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[ESC] Capacitive touch PIC for a dollar

Catwell
During a visit to the ESC expo in Chicago, I stumbled across Microchip's PIC16F707 microcontroller. The next big thing from Microchip, as they told me. The main feature making this particular uC stand out is the mTouch, projected capacitive touch-screen sensing technology, built right into the chip. And to top that off, you get royalty-free code to use for developing mutitouch interfaces. This chip is currently only supporting 2 simultaneous inputs, but the code also supports gestures. So, this is leaps and bounds over the classic single touch environments of the past. The absolute best part of this whole offering is the price, $0.99 cents in volume, and approximately $3-$5 dollars for small quantities.


Now, what is a good source for capacitive touch panels?

 
What I want now is a PIC with multitouch and PWM motor driving capabilities.


Cabe
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  • 0

    hi,

     

    Microchip always makes innovations in their product portfolio with reasonable prices.

     

    But i have a question.. : a capacitive touch panel versus a resistive touch panel. Which is the best ? What are their advantages and disadvantages ? In which application would we better use which one ?

     

    Firat

  • 0 in reply to firatkocak

    Hi Firat,

     

    A resistive touchscreen panel is composed of several layers, the most important of which are two thin, metallic, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point: the panel then behaves as a pair of voltage dividers with connected outputs. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing.

     

    A capacitive touchscreen panel consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO).[6][7] As the human body is also a conductor, touching the surface of the screen results in a distortion of the body's electrostatic field, measurable as a change in capacitance. Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing

     

     

    Technology
    		4-Wire ResistiveSurface Acoustic Wave5-Wire ResistiveInfraredCapacitive
    Durability3 year5 Year5 Year5 Year2 Year
    StabilityHighHigherHighHighOk
    TransparencyBadGoodBadGoodOk
    InstallationBuilt-in/OnwallBuilt-in/OnwallBuilt-in/OnwallOnwallBuilt-in
    TouchAnythingFinger/PenAnythingFinger/PenConductive
    Intense light-resistantGoodGoodGoodBadBad
    Response time<10ms10ms<15ms<20ms<15ms
    Following SpeedGoodLowGoodGoodGood
    ExcursionNoSmallBigBigBig
    Monitor optionCRT or LCDCRT or LCDCRT or LCDCRT or LCDCRT or LCD
    WaterproofGoodOkGoodOkGood

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  • 0 in reply to firatkocak

    Hi Firat,

     

    A resistive touchscreen panel is composed of several layers, the most important of which are two thin, metallic, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point: the panel then behaves as a pair of voltage dividers with connected outputs. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing.

     

    A capacitive touchscreen panel consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO).[6][7] As the human body is also a conductor, touching the surface of the screen results in a distortion of the body's electrostatic field, measurable as a change in capacitance. Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing

     

     

    Technology
    		4-Wire ResistiveSurface Acoustic Wave5-Wire ResistiveInfraredCapacitive
    Durability3 year5 Year5 Year5 Year2 Year
    StabilityHighHigherHighHighOk
    TransparencyBadGoodBadGoodOk
    InstallationBuilt-in/OnwallBuilt-in/OnwallBuilt-in/OnwallOnwallBuilt-in
    TouchAnythingFinger/PenAnythingFinger/PenConductive
    Intense light-resistantGoodGoodGoodBadBad
    Response time<10ms10ms<15ms<20ms<15ms
    Following SpeedGoodLowGoodGoodGood
    ExcursionNoSmallBigBigBig
    Monitor optionCRT or LCDCRT or LCDCRT or LCDCRT or LCDCRT or LCD
    WaterproofGoodOkGoodOkGood

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