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7" Zed Touch Display Kit multi-touch capability

Former Member

Hello everybody,

I am interested in the Zed Touch Display Kit, but I found an surprising fact - tech sheet states it's only single-touch.

Is it really true? Or, is there any way of getting multi-touch capability from the Kit?

Regards,
Peter

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    Hi Peter,

    Although the Cypress TMG120 controller used on this touch display kit is technically capable of detecting more than a single touch, the touch controller on the flex tail has been tuned to support only a single touch with this PCAP sensor.  We focused instead on implementing other features such as water droplet rejection, glove usage, and noise immunity.

    The Zed Touch Display Kit was targeted at embedded industrial applications and although we provide a reference design to show the touch screen working with Ubuntu Linux, it is designed to not rely upon a full OS running on the processor.  This was also one of the motivations for moving to an I2C host interface rather than use USB like so many other touch controllers on the market currently support.

    Implementing multi-touch support is relatively complicated and would likely require the use of a full OS (such as Linux, Android, or Windows 8) to implement especially if the host interface were USB.  When we originally looked at adding a touch display, Linux had limited support for multiple touch devices.  According to this article, it looks like additional multi-touch support was added a few releases ago:

    http://stackoverflow.com/questions/16976512/does-linux-support-multi-touch-screen

    Can you please describe your application further and tell us some more detail on why the multiple touch capability is needed?  Feel free to private message me if you necessary.

    If you are looking for multi-touch support, Avnet has a number of other touch sensors on their line card which support multiple touch.  One of those suppliers is Panjit Touch Screens:

    http://www.em.avnet.com/en-us/design/linecard/Pages/PanJit-Touch-Systems.aspx

    Regards,

    -Kevin

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    Hi Peter,

    Although the Cypress TMG120 controller used on this touch display kit is technically capable of detecting more than a single touch, the touch controller on the flex tail has been tuned to support only a single touch with this PCAP sensor.  We focused instead on implementing other features such as water droplet rejection, glove usage, and noise immunity.

    The Zed Touch Display Kit was targeted at embedded industrial applications and although we provide a reference design to show the touch screen working with Ubuntu Linux, it is designed to not rely upon a full OS running on the processor.  This was also one of the motivations for moving to an I2C host interface rather than use USB like so many other touch controllers on the market currently support.

    Implementing multi-touch support is relatively complicated and would likely require the use of a full OS (such as Linux, Android, or Windows 8) to implement especially if the host interface were USB.  When we originally looked at adding a touch display, Linux had limited support for multiple touch devices.  According to this article, it looks like additional multi-touch support was added a few releases ago:

    http://stackoverflow.com/questions/16976512/does-linux-support-multi-touch-screen

    Can you please describe your application further and tell us some more detail on why the multiple touch capability is needed?  Feel free to private message me if you necessary.

    If you are looking for multi-touch support, Avnet has a number of other touch sensors on their line card which support multiple touch.  One of those suppliers is Panjit Touch Screens:

    http://www.em.avnet.com/en-us/design/linecard/Pages/PanJit-Touch-Systems.aspx

    Regards,

    -Kevin

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