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12 blinking led project???

I am working on a model that calls for 12 randomly (or appears to be
random) blonking LED's. I am a total newbie to this so I am looking
for help in working up a list of items I will need and help with the
circuit board I am guessing I will need to make these LED's blink. Any
help would be much appreciated.
 
B

Bob Monsen

Jan 1, 1970
0
I am working on a model that calls for 12 randomly (or appears to be
random) blonking LED's. I am a total newbie to this so I am looking
for help in working up a list of items I will need and help with the
circuit board I am guessing I will need to make these LED's blink. Any
help would be much appreciated.

You can buy blinking LEDs. Depending on your application, they may be
just right.

There are also circuits that simulate random times using shift registers
and such. They are much more complex.

I'd just go with the self-blinking LEDs. In that case, you need a
voltage supply, and a resistor for each one. Try 1k and a 9V battery.
 
B

Bob Eldred

Jan 1, 1970
0
I am working on a model that calls for 12 randomly (or appears to be
random) blonking LED's. I am a total newbie to this so I am looking
for help in working up a list of items I will need and help with the
circuit board I am guessing I will need to make these LED's blink. Any
help would be much appreciated.

If it were me, I'd develop a single chip solution using a cheap PIC
microprocessor with only 12 LED's, 13 resistors and a capacitor as
peripheral components, nothing more. I'd use a two port processor and drive
the 12 LED's with 12 of the 16 available bit lines. I'd run an internal
oscillator and generate a low speed clock. I'd use this to run a 256 bit,
maybe longer, pseudo-random shift register in eight or more of the
processors registers. I would tap the registers at various points and output
those signals to the LED ports. As the processor runs, the LED's would blink
on and off in a random way. It sounds complicated but is really quite simple
and is all accomplished in software (code). If you want more information or
help with code, etc. please e-mail me at nsmontassocatyahoodotcom. Remove
the ns from the beginning and put the normal @ and . in their places.
Bob
 
C

Chris Selwyn-Smith

Jan 1, 1970
0
I needed to do a similar thing and used some novelty christmas
decoration electronic kits available in th UK from Maplins

[email protected] wrote in @o13g2000cwo.googlegroups.com:
 
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