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03-30-2004, 04:23 PM
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#1
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MediaCar Developer/Moderator
Join Date: Feb 2003
Location: Belgium
Posts: 520
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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 
Last edited by coyote; 03-30-2004 at 04:28 PM.
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03-30-2004, 05:30 PM
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#2
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Variable Bitrate
Join Date: Mar 2004
Posts: 300
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Nice Thanks!
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03-30-2004, 06:09 PM
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#3
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Newbie
Join Date: Feb 2004
Posts: 51
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Has anyone else tried this and confirmed that it works?
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03-30-2004, 06:14 PM
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#4
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Raw Wave
Join Date: Oct 2003
Location: Madrid
Posts: 1,983
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Quote: Originally Posted by el bob
Has anyone else tried this and confirmed that it works?
You think El Coyote is lying??
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03-30-2004, 09:36 PM
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#5
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MediaCar Developer/Moderator
Join Date: Feb 2003
Location: Belgium
Posts: 520
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Quote: Originally Posted by el bob
Has anyone else tried this and confirmed that it works?
Yes, me 
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03-31-2004, 03:41 AM
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#6
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Maximum Bitrate
Join Date: Nov 2003
Posts: 862
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will the poweron/power off by button still work with this setup? thanks!
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03-31-2004, 06:30 AM
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#7
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MediaCar Developer/Moderator
Join Date: Feb 2003
Location: Belgium
Posts: 520
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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.
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03-31-2004, 10:32 AM
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#8
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Confusion Master
Join Date: Sep 2003
Location: If you go down to the woods today, You're sure of
Posts: 11,928
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noted. 
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03-31-2004, 11:15 AM
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#9
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Raw Wave
Join Date: Mar 2004
Location: Redondo Beach, CA
Posts: 1,969
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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.
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03-31-2004, 11:18 AM
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#10
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Raw Wave
Join Date: Mar 2004
Location: Redondo Beach, CA
Posts: 1,969
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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?
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04-01-2004, 02:15 PM
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#11
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Maximum Bitrate
Join Date: Nov 2003
Location: Sharon, PA
Posts: 507
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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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04-01-2004, 02:21 PM
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#12
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Raw Wave
Join Date: Jun 2000
Location: Nashville
Posts: 2,635
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hmmm.... may have to try that.
but I wonder, how/why exactly does that work?
__________________
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04-02-2004, 07:42 AM
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#13
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It's not really that small...No, seriously.
Join Date: Feb 2004
Location: Florida
Posts: 1,047
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Quote: 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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04-02-2004, 09:41 AM
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#14
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MediaCar Developer/Moderator
Join Date: Feb 2003
Location: Belgium
Posts: 520
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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
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04-02-2004, 10:37 AM
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#15
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Newbie
Join Date: Sep 2003
Location: Finland
Posts: 31
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success!
I did this modification and it works just great!
Thanks Coyote! 
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