Need to generate sequence 001, 010, 100, 001, 010, 100, ...

[[email protected]]

I am looking for the simplest collection of logic chips that would
produce the sequence 001, 010, 100, 001, 010, 100, ...

I know that a PIC could be programemd to do this.

Any help would be greatly appreciated. Thanks

 

[Eeyore]

I am looking for the simplest collection of logic chips that would
produce the sequence 001, 010, 100, 001, 010, 100, ...

I know that a PIC could be programemd to do this.

Yes a PIC.

Graham

 

[James Beck]

Yes a PIC.

Graham

Yep, one of the little 8 pin jobs could do it with no external parts,
short of a decoupling cap.

 

[JeffM]

jalbers@ bsu.edu wrote

A 4000-series 4017 decade counter could be configured to do this.

What grade do you expect you'll get
from his instructor at Ball State University?

 

[Varactor]

I am looking for the simplest collection of logic chips that would
produce the sequence 001, 010, 100, 001, 010, 100, ...

I know that a PIC could be programemd to do this.

Any help would be greatly appreciated.  Thanks

A simple shift register and the output changes with the clock input.
How you clock it is up to you. The last bit is wired back to the first
data in...

Cheers

 

[Rich Grise]

Yes a PIC.

You're not allowed to say "use a pic" without providing a schematic
and full code listing.

My first thought was a 3-bit shift register.

Cheers!
Rich

 

[Eeyore]

You're not allowed to say "use a pic" without providing a schematic
and full code listing.

OK, use an '8051' then. 63 cents indicative price for this one. I don't
do PIC code but I could ask my nephew to do that !.
http://www.nxp.com/pip/P89LPC901_902_903-05.html

My first thought was a 3-bit shift register.

Far too many parts !

Graham

 

[Eeyore]

Oh, OK. A counter with auto-reset is the answer then.

Graham

 

[James Beck]

Oh, OK. A counter with auto-reset is the answer then.

Graham

A PIC isn't a logic chip?
It might not be a "discrete" logic chip, but I'm pretty sure there is
some kinda' logic in there.

 

[James Beck]

The OP stated :
"I know that a PIC could be programemd to do this."
Is that a rejection?

Naturally, the info provided doesn't really give us the full domain of
the problem, and I'm just yanking your chain.......

Jim

 

[Eeyore]

You still need a clock source of course. The 89LPC901 can do the lot.

Graham

 

[Jamie]

A PIC isn't a logic chip?
It might not be a "discrete" logic chip, but I'm pretty sure there is
some kinda' logic in there.

Yes, that sounds logical!


--
"I'd rather have a bottle in front of me than a frontal lobotomy"

"Daily Thought:

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING BUT
THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS.
http://webpages.charter.net/jamie_5"

 

[Clint Sharp]

More specifically, a 4017, which is one chip less than shown in my
earlier post.

Spot on, clock source? Personally if I was using a 4017 I'd have to use
a 555 but that's because they were the very first chips I bought as
separate components and I'm a sentimental git. (I saved for months for a
Radio Shack 200 in 1 electronics lab which had a couple of TTL chips
before I discovered the delights of solder and stripboard at the tender
age of 12)