• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 79 subscribers
  • Views 227 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR2633: Capacitive touch sensitivity

Tejas N
Prodigy 30 points
Part Number: MSP430FR2633


Tool/software:

We are building a product called Smart Lock where multiple modules like touch, NFC, finger print, and much more are present.

We have built the custom touch control board using MSP430FR2633IRHBR.

If we place our finger on the PCB PADs, we are able to detect. We have added the transparent acrilyic sheet to the PCB, and we are able to sense it. but if we add the actual panel, which has the black coating, we are unable to detect the touch sensitivity.

Can anyone suggest if there is any way to increase the sensitivity?

Attached the product panel & PCB

Custom PCB

our product panel

  • 0
    TI__Guru 71216 points

    Hello Tejas,

    Does the black panel contain any conductive paint or coatings?

  • 0 in reply to Dennis Lehman
    Prodigy 30 points

    its just coating

  • 0 in reply to Tejas N
    TI__Guru 71216 points

    Hi Tejas,

    Tejas N said:
    If we place our finger on the PCB PADs, we are able to detect. We have added the transparent acrilyic sheet to the PCB, and we are able to sense it.

    When you tested this with the acrylic sheet, did you simply lay the sheet on top of the keypad, or use some type of adhesive so that the sheet was in direct contact with the pads?  This is good because it minimizes any air gap between the acrylic and the pads (sensors).

    Tejas N said:
    but if we add the actual panel, which has the black coating, we are unable to detect the touch sensitivity

    And when you placed the actual panel, does it rest on top of the pads (sensors) just like the acrylic sheet, with no air gaps?  Reason I ask is any air gap will drastically reduce sensitivity.

    BTW, what is the thickness of the acrylic sheet and the actual panel?

    Do you have the ability to send data from the MSP430FR2633 to the Captivate GUI?

  • +1 in reply to Dennis Lehman
    Prodigy 30 points

    Yes, We connected the IC with the GUI and altered the threshold and capacitive parameters and the issue got resolved

**Attention** This is a public forum