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Discussion in 'Tutorial Area - By users for users!' started by nofutur, Jul 20, 2016.
Nice home etched board!
What solution did you use for the slider though?
I used fully everything from here, but with my very little modifications/improvements (if someone can call it so)
I was afraid about that 2+2mm plexiglass + picture between them will make use of slider very hard, but in result slider sense fingers in distance 1-1.5cm from slider, from top plexiglass part. And that is makes sometimes use of slider difficult due to false positives. I saw in Psoc Creator IDE settings of capacities of fingers for actuation contacts. If I change that settings to some less or more value, will it somehow help with those distant actuation of slider? And what setting I need - less or more? At first glance it seems that it needs "more".
But I see in manual something like "supports parasitic capacitance" (is that what I mean above?) And when value of finger capacitance is less - then parasitic capacitance is less too. Is that means that less value can solve problem?
More is the right way. Larger value lets the sensor look for higher capacitance change, or in other words decreases the sensitivity of the sensor, thus helps on eliminating false positives. FYI LKP has this set to 0.7 (!) but YMMV.
Thanks for the hint!
But may be I'll try to change settings after I'll receive PCBs for slider, that I made based on PCB from this post https://projectdiva.net/community/threads/project-diva-homemade-controllers.1465/page-6#post-16586
but, as this base board. and my board do not have ground hatch and this will somehow increase parasitic capacitance.
So I improved little board and made ground hatch in front and in back side, somehow as Cypress CapSence (https://www.cypress.com/file/41076/download) manual says, but only KiCad cannot make a 7 mil line, 10 is minimum and in some places it makes solid fill, so I do not know, will it make better then? :)))
Is it OK on your opinion?
But I'll look, what I'll receive with first variant and make decision, will I make second variant with ground hatch or not? :)
And by the way. I also received PCBs from plant in China (design - mine, trade marks - stolen :)))) ) and it's amazing, because soldering on such a board is a pleasure and everything turns out very carefully. I think in future I need to use solder mask on my home-made PCBs too, because it's really making much careful.
You can. Change the design rule to allow trace width < 10 mil. Most prototyping PCB manufacturer should do traces down to 5mil just fine, but be sure to check their capabilities to make sure.
I would recommend keeping the ground hatch because the design doc says so. I didn't actually try to do solid fill but just by intuition it's probably a bad idea. Also for big sensors like this using active shielding might help on reducing parasitic capacitance as well. However SEGA didn't use active shielding nor ground plane (?) on the real thing so it probably won't affect much tbh (but they also uses 2 chips).