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My solution to Auto Power ON Lilliput screen

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  • My solution to Auto Power ON Lilliput screen

    For those who want that their Lilliput screen power ON automatically when the power supply is applied on :



    Coyote
    www.media-car.fr.st
    The first Belgian PC fully integrated in a car :)

  • #2
    Nice Thanks!
    www.i-hacked.com Hardware hacking articles

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    • #3
      Has anyone else tried this and confirmed that it works?

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      • #4
        Originally posted by el bob
        Has anyone else tried this and confirmed that it works?
        You think El Coyote is lying??
        Laidback


        The ultimate CarPC - Wow!

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        • #5
          Originally posted by el bob
          Has anyone else tried this and confirmed that it works?
          Yes, me
          www.media-car.fr.st
          The first Belgian PC fully integrated in a car :)

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          • #6
            will the poweron/power off by button still work with this setup? thanks!
            Cheap Laptop, great for Carputer!

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            • #7
              Yes, every things still working after this modification, you can switch OFF the screen, switch ON, ... the only différence is that the screen always switch ON automatically when you put the power supply ON.
              www.media-car.fr.st
              The first Belgian PC fully integrated in a car :)

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              • #9
                My Lilliput isn't here yet, but I was already thinking of how to solve this problem with a micro relay. I like your circuit better though!

                If I understand it right, the common node between the resistor and capacitor is briefly pulled down to ground when the power is first applied. Once the capacitor charges, the point is pulled up to 5v through the resistor.

                One thing confuses me though, what is the point on the other side of the resistor that was removed? Isn't it also 5v? If so, wouldn't it be possible to build your circuit without removing the surface mount resistor? I'm probably confused. Feel free to slap me.
                2004 4runner

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                • #10
                  Also, how long does it take that cap to discharge once the power is removed? Supposed the power is removed and restored very quickly (perhaps during cranking). Does the LCD come back on?
                  2004 4runner

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                  • #11
                    Hey Coyote, could you repost that pic. I think it outlived the link or something.

                    Thanks,
                    Tom

                    EDIT:
                    Nevermind. I'm just a bonehead. My connection is filtered and the pic's host was filtered.
                    So far:
                    M10000 Nehemiah, 1Gb RAM, Opus 90w PS, Buffalo Tech WLI2-USB2-G54, 160 Gb HDD, GlobalSat BU-353 GPS, iGuidance, Zippy EL-610, Panasonic CW8123B Slim Slot CDRW/DVD, 10" Lilliput, Sony XA-300, Sony CDX-MP30 Head, OBD-II

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                    • #12
                      hmmm.... may have to try that.

                      but I wonder, how/why exactly does that work?
                      Debt as of 1/1/05: $34,354.48
                      Debt as of July 4, 2007: $0.00 explanation
                      I'M DEBT FREE!!
                      I'm now a reasonably successful gunblogger.

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                      • #13
                        Originally posted by wizardPC
                        hmmm.... may have to try that.

                        but I wonder, how/why exactly does that work?

                        Yes please explain how it works. And what size soldering iron are you using to get such clean, small solders... Mine never look that good!
                        '02 GTI
                        [Routis '04] [Opus 90W] [160GB Maxtor HD]
                        [Lilliput 7" TS] [VIA M10000] [XMPCR]
                        [512MB RAM] [Custom housing]
                        [Deluo GPS Mouse] [E-MU 0404 Soundcard]
                        Progress Meter: [==============|] 99.9%

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                        • #14
                          I have updated the picture with the circuit diagram .

                          When the power supply is applied, this circuit maintains the uC (Microcontroler) "PowerOn" input at a low level during a short delay as if you are pressing the power button > your lilliput switch ON.

                          Coyote
                          www.media-car.fr.st
                          The first Belgian PC fully integrated in a car :)

                          Comment


                          • #15
                            success!

                            I did this modification and it works just great!

                            Thanks Coyote!

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