The blueNES 2 is a follow-up to the blueNES. Instead of using an Arduino, the blueNES 2 uses Adafruit’s Bluefruit. When connected to ground pins 0 – 11 on the Bluefruit will send a keyboard command. I’ve connected mine to an old NES controller. It’s that simple. The controller pinout I found on this Instructables.
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