I was thinking of using arduino and PS2 keyboard to test jamma arcade board controls. I have now interfaced the keyboard to arduino and it is working fine. I can flash leds on i/o-pins with keyboard buttons.
My question is how would I go about emulating the button switches with the i/o-pins (without destroying the arcade motherboard)? The buttons in jamma interface work like following. When buttons switch is open the pin is high (5V) and when button is pressed it gets grounded. I'm a little confused how should I connect this. I just don't want to burn the motherboard when I get it. :)
Would it work if I just connect the button pins to arduino pins and configure the pins as input. Then when button press occurs pull the pin low (ground). They would have to be in same common ground of course but can I still power arduino board separaterly or should I power it also from the jamma interface. I'm going to use normal atx-psu for powering the board.