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Thread: Finally Affortable Snowfall Tubes (FAST)

  1. #21
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Ok here is the first fully populated FAST circuit. 1-PIC16F688, 1-14Pin Socket, 8-Resistors (16 in these pictures because i didn't have any 51Ohm Resistors so i doubled up on 100Ohm), 56-LEDs...

    FAST4.jpg
    FAST5.jpg
    FAST6.jpg
    FAST7.jpg



    <--- Video of FAST running. Uploaded at 4:15pm EST Vimeo will be converting for the next 30 minutes.

  2. #22
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    great work!!
    Video looks good!
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  3. #23
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Quote Originally Posted by Aurbo99 View Post
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  4. #24
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Very nice - - the epitome of DIY - especially using some hacked plastic from an old TV screen! Great Job!

    The only concern I would have is something djulien touched on earlier - as I recall the 16F688 is rated for a total of 90mA for all I/Os. What is the current for the LEDs?
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  5. #25
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    They're charlie-plexed, only one of them is ever on at a time, I recall him in chat saying he was running them at less than 20mA each.
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  6. #26
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Quote Originally Posted by chilloutdocdoc View Post
    They're charlie-plexed, only one of them is ever on at a time, I recall him in chat saying he was running them at less than 20mA each.
    You can have more than one on at a time with charlie-plexing - at least 7 that I can see...?
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  7. #27
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    You are correct I could have 7 on at one time. However the firmware is written that only one is ever on at one time.. Plus as Josh stated I didn't have 51Ohm resistors so I originally used 100Ohm which left the LED's running at 9.5ma.. and still plenty bright enough..

    wwwgator - If you look at the firmware it tells you what pins are that I used and the order that they fire.. So below the first LED to fire would be Pin3 to Pin13.. If you follow the colored diagram it's exactly how i wired it.. and once you kind of look at how it's done it's really kind of easy.

    ;1 = RA4 (Pin3)
    ;2 = RA0 (Pin13)
    ;3 = RA1 (Pin12)
    ;4 = RA2 (Pin11)
    ;5 = RC0 (Pin10)
    ;6 = RC1 (Pin9)
    ;7 = RC2 (Pin8)
    ;8 = RC3 (Pin7)
    ;
    ;1-2 Done;1-3 Done;1-4 Done;1-5 Done;1-6 Done;1-7 Done;1-8 Done
    ;2-3 Done;2-4 Done;2-5 Done;2-6 Done;2-7 Done;2-8 Done
    ;3-4 Done;3-5 Done;3-6 Done;3-7 Done;3-8 Done
    ;4-5 Done;4-6 Done;4-7 Done;4-8 Done
    ;5-6 Done;5-7 Done;5-8 Done
    ;6-7 Done;6-8 Done
    ;7-8 Done

  8. #28
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Great job. I am impressed. I'm thinking, maybe next year I will make some. This year budget is already spent, and then some.
    Really nice job.
    Oh and thanks for the video. That really shows how well it works.
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  9. #29
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Quote Originally Posted by chelmuth View Post
    IIdeally I'd like to get it to a point where there are a few configurable options in the firmware such as setting a flag for maybe a "dimming tail" or other ideas. I'd like some input on the software and if possible some help with the code. I'm 1 week into learning assembly, so I know I've got a ways to go.
    Corey:

    And I absolutely stink at ASM, so I can't be of much help to you there.

    I've just spent some time at YT and V looking at videos of snowfall tubes and what I find different about yours is that you're lighting only one pair of LEDs at a time, while most of the others light a larger swath of LEDs.

    Also, other tubes seem to ramp-up to full on and then ramp down to off the swaths as they descend; is this the "dimming tail" you mentioned above?

    Lastly, yours seem to be rather slow compared to others that are out there.

    I think I'd want to build these as only 12- or 14-inches long ... would there be a provision to have a shorter length?

    Thanks so much for taking the time and energy to work on this.

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  10. #30
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    Default Re: Finally Affortable Snowfall Tubes (FAST)

    Just a change in the delay routing could make it faster.. currently i have it set to decay so that it falls slower as it gets lower. I had a discussion yesterday that someone thought it should go faster.. I could probably put a setting in there that if you put a 1 in before compiling it would speed up or a 0 would make it slow.. those are kind of the configurable options i was looking for having.. If you wanted shorter yeah you could make it shorter length.... just use less pins and remove the un-used pins from the code..also this was my first attempt and I could probably make it about 5" shorter just by having the LED's closer together also.. It's completely possible. I had just planned on around 24" as I was going to cut the tubes mentioned earlier in half (4') or quarters (8').. Yes the dimming tail was what i was refering to as far as the ramp-up you mention. That would require a re-write of the code that I'm not quite up to that skill level yet. It needs to have some sort of software PWM implemented and I have yet to find a good example that I've been able to hack apart and put into that and I'm not completely comfortable with the interrupt routines which would be required. Which is why i was hoping someone with a little more coding experience could help with. I was just laying the ground work and idea for innexpensive tubes. Currently they should be less than 10$ per tube.. yes they require some work but that's the fun part.

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