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Participant

Join Date: Mar 2008
Posts: 2

how touch pads work

04/05/2008 7:07 AM

Guys I need to know how touch pads work and their links (if u can give)

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Guru

Join Date: Sep 2007
Posts: 1818
Good Answers: 7
#1

Re: how touch pads work

04/05/2008 9:00 AM

http://en.wikipedia.org/wiki/Touchpad

That is simple and effective. If you need more or detailed information you should ask for it in more detail and tell us what you already know yourself and what you expect.

Good luck.

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Anonymous Poster
#2

Re: how touch pads work

04/11/2008 2:50 PM

It's very simple, you touch it and it pads.

Just like an interocceter....

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Guru
India - Member - Sensors Technology Popular Science - Cosmology - Dream, Think and Act United Kingdom - Member - New Member United States - Member - New Member Canada - Member - New Member

Join Date: Aug 2006
Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India
Posts: 3408
Good Answers: 32
#3

Re: how touch pads work

05/18/2008 2:25 AM

touch pads are often simple capacitive sensors. your finger increases the capacitance. Touch screens are resistive position sensitive detectors with four terminals for position mapping. Where you tough that pint dips and makes contact with conductive layer. Resistance to four points is then mapped with respect to the touch point mathematically using resistance ratio for position.

You may also find optical touch sensor now. Old micro-switch and magnetic reed relay contacts were tactile touch sensors. Capacitive and optical sensors can work even from distance and they are also used on key pads and panels. These sensors are free from mechanical ware and tare (wear and tear).

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Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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Anonymous Poster
#4
In reply to #3

Re: how touch pads work

12/10/2008 7:31 PM

Clearly capacitive sensors have been the rage with notebook touch pads and in the cell phone market, but do you know what technical reasons why optical (a photodiode grid) is not just as viable or seen as commonly today?

Thanks.

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