!" BOOM... "Muha ha ha" IF you want to use the little rubber covers you will slide them over the wire before you put on the spade and then slide them over the spade after it is crimped) I always forget and thus hate this part. I hate it so very much These are the three main solutions and they all have an unspoken given of all leds lights are just on. No fancy programming based on action buttons for game selected or LED activating only when button pressed. I am also leaving off the solar power, potato power, or pedal power possibilities. All applicable customs and import duties and any other charges are the responsibility of the customer.

From time to time carriers may deliver earlier or later, or on non working days however this is cannot be guaranteed nor should it be expected. Be sure to test which pin on the USB board is ground and which is the 5volt so you get it correct on the LED pins.Build a daisy chained wire harness to connect to the +5v connector on your existing board. This will power the led portion of the buttons (which by the way are the other two pins on the image you included). You will need to determine which pin on the connector is power and which ground. You can create a daisy chain harness with spade connectors that will slip onto the led pins like the button spade in your image do. Delivery timescales are based on working days; Public Holidays, Saturday's and Sunday's are NOT classed as working days.

Delivery timescales are esimates in working days; Public Holidays, Saturday's and Sunday's are NOT classed as working days. Lastly you will connect the loose end of each chaig to one of the wires of the JST connector so they can connect to the USB board. Whether you solder or rig on another spade connection with a male and female spade is up to your skill level. Crimp down the edges so both wires are held down by the spade end. (You can solder this for a stronger connection but not required IF you crimp it well enough) But wait there's more!...huh?...oh. I'm being told there isn't more. That is all they do. Cut, Strip or Crimp"

you may have power draw issues that slow down the Pi if you power a lot of leds. I didn't really notice an issue in a build I did with 10 led buttons on each players, but to be safe i brought in a powered usb hub to ensure the Pi was not impacted.