Discussion in 'The Projects Forum' started by parvez_19_01, Apr 6, 2009.

1. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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Hi!

I am a newbie
But I know basics

I have 160 leds with a power supply of 5v

I want to glow each of them after a delay of 0.00625 second

In this way all of them can glow in 1 second (0.00625 * 160 = 1 sec)

it should look like a running light

Regards

2. ### galal_mounir Member

Apr 5, 2009
29
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would u like to use a microcontroller or just simple components cuz if u r going to use simple components ur going to have a hell of a circuit its going to be very large while if u use a microcontroller it will be much easier but u need some microcontrolling basics

3. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
0
Could u give me both the options please

Apr 5, 2009
29
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Apr 6, 2009
12
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6. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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And if please u can tell me the option with simple components

7. ### galal_mounir Member

Apr 5, 2009
29
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so u need a 160 bit counter :| thats alot man cant u reduce the 160 leds a bit

mmmmm....

anyways to make this circuit using simple components u would need to use the 555 oscilator as a timer to time the pulses and use a shift register which shifts 1 so for example if it is 4 bits the first code will be 0000 then shift right 1 after the first clk so it will become 1000 then shift another 1 after the second clk so it will become 1100 and so on so u need to search for the highest shift register u can get, for this u would need a SIPO shift register and put 1 in the serial input

8. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
0
Sorry I am not that savvy

Can u let me one thing that if we use a capacitor
which charges fully in a second
and as it charges something which we trigger at specific interval
as the voltage increases something like that, you can better suggest

Regards

9. ### galal_mounir Member

Apr 5, 2009
29
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does that mean you dont want to use any ICs ????

Apr 6, 2009
12
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ya correct!

11. ### galal_mounir Member

Apr 5, 2009
29
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OMG !!!!!!!!! :| :| thats nearly imposible you need to use ICs man at least for the timing part its impossible to design a ckt like that using only resistors and caps

12. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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Cant use resistor capacitor transistor and

RC filter circuit

13. ### galal_mounir Member

Apr 5, 2009
29
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deadly hard and wont be acurrat

14. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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Can u tell me how to put a led on once the capacitor is fully charged?

15. ### galal_mounir Member

Apr 5, 2009
29
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you will need to use a comparator which is an IC as well :S to compare the capacitor voltage if it is fully charged or not

16. ### galal_mounir Member

Apr 5, 2009
29
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cant u use any IC's at all??? not even 1 ?????????

17. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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cant we use rc filter circuit to trigger at one certain point of voltage

18. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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I would like to know how to do it without IC

I want to know how the current flows from one part of the circuit to other

IC does solves that

creating a delay circuit without IC is also possible

19. ### parvez_19_01 Thread Starter Member

Apr 6, 2009
12
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sorry IC doesn let u know how the current passes

as it is all integrated

making a circuit with all basic and simple components lets to know how it flows

20. ### galal_mounir Member

Apr 5, 2009
29
0
u need a comparator to give u the trigger u need when the capacitor is fully charged other than that i cant think of a way to give u a pulse when the capacitor is fully charged