Making LEDs light up one by one

[xfire]

I need a simple circuit that can light up LED's one by one. Once the next led is lit up the previous one switches off. Use of micro controller would be difficult cause I'll be using at least 200 LEDs.
Thanks in advance

 

[Nigel Goodwin]

I need a simple circuit that can light up LED's one by one. Once the next led is lit up the previous one switches off. Use of micro controller would be difficult cause I'll be using at least 200 LEDs.
Thanks in advance

Use of micro-controller would be easier, BECAUSE you're using 200 LED's.

 

[xfire]

It'll take at least 7 micro controllers. Programming each would get more complicated. I'm currently planning to use 4 to 16 decoders with 555 timers, but the counter isn't counting. I'm using T74LS93.

 

[MikeMl]

I'd do a row-column diode decoder matrix where the LED itself is the cross-point diode. 16 rows and ~14 columns would do it. Use two 4in to 1 of 16 decoders, two 4 bit counters, and a clock oscillator.

 

[xfire]

Sounds good, thanks a lot

 

[Nigel Goodwin]

It'll take at least 7 micro controllers.

No, it would take just one, and a few extra chips.

 

[Transistorman]

I need a simple circuit that can light up LED's one by one. Once the next led is lit up the previous one switches off. Use of micro controller would be difficult cause I'll be using at least 200 LEDs.
Thanks in advance

using microcontroller would be easier

try to do Charlieplexing

A Charlieplexed digital clock which controls 90 LEDs with 10 pins of a PIC16C54 microcontroller.

 

[xfire]

I've tried with an 8051. I've used the basic circuit and I'm attaching the program. I didn't make the matrix but connected leds to the port.They didn't glow. What I'm I doing wrong?
I've tried keil and the ports do go in the order required.

 

[Transistorman]

I've tried with an 8051. I've used the basic circuit and I'm attaching the program. I didn't make the matrix but connected leds to the port.They didn't glow. What I'm I doing wrong?
I've tried keil and the ports do go in the order required.

8051 dont have much pin to control 200 leds ( except using multiplexing )

the only chip that i know can make a running led with one port is 4017

i dont know the same chips

hope the other can help you

 

[colin55]

You can do 100 LEDs with 2 4017's

 

[Transistorman]

You can do 100 LEDs with 2 4017's

RIGHT !

i will try to make the schematic

 

[xfire]

Thanks a lot I've tried with decoders and 8051. None of the circuits are giving the output.

 

[Nigel Goodwin]

Thanks a lot I've tried with decoders and 8051. None of the circuits are giving the output.

Will an 8051 even drvie LED's?, I thought they had very little output capability?.

 

[xfire]

I'm not even getting an high output and this guy did it
**broken link removed**

 

[Nigel Goodwin]

I'm not even getting an high output and this guy did it
**broken link removed**

In which case you did something wrong.

 

[colin55]

**broken link removed**

 

[xfire]

That helps a lot I'll try it and let you know

 

[Transistorman]

here is the circuit

 

[xfire]

Hey, what do i use to view the file? I tried pspice and atrium designer. None of them worked

 

[Transistorman]

Hey, what do i use to view the file? I tried pspice and atrium designer. None of them worked

use ExpressSCH

but please dont open it right now , still have some error ( not really an error , just a little mistake )

open it after i edit it , ok