Wednesday, 1 April 2009
Common ground Mod with analog switch
This common ground mod are uses in arcade stick building for several reasons:
- keep the wiring easy (daisy chain for ground)
- dual PCB mod
- using the standard 5 pin connectors for sticks like sanwa jlf and seimitsu LS32-02
- connecting vintage joysticks like competition pro for sensible soccer ;)
This is just another approach comparing to the optocoppler approach. Optocoppler a little bit more expensive. Therefore wiring is here mor complex and more parts are used.
Joystick in general have the states disconnected (undefined) and active low. To define a active high for the inverter pull-up resistors (R1 - R4) are used when stick is disconnected.
When joystick is moved to one direction signal is active low. Inverter changes it to active high. Active High is needed because 4066 switches only on Active High. The output pins are enabled and activate corresponding button on the xbox360 gamepad.