I need to turn on ten LEDs one by one in the below fashion.

GOING UP
==============
0. No LED will light up
1. First LED will light up
2. 1st and 2nd LED will light up
3. 1st, 2nd and 3rd LED will light up
etc
10. All the LEDs will light up

GOING DOWN
==============
11. Then 9 LEDs will light up
12. 8 LEDs will light up
etc
20. First LED will light up
21. No LED will light up

The process continues.

Which IC is used for this circuit? How to wire it?

 

I need to turn on ten LEDs one by one in the below fashion.

GOING UP
==============
0. No LED will light up
1. First LED will light up
2. 1st and 2nd LED will light up
3. 1st, 2nd and 3rd LED will light up
etc
10. All the LEDs will light up

GOING DOWN
==============
11. Then 9 LEDs will light up
12. 8 LEDs will light up
etc
20. First LED will light up
21. No LED will light up

The process continues.

Which IC is used for this circuit? How to wire it?

I think you are looking for an LM3914 but you will need a rising/falling analogue voltage to create the progressive LED effect. Alternatively you could program a micro or use something like an Arduino.

 

you need a knight rider vu meter, you can substitute the sawtooth osc for a 555 timer.


http://www.bit-tech.net/modding/2002/06/22/knight_rider/2

 

I think you are looking for an LM3914 but you will need a rising/falling analogue voltage to create the progressive LED effect. Alternatively you could program a micro or use something like an Arduino.

I am Looking for an Arduinoless solution.

 

you need a knight rider vu meter, you can substitute the sawtooth osc for a 555 timer.


http://www.bit-tech.net/modding/2002/06/22/knight_rider/2

Knight Rider circuit is not as per my requirement. It is lighting one by one. But the first LED will not stay ON until all 10 light up.

 

Knight Rider circuit is not as per my requirement. It is lighting one by one. But the first LED will not stay ON until all 10 light up.

Set it to bar mode instead of dot, with pin 9, you clearly dont read the posted info....

 

Set it to bar mode instead of dot, with pin 9, you clearly dont read the posted info....

Sorry. I couldn't notice that.
One doubt. Can I replace LM4558N with a 555 timer? If not, why?
Thanks in advance!

 

Dodgydave already said it was an option to swap in a 555.

 

What I understand is LM3914N needs a steadily increasing voltage input to show the graph. Can 555 produce that steadily increasing voltage output?

 

Yes across the charge capacitor on pins 1,2, you can buffer it if you want or feed the input of the Lm3914 direct from pin 2 of the 555,

the capacitor charges from 1/3 to 2/3 of the supply voltage, ( thats 4V and 8V on a 12V supply) just set the ref HI. and ref LO of the Lm3914 .