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Thread: How To? Parts list?

  1. #11
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    David,

    http://doityourselfchristmas.com/wik...y_Instructions

    Nice edits to the WIKI, thanks!
    [B]John[/B]
    [url]www.xmasinmelb.com[/url] General Site
    [url]www.xmasinmelb.com/zencart/[/url] Online Store

    [SIGPIC][/SIGPIC]

  2. #12
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    Quote Originally Posted by wjohn
    David,

    http://doityourselfchristmas.com/wik...y_Instructions

    Nice edits to the WIKI, thanks!
    Your welcome John! I am in the process of building the interface cable and the LED matrix ... I will update wiki once again (with text and photos) as each task is completed.

    David 8)

  3. #13
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    Default Re: Cable Making / Wiki

    Quote Originally Posted by stempile
    Dave -

    Wiki Notes
    Now that the Wiki is here, building / Updating an external doc is no long needed. Also you don't have to ask permission to add / update the wiki. The wiki is owned by everyone that contributes to it. Also if someone doesn't like your changes, they will update your work. Thats where the wiki power comes in.

    Cable Notes
    You mentioned that you were building the cable. I hope you aren't spending much time on it (maybe you are already doing this?). This is how can build the cable in 30 seconds:
    http://www.mouser.com/search/Product...ey601-40-9588M

    Mouser #601-40-9588M

    Use a DB25 Male to RJ45 Connector. I didn't use this exact one, I have a pile of them from various other project. All you do is push the pins from the RJ45 plug through the holes of the DB25 plug (based on the wire pin out on the PCB) and you are done. A normal cat-5 patch cable is then used between the connector and the LedTricks board. Easy Easy!

    ms
    Matt,

    I ordered this part and have been trying to integrate it into the design as you proposed. The problem is that the pins out on page 9 of the .pdf draft version list NINE connections ... the CAT-5 cable only has eight (as well as the modular plug on the afore-mentioned product you listed as a link). So, I contacted one of the tech guys at Allied Electronics, showed him the .pdf draft manual, and this was his response:

    "After reading your PDF file this goes to the Parallel printer port on a PC and that is a 25 pin female (on the PC itself) which requires a 25 pin male connector

    The part you've asked about is a female
    The Allied number 510-3161 is the male version

    But there is a problem I don't understand how to get around

    The RJ-45 connector uses 8 pins
    looking at your DB25 connector pin-out on page 8 it uses 9 pins
    I can't get 9 wires into a 8 wire connector.

    You might want to ask the group that's doing this project how they accomplish this.


    Jim Beard
    Group # 682-757-9204
    Direct # 817-595-8511

    Technical Sales Specialist
    Allied Electronics Inc.
    Fort Worth, TX
    817.595.8620 FAX"


    ANY HELP AND/OR FEEDBACK WOULD BE APPRECIATED!!!

    David

  4. #14
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    The ground does not go to the rj45.

    If you use the PS from the control pc you dont need a ground.
    If you use a external PS you need a ground wire from the control PC to the PS.

  5. #15
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    Not having a signal return wire (a ground wire, in this case) in that cable is poor practice. Relying only on a ground wire in the power supply cabling (or a separate wire) means that the system will be fairly susceptible to interference from AC and every other signal floating through the air, as well as quite prone to radiating as well.

    If I were building one or more of these boards (which I'm not), I would rework the boards to remove one of the strobe signals from the interface cable (tie pin 4 of the MBI chips to pin 1 of the 4514, and get KC to change the plugin if necessary), and use the leftover pin on the interface cable for ground.

    --

    Phil

  6. #16
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    Quote Originally Posted by Ronp
    The ground does not go to the rj45.

    If you use the PS from the control pc you dont need a ground.
    If you use a external PS you need a ground wire from the control PC to the PS.
    That's what I thought ... the table on page 9 in very deceiving. Thanks for the info Ron!

    David

  7. #17
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    David,

    During the many changes that were made in the evolution of the LedTriks many users wanted a number of panels daisy chained. Due to data transfer speed limits I used a different data line for each of the four supported panels which left no conductors for the ground. Since we intended to use remote power supplies to feed it there was no problem to connect the ground on the computer end and allow me to support 4 units.

    At the time it seemed like a good idea. 8)

  8. #18
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    Quote Originally Posted by RJ
    David,

    During the many changes that were made in the evolution of the LedTriks many users wanted a number of panels daisy chained. Due to data transfer speed limits I used a different data line for each of the four supported panels which left no conductors for the ground. Since we intended to use remote power supplies to feed it there was no problem to connect the ground on the computer end and allow me to support 4 units.

    At the time it seemed like a good idea. 8)
    Gotcha RJ - information received and understood. My understanding regarding this issue is that the newer laptop RS232 ports provide enough voltage to run the board without the need for an external power supply (transformer) - is that correct? If so, my laptop, although 3 years old, has a CPU clocked at 3.8 GHz and contains 2GB of memory; I assume that this would be sufficient enough to reach approx. +5 volts (and register a logic 1) out of my RS232. My plan (on this board) is to power the LEDTRIKS board directly from my laptop (although I have not actually physically measured the voltage out ... just an assumption)

    David

  9. #19
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    I don't think that you can power the LEDtriks board from the RS232 serial ports (of any vintage). Even if you added a regulator to take the +12V (give or take) of the RS232 signals down to 5V, there isn't enough current available for powering the controller. The RS232 ports can only provide a milliamps of current, far less than what is needed. You need a beefy supply for the LEDtriks board (since the full current for the LEDs is drawn from the power supply for the LEDtriks).

    --

    Phil

  10. #20
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    Default Re: Cable Making / Wiki

    Quote Originally Posted by dvanteslaar
    Quote Originally Posted by stempile
    Dave -

    Wiki Notes
    Now that the Wiki is here, building / Updating an external doc is no long needed. Also you don't have to ask permission to add / update the wiki. The wiki is owned by everyone that contributes to it. Also if someone doesn't like your changes, they will update your work. Thats where the wiki power comes in.

    Cable Notes
    You mentioned that you were building the cable. I hope you aren't spending much time on it (maybe you are already doing this?). This is how can build the cable in 30 seconds:
    http://www.mouser.com/search/Product...ey601-40-9588M

    Mouser #601-40-9588M

    Use a DB25 Male to RJ45 Connector. I didn't use this exact one, I have a pile of them from various other project. All you do is push the pins from the RJ45 plug through the holes of the DB25 plug (based on the wire pin out on the PCB) and you are done. A normal cat-5 patch cable is then used between the connector and the LedTricks board. Easy Easy!

    ms
    Matt,

    I ordered this part and have been trying to integrate it into the design as you proposed. The problem is that the pins out on page 9 of the .pdf draft version list NINE connections ... the CAT-5 cable only has eight (as well as the modular plug on the afore-mentioned product you listed as a link). So, I contacted one of the tech guys at Allied Electronics, showed him the .pdf draft manual, and this was his response:

    "After reading your PDF file this goes to the Parallel printer port on a PC and that is a 25 pin female (on the PC itself) which requires a 25 pin male connector

    The part you've asked about is a female
    The Allied number 510-3161 is the male version

    But there is a problem I don't understand how to get around

    The RJ-45 connector uses 8 pins
    looking at your DB25 connector pin-out on page 8 it uses 9 pins
    I can't get 9 wires into a 8 wire connector.

    You might want to ask the group that's doing this project how they accomplish this.


    Jim Beard
    Group # 682-757-9204
    Direct # 817-595-8511

    Technical Sales Specialist
    Allied Electronics Inc.
    Fort Worth, TX
    817.595.8620 FAX"


    ANY HELP AND/OR FEEDBACK WOULD BE APPRECIATED!!!

    David

    I use a cable from my bench top supply with an alligator clip hooked to the PC case. Works fine for the bench. I have only 3 panels so might make a cable with the extra single wire not connected like what Phil mentioned. Then again just clip it to the PC case.

    ms
    Matt Stemple

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