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Thread: dirkcheap acssr for dc?

  1. #11
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    Default Re: dirkcheap acssr for dc?

    Quote Originally Posted by dkulp View Post
    Probably a smaller form factor and hopefully cheaper DC SSR. My "hack" to the dirk cheaps uses a transistor, but that requires customer firmwares on the controllers and also doesn't provide any isolation. I was thinking of trying to experiment with sticking an opto-fet or opto-transitor. Either option would use roughly the same form factor of the DiskCheap. Obviously a much lower current that the full DC SSR (likely around .4A per channel looking at some of the specs), but for a lot of applications, that's probably enough.
    I haven't seen where isolation has been that important for DC controllers - - there are 300+ Ren48LSD's out there representing over 14,000 channels and have never seen a case where the high load power somehow got back through the PIC, back through the RS485 chips and back to the PC - ever. It would be easy to just recreate the output portion of the Ren48LSD - it would still require the flipped outputs, etc as you do today if using a Renard non-SSR controller or even with an Arduino type output. Breadboard out with some cheap transistors and 470 ohm resistors - done...
    [COLOR=#000080][B][I]Brian[/I][/B][/COLOR]

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  2. #12
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    Default Re: dirkcheap acssr for dc?

    I may be thinking a bit too logically (literally, I'm thinking logic gates), but I also had a thought of using a hex inverter (I haven't seen a quad inverter) to flip from sink to source to then drive 4 transistors. However, that would require board space for 4 transistors, 8 resistors, and a 14 pin chip. Might start getting a bit bigger. Not really sure if the inverter thing would work either. Something to breadboard up and experiment with.
    Dan Kulp

  3. #13
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    Default Re: dirkcheap acssr for dc?

    Quote Originally Posted by dkulp View Post
    I may be thinking a bit too logically (literally, I'm thinking logic gates), but I also had a thought of using a hex inverter (I haven't seen a quad inverter) to flip from sink to source to then drive 4 transistors. However, that would require board space for 4 transistors, 8 resistors, and a 14 pin chip. Might start getting a bit bigger. Not really sure if the inverter thing would work either. Something to breadboard up and experiment with.
    FYI: The PIC code has the ability to output its signals using active high or active low modes. Leave out the inverter and change the PIC.


    2019 - Just moved into a new home (yet another change of plans). Will be dim but not dark. Too much to do at the new place to leave time for a show.
    https://www.youtube.com/channel/UCyX...ttrsZNARkUce0Q

  4. #14
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    Default Re: dirkcheap acssr for dc?

    Quote Originally Posted by dkulp View Post
    I may be thinking a bit too logically (literally, I'm thinking logic gates), but I also had a thought of using a hex inverter (I haven't seen a quad inverter) to flip from sink to source to then drive 4 transistors. However, that would require board space for 4 transistors, 8 resistors, and a 14 pin chip. Might start getting a bit bigger. Not really sure if the inverter thing would work either. Something to breadboard up and experiment with.
    You only need four resistors to limit the current to the transistors from the PIC so the circuit could be quite small - smaller than the current dirkcheap AC board for sure.
    [COLOR=#000080][B][I]Brian[/I][/B][/COLOR]

    [COLOR=#ff0000]Christmas in San Jose! - [URL="http://www.christmasinsj.com"]WEB[/URL] - [URL="https://www.facebook.com/ChristmasInSanJose"]FB[/URL] - [URL="https://www.youtube.com/playlist?list=PL1W78s7liEQEE0ed7WSyLF7B6j3lBX43w"]VIDEOS[/URL]
    [/COLOR][COLOR=#800080]Halloween in San Jose! - [URL="https://www.facebook.com/pages/Halloween-in-San-Jose/356280784428581?ref=tn_tnmn"]FB[/URL]
    [SIZE=1]2015 Halloween Show - Planning now - hopefully some house projection...
    2015 Christmas Show - 5x E681-12, 1x 6804, Ren48LSD, 3x RenSS16, 1x Falcon16v2 (w/expander), 24x90 WS2811 pixel MT (James MT Strips), 12x DIYC Floods, SuperPixelStar, 3x Pixel Arches, PixaBulb House outline
    [/SIZE]
    [/COLOR][SIZE=3][COLOR=#008000][I]Ignorance is Temporary [/I][/COLOR][COLOR=#800080][I]- [/I][/COLOR][COLOR=#ff0000][I]Stupidity is Forever[/I][/COLOR][COLOR=#800080][I]...[/I][/COLOR][/SIZE][I][COLOR=#ff0000]
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  5. #15
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    Default Re: dirkcheap acssr for dc?

    Yea, if you look at my pictures and the description and such from my thread at:
    http://www.diychristmas.org/vb1/show...ighlight=dcssr

    that's what I did. However, I'd like to have a solution that doesn't require custom firmware changes. With the RenardPlus boards with the programming headers, it's not a huge deal, but it is a bit more involved with the other boards. Plus, you then need to remember (or record) which channels are source and which are sync and such.
    Dan Kulp

  6. #16
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    Default Re: dirkcheap acssr for dc?

    I have a version of the renard PIC code that allows you to change the active high/low setting per channel at run time (download a configuration to the pic over the RS485 interface). Happy to give it to you.


    2019 - Just moved into a new home (yet another change of plans). Will be dim but not dark. Too much to do at the new place to leave time for a show.
    https://www.youtube.com/channel/UCyX...ttrsZNARkUce0Q

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