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Blog Cheap portable LCD for Raspberry Pi
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  • Author Author: fustini
  • Date Created: 4 Jul 2012 6:36 AM Date Created
  • Views 4288 views
  • Likes 2 likes
  • Comments 25 comments
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Cheap portable LCD for Raspberry Pi

fustini
fustini
4 Jul 2012

I've been wanting a small portable display for the Pi.  Unfortunately, portable HDMI displays are quite expensive, and the DSI connector is not an option currently as far as I know.  Then I realized that there a large number of small composite LCDs available which are intended for use in vehicles for backup rearview cameras.  I bought this inexpensive LCD on Amazon, the 3.5 Inch TFT LCD Monitor for Car / Automobile by kingsmart for $21.48 (my order was sold by ePathDirect and fulfilled by Amazon):

imageimage

It arrived today, and I put the photos I took in a Picasa gallery.  I hooked it up to my bench power supply and simply connected it's yellow connector to the composite output on the Pi.  The monitor displayed the Pi's ouptut ok right at power on, through the boot process and beyond.  As I expected, the resolution is poor, especially for small text, given it is standard definition and connected with composite.  However, I'm intending to use this monitor to display tweets, so I can increase the font size as tweets are only 140 characters.  I think this monitor will also be handy for basic troubleshooting when ssh or serial won't suffice, and I don't want to bother with a regular sized monitor.

 

Anyone have any other ideas for inexpensive displays?

 

Cheers,

Drew

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Top Comments

  • sknipas
    sknipas over 13 years ago +1
    I have a 9 inch monitor from an old mini laptop. I also bought a lvds controler from e-bay and I am planning to use this monitor and the r-pi as a car pc. Screen resolution goes up to 1024x600.
  • Former Member
    Former Member over 13 years ago in reply to fustini +1
    It works quite well... But there are some minor disadvantages... 1. you have to concentrate your eyes to have the two displays properly over each other so you have a single image 2. the border region is…
  • jeffbiss
    jeffbiss over 12 years ago in reply to fustini +1
    Now that you mention it, I did the same thing and plumb forgot about it because the screen came with no information! The LCD uses about 5 VDC and has a regulator internally that reduces the car's 12 VDC…
  • fustini
    fustini over 12 years ago in reply to Former Member

    You might want to check out Chalk Elec: http://www.chalk-elec.com/?p=1576

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  • Former Member
    Former Member over 12 years ago in reply to sknipas

    How did you use the 9" inch monitor? I too have a 9" HP mini netbook that I would like to use the monitor. Can I leave the monitor attached to the netbook and use the monitor and keyboard? Or do I need to remove the monitor from the netbook and  buy a USB keyboard? How to connect the monitor to the raspberry pi?

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  • jeffbiss
    jeffbiss over 12 years ago in reply to fustini

    Now that you mention it, I did the same thing and plumb forgot about it because the screen came with no information! The LCD uses about 5 VDC and has a regulator internally that reduces the car's 12 VDC to what the LCD needs.

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  • fustini
    fustini over 12 years ago in reply to jeffbiss

    After initial testing with the bench power supply, I used a universal DC adapter (1A) with adjustable output to try different voltages.  I believe the manual for http://www.amazon.com/gp/product/B0045IIZKU/ref=oh_details_o03_s00_i00 listed a suprising 6V-32V range.  I never tried more than 12V, but to my pleasant surprise it worked fine down at 5V.  This allows me to just use a battery-powered USB charger to run it (with a chopped up USB cable going into the barrel to screw terminal jack).

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  • jeffbiss
    jeffbiss over 12 years ago in reply to Former Member

    It needs a 12 VDC power supply with power on the center contact. The adapter's receptacle measures ~2mm ID (2.1mm as Drew notes) and the ground barrel is ~5.8mm OD. Drew's suggested adapter will work but needs a 12VDC power supply, which is not an issue if you can find a 12 VDC wall adapter.

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