Need Help Wiring Joystick

**2k1Toaster** · 08-16-2009, 02:14 PM

Doesnt matter what voltage the potentiometers are based around, they all have inherent error. And I was saying the signal lines will fluctuate with noise. They will be sampled in an A2D converter and sent digitally over USB connection with a hopefully stable 0v/5v 0/1 pattern and when demodulated you will still get that noisy signal out of it.

**Curiosity** · 08-16-2009, 04:09 PM

The A2D is much better in a PIC from my experence, and I usually sample 8 or 16 times and avarage before sending the result so it's rock solid. The gamepad is hard wired for whatever it's intended purpose and less than half the 8-bit register is usable due to the fact that it auto calibrates the start voltage as center stick, so then you have only 2.5V to work with. So first thing to do is set up resistors for 2.5 open and still have differences in every button close. PITA.

Oh, Flaring_Afro.. The diode is to protect the gamepad. Your SWC has 12V running through it which would fry the gamepad and possibly more without it. What god of cpu did was run the 5V backwards through it.

**sergatiuk** · 08-16-2009, 04:16 PM

its interesting where this is going ... however i dont see the need for the diod, nor resistors... all i did to make mine work is extend the thumbstick away from the controller board, bind the axis ends to keys and whalla ... works fantasticly... never fried, never failed...had it for over a year...

**2k1Toaster** · 08-16-2009, 04:28 PM

Originally Posted by sergatiuk

its interesting where this is going ... however i dont see the need for the diod, nor resistors... all i did to make mine work is extend the thumbstick away from the controller board, bind the axis ends to keys and whalla ... works fantasticly... never fried, never failed...had it for over a year...

Then you are extremely lucky and the buttons are already divided to 0v-5v. On a lot of systems, that second divider resistor is located in the HU itself. So the 1 wire contains 12v to 13.8v (or 14.4v on some charging systems) with varying resistance. You connect that to a 5v gamepad and things may melt.

**sergatiuk** · 08-16-2009, 04:35 PM

may-b i misunderstood the thread then .. lol
however, if the gamepad is used to control the software on the PC then it should just be plugged in the USB... after all the Xbox controller is USB...