Re: USB Joystick hack, wire lengths, false triggers...

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: Maybe I should have made it clear, that I would like to use 8 buttons...all of column x1 and x2. : But the problems I am experiencing with just row prevent me from detecting whether it was button #1 or #5 that was pushed. : With only 4 buttons wired (5,6,7,8) then I only check for presses on 5,6,7,8 and can safely ignore 1,2,3,4. : -rjf : ---- : : This is not a MAME question, but hopefully someone can help... : : I have an USB Gravis Gamepad that I have torn apart and wired up my own buttons. I use these buttons for a quiz-show style game. Each contestant has a button who chimes in when they know the answer. (Addtl info: it's a Visual Basic PC app that checks for the button press). : : Because of the problems am I having, I am only able to use buttons 5,6,7, and 8. : : I have a (Radio Shack) button on 5 feet of 20 gauge speaker wire connected to the Gamepad circuit board. With this set up, a button push on button #5 also triggers #1; button #6, triggers #2; button #7, triggers #3; button #8, triggers #4. : : If two buttons (any two of 5,6,7, or 8) are pushed--then ONLY those two buttons are triggered (the corresponding 1,2,3,4 button cancels). : : The buttons are arranged on the encoder chip in a 4x3 matrix: : : <pre> : : x1 x2 x3 : : y1 1 5 9 : : y2 2 6 10 : : y3 3 7 na : : y4 4 8 na : : </pre> : : Again, I only have column x2 wired, but a single button press on that row triggers a button in col x1 (unless two or more buttons from x2 are pressed). : : Any ideas?

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