Light show (parallel port interfacing)

Insectoid · **Posted:** Mon Jun 09, 2008 10:03 am

I did this for my computer engineering class. I think it was pretty cool.
Put simply, it's an LED light show!

To work this, you need to have an 8 (or more) LED lineup on a breadboard with pins 2-9 into the lights and a ground.

Turing:

var num := 1
var num2 : int := 256
loop
for y : 1 .. 3
num := 1
num2 := 1

for x : 1 .. 8
parallelput (num + num - 1)
num *= 2
delay (75)
end for

for x : 1 .. 8
parallelput (num - num2)
num2 *= 2
delay (75)
end for
parallelput (0)
end for

for y : 1 .. 3
num := 1
num2 := 256
for x : 1 .. 8
parallelput (num)
delay (50)
num *= 2
end for
for x : 1 .. 8
num := round (num / 2)
parallelput (num)
delay (50)
end for
end for

for y : 1 .. 3
num := 1
num2 := 128

for x : 1 .. 4
parallelput (num + num2)
delay (100)
num *= 2
num2 div= 2
end for

for x : 1 .. 4
num div= 2
num2 *= 2
parallelput (num + num2)
delay (100)
end for
end for

for x : 1 .. 10
parallelput (0)
delay (100)
parallelput (255)
delay (100)
end for
for x : 1 .. 8

parallelput (num2 - 1)
num2 := round (num2 / 2)
delay (100)
end for
parallelput (0)
delay (1000)
end loop

death bringer · **Posted:** Tue Jun 10, 2008 2:11 pm

Doesn't work for me....

Aziz · **Posted:** Tue Jun 10, 2008 3:25 pm

Quote:

To work this, you need to have an 8 (or more) LED lineup on a breadboard with pins 2-9 into the lights and a ground.

Do you have an "8 (or more) LED lineup on a breadboard with pins 2-9 into the lights and a ground"? That's why it didn't work.

Insectoid, it'd be cool if you posted the circuit diagram so others can more easily understand what's going on. Just draw it up in paint or something.

Insectoid · **Posted:** Tue Jun 10, 2008 4:33 pm

Well, that would be a good idea. Here you all are!

MihaiG · **Posted:** Tue Jun 10, 2008 4:46 pm

im doing somethign similar for my ISU,
but i uses 8 leds, and a wand that moves back and worth really fast, and you can enter text in and it will display it in the air due to persistence of vision, seems nifty as a demo,
cool stuff

Insectoid · **Posted:** Tue Jun 10, 2008 4:51 pm

Sweet! you can buy those in the store, but if you can make it yourself, huzzah!

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