# Combinational logic circuit project...any suggestions

Discussion in 'The Projects Forum' started by electrogirl, Jul 16, 2010.

1. ### electrogirl Thread Starter Member

May 2, 2010
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Hi. In our logic class we are currently on the topic of the boolean theorems, and our instructor asked us to do a project on combinational logic circuit. I'm posting this thread to gather some suggestion on a project about combination logic circuit. Simple projects would do as long as it is useful. Thanks!

2. ### Wendy Moderator

Mar 24, 2008
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How about electronic dice, using LEDs to make a dice face? You would have to design the logic between the mod6 counter and the LEDs.

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3. ### hgmjr Moderator

Jan 28, 2005
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Another project would be a HEADS/TAILS virtual coin toss generator.

hgmjr

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4. ### electrogirl Thread Starter Member

May 2, 2010
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thanks hgmjr! but how would I implement that?do you have the schematic for that?

5. ### hgmjr Moderator

Jan 28, 2005
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Here is a link to an article that covers one implimentation of a coin toss design.

This circuit may not exploit combinatorial logic to the extent that your assignment requires.

If that is the case, then you could consider an electronic lock. The input could be multiple toggle switches that would then feed the combinatorial logic that would then have to be set in the correct pattern to enable the lock.

hgmjr

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6. ### Wendy Moderator

Mar 24, 2008
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When I was in college I build the dice just for the heck of it. I also built the coin toss, but there was a bias in the coin toss I couldn't figure out.

The dice worked great, which made it all the more puzzling when I discovered I'd left some power supply pins unconnected. Evidently the logic was getting enough power through the inputs to power some of the chips.

This is the format I used for the dice (7 LEDs), and their permutations.

o . o .... ... .... ...o.... ...o....o...o....o...o....o...o
o o o .... .o. .... . . .... .o. .... . . .... .o. ....o. .o
o . o .... ... .... o.. ....o... ....o...o....o...o....o...o

It isn't too complex, but does require a nice mix of gates. My project fit into a really small radio shack box using 1970's technology.

Last edited: Jul 17, 2010
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7. ### electrogirl Thread Starter Member

May 2, 2010
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thanks for the suggestions guys!