On or about 17 Apr 2007 09:38:36 -0700 did "chull13[at]yahoo.com"
<chull13[at]yahoo.com> dribble thusly:

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More like distraction producer. Such brake lights on the road can be
dangerous. The idea is to be noticed, not draw and hold attention.

The change from off to on, or dim to bright, is quite sufficient for
brake lights.
--
- Mike

Ignore the Python in me to send e-mail.

On Tue, 17 Apr 2007, chull13[at]yahoo.com wrote:

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My thought was that persistence of vision would more readily cause the
spinning lights to merge at low light levels. You could use a simple
photoresistor (CdS cell) into the PIC, and sense a few levels. No need for
high resolution!

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Not familiar with the PAK-V, but it sounds intriguing. I'll check it out.
PIC should do fine for you.

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Analog IC timer, first released by Signetics, if memory serves, back in
the early 70's. Still finds tons of hobbyist uses.

Dave

Yup - that was going to be the patteren used for rapid slow down
without braking.
My snowmobile slows down really fast when realeasing the throttle.
But, hey - I'll cut you in one the Royalties! : )

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chull13[at]yahoo.com wrote:

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brake lights is to make them appear to get larger than normal, just as
any object does as it gets closer to you. This would only require that
there be several concentric circles of LEDs which would light up in
sequence from inner to outer, each ring staying lit as subsequent rings
are lit. Probably has been invented, but if not, you saw it here first...

w.stacy, o.d.

Thank you both for the info!
I have read about the 15 pps - but was So Long ago and I saw it only
once or twice it would have Never come to my mond!!
Thanks!!

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off has yet to work. Maybe if we start calling him 'Butt Sniffeer" it
might work as he is So Homophobic!

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and brakeing that also alteternate every 5 seconds or so clock/and
conter clockwise when spped is sort of consitant and no braking.
But, I'm thinking the main Idea out of 12 LEDs in the outer circle
to be two leading LEDs at full brightness, following by two at 1/2 and
two at 1/4.

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Make a difference you think?

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the PAK-V co-processors.
any better way of going?
I am a newbie - But learing!! 555 what?!
have done some programing, NO hardware proto typing but Very well
read and good at finding out.

Thanks!!

On Tue, 17 Apr 2007, chull13[at]yahoo.com wrote:

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Great project idea!

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As Mike Tyner wrote, it depends upon a number of variables. Are you going
to have a single LED lighted at one time, advancing around, or multiple?
To my mind, having roughly half the LEDs hot, turning on a new leader and
off a trailer for each step, you could certainly go to 5 rps, possibly up
to 10, at full speed.

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I would say 10 pps. You might take ambient light into consideration,
slowing both the braking and running rates under low light levels. I'd
guess you're planning on using a microcontroller of some sort (who bothers
with 555's for this sort of thing any more?), so you'd have a lot of
latitude for control and variability.

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If you can get past the ad hominem replies to resident eccentrics, it's a
great place for vision-related information...

Dave

I've been thinking about a strobe (Xenon, not LED!) adjunct for my Miata
airhorns for some time. It's nice that they can hear you, but it's even
better if they can see where you are, as well.

<chull13[at]yahoo.com> wrote

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How many frames per second does it take to make a movie stop flickering? 15?
It varies with illumination, target size, and eccentricity from the line of
sight.

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The upper limit would be 15ish, 5 seems too slow. I like 10.

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Yes.

-MT

Ok - Trying to keep from getting rear ended by 15 y/o tailgater while
snowmobiling.
I'm going to make2 brake/tail lights with 25 superbright LEDs with
each LEDl being fully programable. The two right and left would
display a mirror pattern of the other.
Two things:
For running mode I will be using rotating patterns wherethe rotating
speed of the patterns is tied to speed of the snowmobile.
1. How fast of a rotation rate would become undistinguisable? I would
think much more than 5 rotations per second would be the upper limit?
These will be almost 2 1/2 inches in diamater.
2. Many experts say a rapid plusing is a good attention getter for
braking: How many pulses per second would become ineffective?

Is this a good place to ask these questions? : )
Thanks