Chasing LEDs question

Greetings All,
I would like visual indication of the position of a remote motor
shaft. The way I've already done it is to use the shaft encoder
signals with an IC that outputs step and direction pulses. I then use
these signals with associated circuitry to drive a stepper motor
mounted pointer. This works OK but I'm thinkling that 100 LEDs in a
circle might work better. Can anyone here point me in the right
direction to find the devices needed for this?
Thanks,
Eric

 

[Jamie]

etpm@whidbey.com wrote:

Greetings All,
I would like visual indication of the position of a remote motor
shaft. The way I've already done it is to use the shaft encoder
signals with an IC that outputs step and direction pulses. I then use
these signals with associated circuitry to drive a stepper motor
mounted pointer. This works OK but I'm thinkling that 100 LEDs in a
circle might work better. Can anyone here point me in the right
direction to find the devices needed for this?
Thanks,
Eric
How about a gray code encoder ?

http://en.wikipedia.org/wiki/Gray_code

http://webpages.charter.net/jamie_5"

 

[Jasen Betts]

On 2009-01-15, etpm@whidbey.com <etpm@whidbey.com> wrote:

Greetings All,
I would like visual indication of the position of a remote motor
shaft. The way I've already done it is to use the shaft encoder
signals with an IC that outputs step and direction pulses. I then use
these signals with associated circuitry to drive a stepper motor
mounted pointer. This works OK but I'm thinkling that 100 LEDs in a
circle might work better. Can anyone here point me in the right
direction to find the devices needed for this?
Thanks,
Eric

two cascaded reversible decade counters driving 100 matrixed LEDs.

2x 4510 reversible BCD counter
2x 4028 BCD to 1-of-10 decoder
2x 4069 hex inverters (10 of the 12 inverters used)
10x resistors to limit LED current
whatever logic needed to control up/down and clocking
100 LEDs matrixed 10x10 (but arranged in a ring)

 

[Bill Bowden]

On Jan 15, 7:20 am, e...@whidbey.com wrote:

Greetings All,
I would like visual indication of the position of a remote motor
shaft. The way I've already done it is to use the shaft encoder
signals with an IC that outputs step and direction pulses. I then use
these signals with associated circuitry to drive a stepper motor
mounted pointer. This works OK but I'm thinkling that 100 LEDs in a
circle might work better. Can anyone here point me in the right
direction to find the devices needed for this?
Thanks,
Eric

Maybe something like this will work. It's shown for 25 LEDs but can be
expanded to 100.

http://ourworld.compuserve.com/homepages/Bill_Bowden/25led.gif

-Bill