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Eyes

maplesyrup's Story Made Me Wonder...

I wonder if there's an LED marquee board designed for the rear windshield. :)  I would run messages like:

NICE DAY, ISN'T IT? :D

TUNE INTO MY FM XMITTER AT xx.xMHZ IF YOU WANT SOME KOREAN MUSIC! :D

CHIRP IF YOUR PROGRAM SEGFAULTED TODAY! XD XD

YOU CAN STOP HIGHBEAMING ME 'CAUSE IT WON'T DO JACKSHIT TO ME AND MY ELECTRO-CHROMATIC REARVIEW MIRROR.

Edit: Things for my own reference:

Comments

Something like that ought to be pretty easy to put together. Only problem is that you will undoubtedly have more LEDs than you will GPIOs on any given proc, so you'll need to figure out what will drive the LEDs and how to interface it to the proc.

Mind, I'm not sure I would want anyone listening to my FM xmitter. Greater incentive to tail me. :)

Actually I don't really need that many pins if I exploit persistence of vision...  I can horizontally scan through columns of LEDs, just like a dot matrix printer would.  <3

I actually have wondered this myself... Like you would be able to control it using a screen (if your car has a touch screen, you could use that).

Mine would say

"If you're going to be on my ass, at least pull my hair!"
"Good driving jackass!"
"Breakcheck!"

I'm such an asshole. XD
but at least you're a lovable asshole <3
haha you better know it.
Mine would so say the same things. I'd have to have one for the front too that makes it ledgible from the rearview mirror of the jackass in front of me that doesn't know how to drive in the fast lane.
I've done some research on this myself, but I don't know if it's legal to have additional lights coming off the back of your car.
Mom is really bugging me right now to see if I can find any Korean music so I can make a cd for her friend... problem is her friend is almost 80 years old... got anything you think an 80 year old Korean woman would like?

Man, even I would have a hard time finding MP3s from 50s to 70s... _-_

X'D I told mom to get me some artist names. I honestly haven't listened to any of the Korean music you've supplied us with, she might like some of it, you never know :X.
I'd run:

I'M BACKING UP NOW
YOU WOULDN'T BELIEVE WHAT ELSE I DID TO THIS CAR
HANG ON WHILE THIS HOOKER FINISHES ME OFF

and so forth.