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Embedded Forum how to increase sensitivity of FRDM KL25Z Touch Sensing to accommodate a glass

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how to increase sensitivity of FRDM KL25Z Touch Sensing to accommodate a glass

vinod_ganesh over 12 years ago

HI ,

I would like to use a 2mm thick glass to be placed over the touch sensor and test the TSI interface.

I am not able to read through the glass.

What are the steps that needs to be followed to make the TSI respond with a glass overlay

regards

Vinod

0 vsluiter over 12 years ago

Hello Vinod,
I'd try to lower the THRESHOLD values in TSI.cpp:
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0 vinod_ganesh over 12 years ago in reply to vsluiter

This was the first thing i tried and did not work well. i have a 2mm glass and reducing the thershold does not seem to work
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0 vsluiter over 12 years ago in reply to vinod_ganesh

Then I'm afraid I'm not the one who can answer your question...
The KL25 reference manual is very elaborate, so you might find something there that might be able to improve performance.

Good luck, and keep us posted if you find something!
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0 Former Member over 12 years ago

Hi Vinold,
The following links might be useful for you and anyone else trying to do this:
AN3863, Designing Touch Sensing Electrodes
Touching the Freedom Board
Xtrinsic Touch Sensing Software (TSS)

Hopefully that might help!

-Anthony
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