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Ponddude

LED Chaser build...HELP!

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I have posted this on several different forums including all the DIY forums, but no ones seems to have much interest in helping me. I even posted this on a few electronics forums...still to no avail. I am hoping the DIY community here can help me...

I am trying to create or purchase an LED chaser circuit that chases 10 LEDs. I want have two of the LEDs on at once and have them chase in one direction. I would also like to control the speed of the chase.

I should also tell you that each of the 10 "channels" will have 3 white LEDs and I want to run it on 12v.

Like I said, I could built my own, but does anyone know of a place where I could purchase a pre made PCB? If not, I have no problem making my own.

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Like I said, I could built my own, but does anyone know of a place where I could purchase a pre made PCB? If not, I have no problem making my own.

Greg,

I you build your own, please PM me as I would like to know how. I want to make a smaller version (3-4 channel) for roof chasers.

Thanks,

Dan

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By "two LED's at once" do you mean that you'd want the following sequence:

12, 23, 34, 45, etc (where the number means the LED is on)?

I've never seen a pre-made kit like that but it would be pretty trivial to build with a microcontroller circuit. You'd just have to have a micro with 10 outputs that you could sink the power of 10 LED's with, and a trivial bit of code...

That said, I can't do it for you, since I'm not set up to do Micro work anymore. I used to dabble with Atmel micros but not anymore... But I'm sure there's someone else here who could help you out -- from what little I understand of Micro circuits this should be trivial.

-Tim

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but it would be pretty trivial to build with a microcontroller circuit. You'd just have to have a micro with 10 outputs that you could sink the power of 10 LED's with, and a trivial bit of code...

Trivial for you maybe, and possibly Toymaker also, but it sounds difficult and expensive to me. I would be curious as to how one is built if anyone attempts it.

That said, I can't do it for you, since I'm not set up to do Micro work anymore.

I could lend you my wife's "Red Hammer"...

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Trivial for you maybe, and possibly Toymaker also, but it sounds difficult and expensive to me. I would be curious as to how one is built if anyone attempts it.

Yeah, by "trivial" I meant "trivial for anyone who knows how to deal with micro-based circuits".

As for 'expensive', depends on what you call expensive... Micro's are dirt cheap these days, and there would be minimal additional components needed just to drive LED's... My WAG estimate would be $30, probably less (component cost only -- no idea what someone would charge to do this for you. Knowing the PC community, someone might do it gratis...)

-Tim

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This where I got all my info/help for making the led taillights and controllers for my car. I ended up using one controller for the tail/turn/break that has 8-10 selectable patterns and I also used an 8 channel controller to do chase patterns in each taillight.

http://www.hidplanet.com/forums/

Click on the LED section

Also check out www.able2products.com They are the makers of my show-me controller. I don't remember who made the other. maybe them. I have a crude diagram of the box that I wired to integrate everything. One controller is positive ground, the other negative. Everything is 12v, so you will need a wall wart/batterie to power them. I made a pulse width modulator to vary the intensity of the leds, also.

Anyway, good luck. I am no expert, but I will try to answer any other questions you have

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One way to do it without micros is to modify the venerable 555/4017 chase circuit which you can find everywhere on the web. Instead of driving each LED from one output of the 4017, you drive it from two adjacent outputs, using diodes (e.g. 1N4148) between each LED and the two outputs that it's connected to.

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Last year i started constructing/building a 12 channel chasing LED controller.

I want to use it to strobe 12 small boxes with 4 pcs. 0.5w 10mm LED's each.

I use the construction here http://picprojects.org.uk/projects/ledchaser/ to start with and have added a powertransistor to each output because of the high power used by the LED's

I bought 50 LED's here http://cgi.ebay.com/50p-10mm-HP-0-5W-MULTI-Chip-White-LED-280Kmcd-FREE-SHIP_W0QQitemZ350172775199QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item350172775199&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50

Guess it would be simple to modify the code for the pic for your needs.

/Kim

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