Compact dual monitor VGA adapter for P2ES

TubularTubular Posts: 3,558
edited 2019-05-03 - 22:15:15 in Propeller 2
I'm working on a compact adapter for P2ES that allows connection of two VGA monitors.

The VGA connectors are 35mm apart to allow room for chunky VGA connectors. The connectors are slimline Norcomp and their backs butt up against the edge of the P2ES for support, so it should feel nice and rigid. The corners are chamfered to allow access to things like the reset button and aux usb leds.

OzProp has been showing me the benefits of having two monitors for self hosted development. As a result I've added connection pins for USB keyboard. For now I just intend to solder a short female USB A lead to these pins.

I'll put this up on OSHPark when finished. They're $6.80 for 3 pcbs

Comments

  • jmgjmg Posts: 13,462
    That's nifty. A part code for the VGA connector could help ?
  • roglohrogloh Posts: 1,054
    edited 2019-05-04 - 00:07:36
    Very nice. This looks rather handy Tubular (you can count on me to be a local participant if you intended to order 3 boards right away and the connectors). I can certainly see the benefit of a dual VGA debug system, especially if you were doing video driver development in a standalone self-hosted system. What are those passive components labelled L5 and 13 fitted for? Filters or voltage selectors?
  • Sure thing

    L5 is a led plus resistor off pin P5 (or 21 or 37), and L13 similar

    P6 and P7 nominally for a USB keyboard.

    Connectors are NORCOMP 200-015-213L537
  • roglohrogloh Posts: 1,054
    edited 2019-05-04 - 00:19:58
    Sound good, I just hope there is enough PCB left for strength in the middle during removal and it doesn't snap in two. Will have to be somewhat careful when removing it that it doesn't try to flex right at that point. Only seems like about 5mm or so left of board there. If the two VGA connectors were touching each other at the middle that might stop that but it may not leave room for wiring to extra pins etc, unless they are accessible from the other side.

    Edit: It might not also allow the VGA connector housings to fit either, so closer might not be doable.
  • jmgjmg Posts: 13,462
    rogloh wrote: »
    Sound good, I just hope there is enough PCB left for strength in the middle during removal and it doesn't snap in two..

    Does it even need that bite ? It may not be large enough to allow a croc clip anyway, and there are other GND posts ?

  • Doesn't have to have the bite. Using normal 11mm headers the PCB sits in a plane above it, anyway

    If we lose it, we can have pads for a vertical usb A connector in the middle, maybe even a horizontal one
  • roglohrogloh Posts: 1,054
    edited 2019-05-04 - 01:57:47
    Sounds even better then. USB should directly allow additional keyboard etc in the dual monitor setup without burning another connector spot. Would two normal VGA connectors be possible with USB cable in the middle?
    Another option if PCB routing easily supports it is to put a USB (or two) at the outer edge(s) of the VGA connectors, though that increases the size/cost of your board.
  • I'll make up a couple of mechanical 1:1 prints and see what looks like it'll fly
  • jmgjmg Posts: 13,462
    Tubular wrote: »
    Doesn't have to have the bite. Using normal 11mm headers the PCB sits in a plane above it, anyway

    If we lose it, we can have pads for a vertical usb A connector in the middle, maybe even a horizontal one

    That could be useful. I guess a full size USB-A is more keyboard common, and there seem to be some quite strong right angle vertical ones.
  • TubularTubular Posts: 3,558
    edited 2019-05-04 - 05:51:47
    Yeah, going with a Wurth right angle vertical one. If it doesn't work out, we can solder a short usb A socket cable

    Here's the updated design with the USB A connector in the middle. Both leds have been moved up adjacent to the USB connector.

    263 x 1301 - 14K
  • jmgjmg Posts: 13,462
    Tubular wrote: »
    Yeah, going with a Wurth right angle vertical one. If it doesn't work out, we can solder a short usb A socket cable
    Here's the updated design.
    Looks good, the Wurth one is quite expensive, I think the Assmann WSW Components AE11178-ND (A-USB A-E) is very similar, and is just 78c/10+,

  • Yep I think that one would work just fine, too.
  • roglohrogloh Posts: 1,054
    edited 2019-05-04 - 06:49:21
    @Tubular. When fitted, do the VGA connectors hang below the board (ie. mounted upside down) or above? Do you intend to use those two way type pin header mounting blocks or the through hole mounting types Parallax used, lowering the board height and potentially causing ground post clearance issues?

    Edit: re-read your first post, and I guess it looks like you are mounting them below the board.
  • The VGA connectors hang down (on the underside of the board). Just using standard (11mm) or low profile (5 mm) female headers (depending on what works best for VGA connector who will be close to 'desk' level.

    The USB A female connector however is 'above' the PCB, and I may even solder it 1 or 2mm above its normal height, depending on clearance from the VGA plugs

    The ground post itself isn't that high, it won't cause drama

  • Neat! :cool:
    Melbourne, Australia
  • Photos, or it didn't happen...

    Board 1 featuring 'elevated' USB connector feature

    3456 x 4608 - 3M
    3456 x 4608 - 3M
  • Thats right, "Brady bunch" formation
  • Nice :smiley:
    My Prop boards: P8XBlade2, RamBlade, CpuBlade, TriBlade
    Prop OS (also see Sphinx, PropDos, PropCmd, Spinix)
    Website: www.clusos.com
    Prop Tools (Index) , Emulators (Index) , ZiCog (Z80)
  • Looks good Tubular. Now, what to try with 8 monitors and a P2...?
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