LCD Touch Buttons

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  • What is the technology behind the LCD touch buttons?

    I noticed that sometimes they are activated with false positive, assume high temperate changes becuase i open the fridge and it activate. Just curious what is driving them?

  • Bangle.js: Opening and re-assembling

    In this video i notice 4 connections coming out of the display, does that mean it has 4 touch locations?

  • What is the advantage to having only 2 touch spots on the display, compared to entire screen being touch? Less software operation ? Or when they only want to detect swipe action?

  • Is the 2 touch feature a hardware limitation or a software/design limitation?

  • https://youtu.be/tPx2d493GoI?t=90


    Found this at 1:30 you see something which might be very similar?

    Capacitive Sensing, think its this
    https://www.youtube.com/watch?v=bhspPkxO­Mxs

  • As far as I can tell the display is 4 areas, but because of the limits of the touch chip they use, they are connected together into just 2 areas. I think the limit is probably because of a lack of IO on the microcontroller.

    I think the actual controller is the Holtek BS83A02A - link to datasheet on https://www.espruino.com/Bangle.js+Techn­ical#hardware

    Honestly, I'm not sure about what could be causing the accidental triggering - but as far as I can tell the touch controller automatically calibrates, so if the capacitance around it changes suddenly it might trigger.

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LCD Touch Buttons

Posted by Avatar for d3nd3-o0 @d3nd3-o0

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