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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

    Firat,

     

    It depends on your application. Resistance, until recently, only allowed for a single touch to be registered. So, often were used to create simple GUIs, buttons, menu systems, with simple dragging of a single point. And with resistive, people wearing gloves can actuate the screen. Often useful for medical and industrial environments. Resistive is also prone to drifting in it's touch accuracy. So, regular calibration is needed. However, they are pressure sensitive, so you can detect light to heavy presses. And resistive often has a rather spongy, elastic screen surface.This, as I've seen, can really wear out the screen if it consistently get's pounded on by users.

     

    Capacitive needs an actual electrical connection made on the surface, either with a bare finger or conductive stylus. Some companies are making gloves that are conductive now, but major adoption of that feature may be way off. Capacitive often has a hard surface, glass or plastic. Which can tolerate some rather heavy use. But, the screens are not indestructible. I have seen workers user wrenches and screw drivers on capacitive panels before, and, or course, end up cracking the screens a bit.

     

    Just a brief overview of the difference. Hope this helps.

     

    Cabe

  • 0 in reply to Catwell

    Hi Cabe,

     

    Thank you very much for the information. It really helped. Currently i have two projects in my mind. First will be an industrial controller for temperature and humidity, so it will be used in dusty environments. The second one will be used in office or home areas and it will be lightment controll application. I think resistive touch panel is better for me. I have a Cypress Cap Sense dev kit but i could not have a chance to examine it yet. I think i should give it a try for testing capacitive technology.

     

    Thanks again.

     

    In the meantime, i am fallowing almost all of your messages. Honestly, thanks god that you are a member of Element-14.

     

    Firat

  • 0 in reply to firatkocak

    Hi Firat,

     

    may i know which demo board from cypress you have? and

     

    what is your project requirement so that i can help you in suggesting right device

     

    Best Rgds

    Bheema

  • 0 in reply to bheemarao

    Hi Bheema,


    It is CY3203A - CapSense Successive Approximation (CSA)  Training Kit. I think ,Capacitive touch sensing is not good for a industrial application. But in the Lightment Controller, it may be used. I am thinking of designing a slider to control the light intense in a room or office or where it is available.


    I am just thinking and have not started yet. An also thanks for your fallowing message.

     

    Firat

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  • 0 in reply to bheemarao

    Hi Bheema,


    It is CY3203A - CapSense Successive Approximation (CSA)  Training Kit. I think ,Capacitive touch sensing is not good for a industrial application. But in the Lightment Controller, it may be used. I am thinking of designing a slider to control the light intense in a room or office or where it is available.


    I am just thinking and have not started yet. An also thanks for your fallowing message.

     

    Firat

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