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Old 10-18-2007, 07:11 AM   #15
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I'm curious- is that a real-time light show or are most of the effects done in editing the video?

Either way, it's a hoot!
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Old 10-18-2007, 07:59 AM   #16
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Quote:
Originally Posted by Wayne&Sam
I'm curious- is that a real-time light show or are most of the effects done in editing the video?

Either way, it's a hoot!
Thanks eveyone for the nice comments.

This was a real time light show done for a New England Unit rally.

Some technical details:

I designed an electronic sequencer that addresses six 8 bit EPROMS to allow the control of 48 optically isolated AC channels. It is a simple 11 bit up counter that addresses the EPROMS clocked with a 19.85 Hz oscillator. The sequencer actually runs asynchronously with the music, I just detect the first note of the music to start the sequence,and it runs independently from there. I was lucky that the music, "Wizards in Winter" maintains a single steady tempo. I was sweating that out for a while.

The tough part was coming up with timing diagrams for the light choreography. Luckily, TSO has the sheet music for this piece on their website. I wrote the timing diagrams like a musical score on staff paper which made it easier to compare to the sheet music and synchronize. The timing "score" was then translated to EPROM data.

Most of the parts are just surplus, old technology through hole TTL. I wire wrapped the circuit board, and patched together a variety of surplus cables.

It was just a fun project, a better way to spend evenings than watching sitcom re-runs.

Keith
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Old 10-18-2007, 08:56 AM   #17
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Quote:
Originally Posted by LoydBonifide
I am an electrical engineer by trade, but I started college as a music major.
No kidding?? I didn't know that.
The wife and I both started college as music majors. (finished as music majors, too )
now, I'm a network engineer by trade. you know what they say: "don't quit yer day job!".

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{backup-camera man, extraordinaire....}
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Old 10-18-2007, 09:09 AM   #18
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Quote:
Originally Posted by Chuck
No kidding?? I didn't know that.
The wife and I both started college as music majors. (finished as music majors, too )
now, I'm a network engineer by trade. you know what they say: "don't quit yer day job!".

-Chuck
{backup-camera man, extraordinaire....}
My parents started me on trombone lessons in third grade, they wanted me to be the next Glenn Miller or Tommy Dorsey. But in my second year of a music education major major, I started student teaching in a broken down grade school in Oklahoma, and I decided I better find a different vocation.

I also needed to pass a piano proficency test, but I was a hopeless case.
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Old 10-18-2007, 02:14 PM   #19
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Quote:
Originally Posted by bobandcarla
Great light show! Wish we had seen it in person. Can't wait to meet you. Lots of good karma! We are close to you in Pelham.
Hi Bob and Carla,

Thanks for the karma, I need all I can get.

I used to drive through Pelham often on my way back from U Lowell night school.

NEU has scheduled "Aluminations Revisited" rally for the middle of September 08 at the Rochester Fairgrounds. I will certainly bring the show there! The first Aluminations was great, and inspired me to do this project.

Keith
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Old 10-18-2007, 05:03 PM   #20
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Big Huge Karma Rivets To You! You just made my last few minutes at work!

Thanks and Rock On!


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Old 10-18-2007, 09:19 PM   #21
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Quote:
Originally Posted by LoydBonifide
Some technical details:

I designed an electronic sequencer that addresses six 8 bit EPROMS to allow the control of 48 optically isolated AC channels. It is a simple 11 bit up counter that addresses the EPROMS clocked with a 19.85 Hz oscillator. The sequencer actually runs asynchronously with the music, I just detect the first note of the music to start the sequence,and it runs independently from there. I was lucky that the music, "Wizards in Winter" maintains a single steady tempo. I was sweating that out for a while.

The tough part was coming up with timing diagrams for the light choreography. Luckily, TSO has the sheet music for this piece on their website. I wrote the timing diagrams like a musical score on staff paper which made it easier to compare to the sheet music and synchronize. The timing "score" was then translated to EPROM data.

Most of the parts are just surplus, old technology through hole TTL. I wire wrapped the circuit board, and patched together a variety of surplus cables.
Huh? What did he say?

All I know is I will never forget this light show, it was MAGIC!!!!!!
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Old 10-18-2007, 09:43 PM   #22
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Thumbs up

Kewl..
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Old 10-18-2007, 09:44 PM   #23
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Quote:
Originally Posted by myboyburt
Huh? What did he say?
Myboyburt, it's a simple 11 bit up counter that addresses the EPROMS clocked with a 19.85 Hz oscillator (not a 19.75 like we all thought).
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Old 10-18-2007, 09:55 PM   #24
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Quote:
Originally Posted by mistral blue
Myboyburt, it's a simple 11 bit up counter that addresses the EPROMS clocked with a 19.85 Hz oscillator (not a 19.75 like we all thought).
Right, I'm sure that's it.
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Old 10-19-2007, 04:51 AM   #25
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Glad to know I wasn't the only guy pretending to understand... what I do understand is that was very cool.
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Old 10-19-2007, 05:20 AM   #26
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Gosh,
SURPLUS??
I can remember when TTL were used in everything~!
Still, I was extremely impressed.
Sept, 2k8 is a must do for sure~!!
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Old 10-19-2007, 06:18 AM   #27
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Wow!--Is what our airstreams do when we're not watching?--The secret lives of airstreams---yummy!!
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Old 10-19-2007, 08:20 AM   #28
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What a great display! Sure beats my rope lights.

Tom
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