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how to get led's to scan

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justinwebb

Joined: Sep 15 2004
Posts: 3170
Location: Columbus, OH


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Post Sun Mar 12, 2006 2:24 pm

i am working on a project and i need the led's to scan in one direction like so


O O O O O O O O O O O
>>>>>>>>>>>>>>>

O=LED
> = direction i want it to scan then start over at the 1st led

and i also need something that scans slowly or something that i can change the speed of?

i bow down to the all mighty led gods in hopes of an answer
Ryan88

Joined: Aug 09 2004
Posts: 3516
Location: Pittsburgh, PA


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Post Sun Mar 12, 2006 2:32 pm

I'm no expert but I know you would need to use a 555 Timer and a potentiometer to control the speed.
A-Ray

Joined: May 01 2005
Posts: 4062
Location: Volunteer State


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Post Sun Mar 12, 2006 2:53 pm

you need the microprocessor that (insert name here) created.
jethawk

Joined: Jul 07 2004
Posts: 1242
Location: Windsor, Ontario, Canada


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Post Sun Mar 12, 2006 6:02 pm

scan as in light up one at a time as they go across... or scan as in... first led lights up...stays on..2nd lights up stays on...etc etc.. so basically building up?
Silentdawn

Joined: Apr 12 2005
Posts: 1481
Location: Hockessin, Delaware


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Post Sun Mar 12, 2006 6:02 pm

relays?
jethawk

Joined: Jul 07 2004
Posts: 1242
Location: Windsor, Ontario, Canada


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Post Sun Mar 12, 2006 6:06 pm

people are on the right track with the 555 timer...your gonna need one of those.. and a 4017 if you just want one at a time... if you want them to "build up"... then your going to have to add in some SCR's into the circuit... oh and to varry the speed its just throwing in a potentiometer on pin 3 and 6 on the 555 timer...
kornholio788

Joined: May 02 2005
Posts: 9748
Location: Tosa, WI


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Post Thu Mar 16, 2006 9:18 pm

Ummmm meteors would make it easy and u can choose other patterns IDK
nicku1302

Joined: May 07 2006
Posts: 1


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Post Sun May 07, 2006 7:47 pm

I have created the above scanning pattern you described above by using a microcontroller and writing code for it. I have also created code to make the LED's seem as they are bouncing off eachother, start in the middle and light up in an outwards pattern and many more. The easiest way to accomplish this is by using a micro. It also give you more potential than a 555 timer and 4017.
BuryTheNeedle

Joined: Apr 21 2006
Posts: 72
Location: Rhode Island


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Post Sun May 07, 2006 8:43 pm

funny story that happened today
I acidently kneeled on a cmos 555ic today and the pins imbedded through my pants into my knee, those things are strong!
TechSys

Joined: Mar 21 2003
Posts: 288
Location: Jacksonville, Florida


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Post Mon May 08, 2006 9:29 am

Quasar Electronics Kit #1088 : Knight Rider LED scanner

and now for the link to the PDF file.



Hope that helps.
SOHCKing03

Joined: Jul 10 2006
Posts: 11
Location: Canton, MI


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Post Tue Aug 08, 2006 9:26 am

http://forums.2gss.org/index.php?showtopic=10812&hl=

check out that topic... I posted it asking the same question and I got some help.

But basically the best thing to read is this...

http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm

Look at the diagram of "Expandable 16 Stage LED Sequencer"
justin

Joined: Jan 15 2004
Posts: 5061
Location: Madison


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Post Tue Aug 08, 2006 11:15 am

ack that kit looks promising but at prolly $50usd shipped omfg expensive!

the set of green led bars i got from autozone work real nice, can be made to work outdoors, and can either be solid, or scan... $30. dunno if they still make em.
TheBrick

Joined: Oct 07 2003
Posts: 4140
Location: Niagara Falls, Canada


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Post Wed Aug 09, 2006 4:56 pm

listen to Jethawk he knows his ****. Ive seen what he can do and its awesome.
SOHCKing03

Joined: Jul 10 2006
Posts: 11
Location: Canton, MI


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Post Wed Aug 09, 2006 7:25 pm

i agree that you should listen to jethawk...

but i just gave you a whole diagram you could copy...

it shows how to wire the 555 timer, leds, transistors, potentiometer...

just check out that site and itll give you EVERYTHING...

you can also email me or pm me if you need more help, ive created my own schematic adjusted to wire into a 12V source...

-Brad
justin

Joined: Jan 15 2004
Posts: 5061
Location: Madison


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Post Fri Aug 11, 2006 5:35 pm

just stumbled upon this:


looks promising.
dyldo

Joined: Aug 26 2006
Posts: 86
Location: australia


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Post Mon Oct 02, 2006 4:29 pm

Quote:
a microcontroller and writing code for it.
where would i buy one of these in australia and would i be abled to program this to make several patterns
Cooper

Joined: Mar 19 2006
Posts: 1770


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Post Mon Oct 02, 2006 8:07 pm

nicku1302 wrote:
I have created the above scanning pattern you described above by using a microcontroller and writing code for it. I have also created code to make the LED's seem as they are bouncing off eachother, start in the middle and light up in an outwards pattern and many more. The easiest way to accomplish this is by using a micro. It also give you more potential than a 555 timer and 4017.


How do you program the micro controller ? Some kind of PC interface ? Where did you buy all this stuff ?
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