This LED sequence

[XalaX]

Hi,
i'm a newbie of this forum. I don't understand so much about electronics but i'm good in building my own circuits from projects.

I would like to have help in making this kind of led sequence.
If you can post me some scheme or project or link, please.

The circuit has to turn on and off about 20 leds in this way:

00000000000000000000
00000000000000000001
00000000000000000011
00000000000000000111
00000000000000001111
and so on...
11111111111111111111
01111111111111111111
00111111111111111111
and so on...
00000000000000001111
00000000000000000111
00000000000000000011
00000000000000000001

Thank you for helping me.

Kind regards

PS forgive my bad english, i'm from sicily

 

[(*steve*)]

have a look at the LM3914. One of the circuits in the datasheet does just this (if I recall correctly)

 

[XalaX]

thank you steve.
here's the ic's datasheet http://cache.national.com/ds/LM/LM3914.pdf

can you show me the right application that i need?

regards

 

[(*steve*)]

See pages 9 and 15

 

[XalaX]

thank you!!!
steve you saved me!!!!