Need help with capacitive button cover for Xbox One. Answered
So I hate capacative buttons. I work for Microsoft as a game dev and we all have Xbox Ones. They have the worlds most sensitive capacative power button. We regularly accidentally turn our boxes off with a slight brush of the hand, bumping a coffee cup that was too close or brushing a controller cord against it.
I have been trying to build a button cover. One that will still turn it on and off with an actual press rather than a light glance of the hand. I have had no luck so far and have been learning about conductive surfaces along the way.
The original plan was to use conductive rubber and some scotch double sided tape. The tape I am using is a clear rubber and has a mm or so of thickness to it. I bought some gasket punches and punched out a button about the size of the capacitive area of the Xbox One power button, around an inch, and then another in the tape. I punched out a smaller center hole in the tape to turn it into a washer, and stuck it onto the button and stuck it on the Xbox. In theory you have to press the button in to make contact with the capacative button to turn on or off the Xbox. But alas, it still turned on with the slightest of brush still. I stacked the tape up to four times. I tried foam mounting tape. Alternated tapes, stuck electrical tape inbetween, and still the same thing.
On their own the tapes wouldn't turn on the button when tapping them to, but perhaps there was enough distance when touching holding it length-wise rather than flat against.
I figure the electricity must be flowing over the non conductive surface and still going to the button. In the office with all the EMF I seem to be averaging around 3v to the touch. I have a grounding mat at my desk that when I make contact with takes me under a volt, to around 0.3v but that doesn't make a difference.
So I figured I needed a bigger insulator. I got some larger machine washers where the hole seemed larger than the capacative area, punched another larger button out of the conductive rubber and glued it over the hole. Using double sided scotch tape I stuck it to the Xbox. The same thing as before happened. Even touching the rubber only was enough to turn it on with a light bump.
I figured I needed a ground. I tried removing the grounding cord from my mat and holding it against the rubber of the button. It seems slightly less responsive but still turned on easily. I tried running copper tape along the side of the Xbox to the button to see if that would draw away the charge, but it did not.
Taking my rubber washers I used my multimeter to see if they were conductive at all. They did not seem to be. Setting it to measure the volts in ac they are picking up about 0.03v, but so is just the air. But the rubber rings will turn on the Xbox when I hold them though the thick double sided tape will not.
Does anybody have any ideas on how to get this to work or what I am doing wrong? I will admit I don't know a ton about this stuff. But I don't understand how these materials can turn the button on.