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Hacked gamepad randomly activates buttons - ghosts?
harveybirdman:
If you get too frustrated trying to troubleshoot, I've had great luck with Viggo's ZD encoder. Price is very nice too!
benarcade:
I've PMed Vigo - I guess he's not around.
The random keys fire off even when I'm not touching it - so no movement is necessary for it to randomly fire. Doesn't sound like a short - I'll double check it anyway. I don't remember how old it is - probably older than I think - at least 6 yrs old. I had it laying around, and I wanted to get the joystick rolling asap, so I used what I had handy. It could just be get off my lawn senile.
RandyT:
--- Quote from: BobA on February 25, 2013, 04:48:11 pm ---Check your gamepad for shorts or bad solder joints. If it worked before it should still work or it may have died while you were hacking it. Random key presses of the buttons when just the joy is tied in is not the action of even a cheap controller.
--- End quote ---
This may be true of a cheap controller when it is in the state it was originally designed for, but not necessarily true once longer lengths of wire are attached to it. It may be a workmanship issue, but it may also just be that the way the PCB is designed, it cannot handle stray RF or EM emissions from other equipment when wiring starts to act like antennae. This has even been seen with encoders which are sold for quite a bit more. Matrixed encoders are usually used on inexpensive devices, as this gets around the limited number of pins on inexpensive microcontrollers. This arrangement is especially sensitive to external interference, as a disruption on any part of the matrix while it is scanning, can cause these phantom activations.
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