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I have a question about LEDs do I need switches with LEDs already installed or can i buy some LEDs off of Amazon or sparkfun and just solder of those on as well? If so does the size matter? Sparkfun's LEDs are 3mm and Amazon's are 5mm. Thanks for the help.
Check the discussion back log but I believe you have to buy 3mm flange-less LEDs, the switches have a hole ready to allow their installation and the PCB has the two holes to connect them in a matrix to the LED controller chip.