๐Ÿ“ฃ๐Ÿ“ช ๐Ÿšš Adafruit will not be shipping USPS orders Monday October 14, 2019 ๐Ÿ—“. Expedited USPS orders placed after 11am ET ๐Ÿ•š Friday October 11 will go out Tuesday October 15 ๐Ÿ“ฃ๐Ÿ“ช๐Ÿšš
0

Custom Capacitive Touch Grid
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Custom Capacitive Touch Grid

by justinctanner on Tue Aug 13, 2019 2:50 pm

Hey all,

Im working on a project with a MPR121 12channel Capacative touch shield.

However, I am using large areas for the project touch pads, and the sensitivity goes way down and I run into issues where it doesnt detect a touch/release and messes up the whole project.

I could mess with the thresholds, but that hasnt proved fruitful.

I'd rather limit my functional surface area by getting a custom copper grid pcb made but cant seem to find a reasonably easy way to do so.

Basically, I want a grid like the attached photo. Dense near the user, less dense farther out, but still dense enough that most touches would register, with a bit of area to clip onto or solder onto.

Any ideas on how to make something like this or get it made?
Attachments
CopperGridPattern-01.png
CopperGridPattern-01.png (468.86 KiB) Viewed 49 times

justinctanner
 
Posts: 6
Joined: Fri Oct 19, 2018 7:29 pm

Re: Custom Capacitive Touch Grid

by adafruit_support_mike on Tue Aug 13, 2019 10:11 pm

You can design a PCB with traces in that shape using Eagle, KiCad, or any of the proprietary board design packages.

Places like Seeed Studios do custom PCB fabrication for small batches:

https://www.seeedstudio.com/fusion_pcb.html

adafruit_support_mike
 
Posts: 59116
Joined: Thu Feb 11, 2010 2:51 pm

Please be positive and constructive with your questions and comments.