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

 

Welcome to the forums. Your English is very good.

One of our members has been working with 555 timers and LED's for some time. You might get some tips from his article - http://forum.allaboutcircuits.com/showthread.php?t=19075

My take on your circuit would be to use a bidirectional shift register - actually 5 of them (74LS194). You would also need additional external logic to make the last bit 0 when then maximum count of 20 was reached.

And then maybe someone else will have a better idea.

 

thank you!
it's time to work for me now