Making DIY game controller - Arduino gamepad TUTORIAL - YouTube
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JoyStick Dual Axis Module PS2 Game Control Game Controller for Arduino Pi, 1,49 €
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Simple Joystick Control With Leds - Hackster.io
I made a gaming control panel using an Arduino Leonardo to play simulators. Currently using it for DCS World, but it should work in most games just like any joystick / gamepad.
Tutorials On Arduino And Joystick Interface - Makerguides.com