I am stucked in our 5th plate where we are tasked to create an 8-bit BCD adder and subtractor and display its result in a dual 7-segment display.

the circuit for the adder and subtractor is already done and correct. we tested its output using LED and it works fine. but we need to output it on a dual 7-segment display.

the dual 7-segment display that we have has 10 pins where 7 of its pins are A to G (which corresponds to the 7 segments of a single display). we need to output different digit each segment so that we can display the correct output. we also used 7483 to decode it into a 7 segment display. but the problem is, when we connect the output pins of 7483 into the pins A to G of dual 7-segment, both 7 segments output the same digit and when it's over the digit 9, the display will not output 10 or even 0.



so how to implement the 8-bit adder and subtractor into dual 7-segment properly such that we won't use arduino as we are prohibited to use it.



thanks for responses

 

Welcome to AAC!

Post a schematic for what you have.

Are the numbers you'll use for input restricted?

No need for multiple posts. And this should be in Homework Help so you aren't given answers; which would be cheating.

 

so how to implement the 8-bit adder and subtractor into dual 7-segment properly

That's not a trivial task.
Suggest you search for the several old threads on this forum about binary-to-BCD conversion.

 

The 7483 is not a seven-segment decoder, it's a 4-bit binary adder.

 

Welcome to AAC!

Post a schematic for what you have.

Are the numbers you'll use for input restricted?

No need for multiple posts. And this should be in Homework Help so you aren't given answers; which would be cheating.

 

Is that supposed to be a working circuit that does what you want?

 

Please post something with sufficient resolution that we can read part numbers.

You can print to PDF from Proteus and post that. Turn off the awful grid.

Remove the circuitous routing and unnecessary whitespace on the right.

Clean up the wires running under symbols. We don't do that. It also looks like you have wiring errors on U13. A wire appears to be touching 2 pins and you have unconnected pins.

Rather than jog the inputs of U13, move the component down to align with the IC driving it. Might be U7, I can't tell because there's not enough resolution.

 

here

 

when it's over the digit 9, the display will not output 10 or even 0.

Does this answer your question?