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Count sequence design using 7 segment display.

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New Member
i need to design a count sequence of 4,2,1,8 in decimal. can be initiated with a push button or toggle switch. can be detected in hardware or software and displayed on a 7 segment display(trainer). count sequence can be accomplished by using a parallel load register or any counter design. NEED HELP I AM CLUELESS?? any help would be great
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Well-Known Member
Most Helpful Member

I can give you a few hints...

You can use a 4 bit shift register to shift a "1" around, that
will be your counter. The count will go 1,2,4,8, but you can
swap output lines to get the actual count sequence you want.
You can then run that to a 7 segment decoder to drive a 7 segment
LED device.
You'll also need an oscillator unless you want to drive it with
repeated pushes of the button.

Hope that helps...


MrAls's hints weren't good enough? What have you come up with?


New Member
Those hints were very good hints. If you had any idea what you were doing, they would have made perfect sense. Besides, this thread already got locked once for simply asking people to do your homework. Posting it twice won't make people any more willing to do it for you.


Well-Known Member
Most Helpful Member
Hi again,

Another little hint...

You can use a regular binary counter or two flip flops as the main counter,
run the outputs to a 1 of 8 decoder, use four of the outputs to run to
a 7 segment decoder with a 7 segment LED connected to it.
If you run the outputs of the 1 of 8 decoder correctly to the 7 segment
decoder, you will get the exact sequence you are looking for.
Again you will also need an oscillator or push button (debounced) to drive
the counter.


New Member
the first post MrAl made was the full answer, and would have worked perfectly.

im going to assume you'll want a button instead of the oscillator, so your teacher can click to step through.
i had to do this same assignment a year ago.
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