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Thread: NEW - PropController Project

  1. #21
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    Default Re: NEW - PropController Project

    Quote Originally Posted by n1ist View Post
    Looking at the TI datasheet for the SN75176, the differential output voltage |VOD2| is specified at 2.7 V with a 100R load. So power dissipation would be 61 mW, so a 1/8W resistor should be fine.
    /mike
    I was basing my numbers on the DMX spec, which allows for a differential voltage of >12V I believe. Maybe that's so uncommon as to not have to worry about. Even at 5V a 1/4 watt would work.

  2. #22
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    Default Re: NEW - PropController Project

    Quote Originally Posted by jstjohnz View Post
    I was basing my numbers on the DMX spec, which allows for a differential voltage of >12V I believe. Maybe that's so uncommon as to not have to worry about. Even at 5V a 1/4 watt would work.
    I use 1/4W and never had an issue.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
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  3. #23
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    Default Re: NEW - PropController Project

    Well more parts came in yesterday, and I got the DMX portion of PCB populated and it tested out perfectly. I'm able to receive and transmit DMX. So far no mods.

    All that is left is the USB interface, which is fully populated except for the connector. I will report back once I test that out.
    Last edited by DynamoBen; 09-26-2010 at 04:36 PM.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  4. #24
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    Default Re: NEW - PropController Project

    I tested the helix 32 channel forward-phase dimming code on the PropController and it worked perfectly. I will post the code here for now, it will eventually live in a wiki entry.

    Update: New driver later in thread
    Last edited by DynamoBen; 10-12-2010 at 07:46 PM.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  5. #25
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    Default Re: NEW - PropController Project

    Quote Originally Posted by DynamoBen View Post
    I tested the helix 32 channel forward-phase dimming code on the PropController and it worked perfectly. I will post the code here for now, it will eventually live in a wiki entry.
    Is there something unique/better/different about Greg's dimming code versus how say a Renard works?
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  6. #26
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    Default Re: NEW - PropController Project

    Quote Originally Posted by budude View Post
    Is there something unique/better/different about Greg's dimming code versus how say a Renard works?
    It's written for the Propeller, and I've got some nifty expansions like patching and dimmer curves for it...beyond that I don't think so.

    BTW I was thinking about writing code to clone the renard, not sure if it would be worth it.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  7. #27
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    Default Re: NEW - PropController Project

    OK - was just wondering - I recall seeing a video of a different style of dimming where it broke up the entire dimming cycle into different on/off cycles instead of how most dimmers work where's it's simply completely on or off for whatever percentage. The end result was still the same overall on/off time but it was done throughout the cycle. It was supposed to create much smoother dimming but I didn't see it actually dimming lights - just the scope output from the controller so can't say for sure how well it actually worked. Anyway - not vital - just curious...
    [COLOR=#000080][B][I]Brian[/I][/B][/COLOR]

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  8. #28
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    Default Re: NEW - PropController Project

    Quote Originally Posted by budude View Post
    OK - was just wondering - I recall seeing a video of a different style of dimming where it broke up the entire dimming cycle into different on/off cycles instead of how most dimmers work where's it's simply completely on or off for whatever percentage. The end result was still the same overall on/off time but it was done throughout the cycle. It was supposed to create much smoother dimming but I didn't see it actually dimming lights - just the scope output from the controller so can't say for sure how well it actually worked. Anyway - not vital - just curious...
    That's sine wave dimming, it keeps the sine-wave intact and allows you to dim just about anything. Very expensive to do well.

    With that said I had thought about doing reverse-phase dimming, which is a lot kinder to filaments especially in cold environments. It also dampens the harmonic distortion on the neutral and EMI. However you need a mosfet instead of an SCR.

    http://www.etcconnect.com/Community/...formation.aspx
    http://www.tvtechnology.com/article/12058
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  9. #29
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    Default Re: NEW - PropController Project

    USB connectors arrived today and everything tested out fine for all there USB interface. That means the board appears to be 100% with no mods. Now I can start building the wiki and start tossing code out there.
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

  10. #30
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    Default Re: NEW - PropController Project

    Just in case you wanted to see the before and after. I solder the entire thing at my bench at home with no special equipment.
    Attached Images Attached Images
    DMX, RDM, ArtNet, sACN, and RDMnet...the future of DIY Christmas.
    Designer of the PropController an open source single-board hardware platform designed for lighting and prop control.

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