LED sequencer
LED sequencer
(OP)
I'm searching for a circuit that would turn on the LEDs in an LED array one at a time. For example, if the LEDs were lined up in a line, the LEDs would light up from left to right or right to left or whatever the order may be. It would be nice if circuit allowed it so that the lighting speed would be adjustable.
Do any of you know of such a circuit that is viewable on the web?
I was going to program a cheap microprocessor to turn on each LED in sequence, but I figured that there might not be enough outputs to control all the LEDs. Not to mention the costs might be higher than needed to make this project work.
Do any of you know of such a circuit that is viewable on the web?
I was going to program a cheap microprocessor to turn on each LED in sequence, but I figured that there might not be enough outputs to control all the LEDs. Not to mention the costs might be higher than needed to make this project work.





RE: LED sequencer
Gunnar Englund
www.gke.org
RE: LED sequencer
Never had the need to do something like this but seems feasible unless you have a 100 LEDs.
RE: LED sequencer
RE: LED sequencer
RE: LED sequencer
Google: "Knight Rider" LED sequencer
There are plenty of circuits on the WWW for 'back and forth' LED sequencers. Some circuits should be adaptable in case your requirements are slightly different.
RE: LED sequencer
RE: LED sequencer
"Take a look at the 4017. It is called a ring counter, and it can be expanded to infinity."
No it can't. If you use 2 4017's, for instance, two LEDs would light at the same time, so you have a 2x10 sequence, not a 1x20.
Benta.
RE: LED sequencer
There's an app note in the Solid State Scientific 400 series cmos logic databook 1984.
I was looking at this for a different application last week.
RE: LED sequencer
Gunnar Englund
www.gke.org
RE: LED sequencer
Yes, good catch, s/b 256. Spell check won't catch that kind of goof.
Not German, an American living in Santa Barbara California.
RE: LED sequencer
Gunnar Englund
www.gke.org
RE: LED sequencer
RE: LED sequencer
I have done ciruits with daisychained 4017s that could expand to infinity. There was a carry bit that enabled this expansion. But anyway the part is obsolete.