Filtering noise from a wire

[Demon]

what is the shortest switch activation period that you would expect to need to detect and how quickly do you need to respond ?
generally any key press under 50mS i would just ignore . for basically "static" switches 200 0r 300 mS would be more than adequate
...

I didn't have real world data yet. Here's the switch with the longest activation period mounted on a test PCB:

(similar to this switch, yellow circuit, about 10cm end to end)




5vdc with 10:1 probe
.1 volt / division
.2 ms / division




It takes 5 divisions for a press, so 1 millisecond end to end. The other switches take about 0.3 to 0.6 ms.

It has a blurry bounce of under 2 sub-divisions at the top (∼0.07ms), I saw at least one other press with a bounce twice as long (it was out of focus - I didn't save it).

I wasn't able to get any rising edges for some reason. I'm sure that has to do with the trigger settings, but I just don't know how to do that, yet.


This is what I get probed directly to an identical unconnected switch:




It took a lot less time to activate, under 0.5ms. I assume this is what you guys meant about traces acting as antennas.