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Touch Screen's Kit Development

ctorres

New member
Hi,

I am developing a microcontroller-based system with PSoC and I would like to know all that I need to connect the system with a touch screen (software, testing, ...)

Thanks

Best regards

Carlos Torres.
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Last edited:

CF Support2

Administrator
The touch screen is an "Analog 4-wire" there is no controller on board.

The touch screen must be driven in one direction, then read in the other direction. TI makes a low-level part that
has the drivers and ADC built into one part. Some micros have analog
inputs that may work directly. There is a company <http://www.tsharc.com/> that makes a high-level controller from a
pre-programmed PIC micro.

Basically you put a gradient across one set of electrodes (both set as digital outputs, drive one high and the
other low), then you look at either of the other set of electrodes (both set as
inputs, at least one analog). The analog input will pick up the voltage of the gradient at the contact point. To
read the other channel, you just rotate the whole process 90 degrees:

http://www.elotouch.com/products/accutec/accworks.asp

This description is just a conceptual outline, I am sure there are many other nuances to be addressed (references,
calibration, drift, non-contact,detecting "taps" and "double-taps").

Some diagrams of 4-wire:

http://www.amtouch.com.tw/basics/resistive_touch_screen_structure.htm

Here is a bunch of book-marks on touchscreen controllers:

http://www.howstuffworks.com/question716.htm
http://www.microtouch.com/mthtml/03h_specs.htm
http://products.analog.com/products/info.asp?product=AD7843
http://www.icst.com/products/mk715.html
http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2755
http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=ADS7843
http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=TSC2003
http://focus.ti.com/docs/prod/folders/print/tsc2003.html
http://www.tsharc.com/

Software graphics driver library:

http://www.ramtex.dk/products/lcdd07xx.htm
 

ctorres

New member
I'm very interesting in your touch screens but I would want to know all the sound the shipping costs of sending to Europe (Spain).

Thank you!

Regards
 

ctorres

New member
I have made an order for 2 Grafic LCDs, specifically, CFAG240128LTMITZTS and CFAX12864CP1WGHTS. What kind of connector do I need for connect the LCD's I/O with a microcontroller?
 
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