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 Counting to 15 with 7 segment displays?
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GreatPumpkin




PostPosted: Wed Apr 30, 2014 1:58 pm   Post subject: Counting to 15 with 7 segment displays?

Hey, does anybody know how to count past 9 using 2 7 segment displays ?
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Zren




PostPosted: Wed Apr 30, 2014 3:43 pm   Post subject: RE:Counting to 15 with 7 segment displays?

"Count"? What are you using to give input to the 7seg display? What's your current setup to count up to 9?

A smartass might count in a different base than normal if the upper limit was the value 15. heh.
Tony




PostPosted: Wed Apr 30, 2014 4:01 pm   Post subject: RE:Counting to 15 with 7 segment displays?

I'm guessing that there are two displays, each able to show 0-9. So 10 would be "display digit 1 and display digit 0". I'm not sure what the question here actually is.
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GreatPumpkin




PostPosted: Thu May 01, 2014 1:15 pm   Post subject: RE:Counting to 15 with 7 segment displays?

I made a 4 bit counter out of JK Flip Flops set to toggle.
Each time I press the button, the number on the 7 seg increases. I want to make it so when it hits the number 10 or (1010) it it splits it onto the second 7 seg. So that for 10, there is a one displayed on the first 7 seg, and 0 on the second. For 11, a 1 on the first, and 1 on the second, up until 15.

The question is how do you display a 4 bit binary number (2 digit decimal) over 2 7 seg displays? I need a system of splitting it up. I tried researching but absolutley every page I came across was about "Programming an Arduino or PIC for multidigit display".

I don't know where to start, except with maybe a D-Flip Flop that triggers when the number hits 9.. From there I'm not sure, and searching the internet has only returned frustration.
GreatPumpkin




PostPosted: Thu May 01, 2014 1:35 pm   Post subject: RE:Counting to 15 with 7 segment displays?

A thought I've had, make the counter max out at 9 then reset to 0, while at the same time setting a and extra bit to remember the 10's column.
GreatPumpkin




PostPosted: Sun May 04, 2014 10:08 pm   Post subject: RE:Counting to 15 with 7 segment displays?

Anything?
Nathan4102




PostPosted: Mon May 05, 2014 3:53 pm   Post subject: RE:Counting to 15 with 7 segment displays?

You've already nailed it, havn't you? Have you attemped both your earlier guesses?
GreatPumpkin




PostPosted: Mon May 05, 2014 5:33 pm   Post subject: RE:Counting to 15 with 7 segment displays?

I've attempted a simulated version, and it works fine, but it shouldn't take 5 bits to count to 15..

There's got to be a text book way of displaying two digits on 7 segs.. I've even found a textbook that has an activity where you hook a four bit counter up to a single 7 seg, but that doesn't help at all..
whoareyou




PostPosted: Mon May 05, 2014 7:20 pm   Post subject: Re: Counting to 15 with 7 segment displays?

Use AND/OR gates? If you have a 4 bit binary number ABCD (where A is the MSB and D is the LSB) then the 7 segment display should output 1 if A AND (B OR C) ... ?
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