Hello, im trying to do circuit design that can show the letters of my name and surname on this display at 1 second intervals using a single 7 segment display. I have to use only 555 timer and some logic gates with 7 segment display. I did this circuit for 7 segment display but i dont know how can i use 555 ic timer

 

Where are the inputs A through D coming from?

 

i did nothing about that I don't have enough knowledge to continue

 

So who generated that schematic?
Do you understand how it works?

 

i did nothing about that I don't have enough knowledge to continue

Are you confident your schematic does work? How did you test it?

 

Why do you draw lines with so many bends when one straight line will do and be much easier to follow?

 

Here is a 7-segment counter with 555 IC. https://www.electronics-tutorials.ws/counter/7-segment-display.html
For letters, you will need to make some changes accordingly.

 

Here is a 7-segment counter with 555 IC. https://www.electronics-tutorials.ws/counter/7-segment-display.html
For letters, you will need to make some changes accordingly.

The link you provide only mentions a 555 one time in passing. The circuits also use 7447 chips to convert from BCD to 7-segment. This represents a significant step backwards from where the TS is already.

This is what happens when you just post whatever ChatGPT spouts at you.

 

What do the inputs A-D do? Does each one select one letter?
If so the next thing you need is a 4017,

 

So who generated that schematic?
Do you understand how it works?

i did, yes

Are you confident your schematic does work? How did you test it?

i think it works

 

Congratulations

 

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i think it works

Based on what?

It either works or it doesn't -- what's with the "I think" part. That implies that you aren't sure that it works, only that you believe that it should work.

Did you do a simulation with all 16 possible input codes and verify that the display shows the correct output?

If so, then it works. If not, then it doesn't.

You are going to have a hard time finding anyone willing to work through your rat's nest maze of wires to verify that it works (or doesn't).

If you were to dramatically clean up your wiring, it would be pretty easy to verify the design.

But let's assume that it works. Where does that leave you? If you want to display characters so that you can display your name, you will need to add a LOT more logic. How much more depends on how many distinct characters you need/want to display. Also, there is no way to display some characters, such as an "M" or a "W", on a 7-segment display in a way that most people would recognize it. So you have to make compromises and use unique patterns that you just "declare" are certain letters.

This is not something that I would recommend making a discrete logic circuit for. It is, however, a good exercise for getting started with using a ROM of some kind.

 

I understand that you have tested it by setting the four inputs to a range of values. So to progress this project you will need to create a circuit to set the four inputs for you in the sequence that generates your desired output - a counter or other sequencer that is incrementing on a clock input.

If you have organised your seven-segment decode logic to present the letters of your desired output in numerically ascending order, it will be quite simple to use a counter, otherwise you will need additional circuitry to derive the sequence you want.

 

How can I design this circuit?
i cant to write my name (berat sahin)

 

This is your assignment.

Begin by drawing the 7-segment display that will represent each letter in your name.

The circuit design will come later.

 

i can't continue

 

That is not what I asked you to do.
Here is an example:

"ALL ABOUT CIRCUITS"

 

MOD NOTE: @beratsahinf : Please, one thread per topic. The new thread you started on this same topic has been merged into your original one.

 

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i can't continue

I don't know if this thread is still open, but in order to design the circuit you described you should start by generating a MOD11 binary code counter to generate the input sequence for the logic circuit (hence the use of a 555 timer to provide the digital clock signal). Also, the circuit schematics you shared is not at all helpfull nor does it share any relation to your problem.

The circuit you provided seems to work only as a binary decoder for seven-segment displays. If you are to design the circuit you described you'll have to change all the logic through Karnaugh maps or boolean algebra.

 

I don't know if this thread is still open, but in order to design the circuit you described you should start by generating a MOD11 binary code counter to generate the input sequence for the logic circuit (hence the use of a 555 timer to provide the digital clock signal). Also, the circuit schematics you shared is not at all helpfull nor does it share any relation to your problem.

The circuit you provided seems to work only as a binary decoder for seven-segment displays. If you are to design the circuit you described you'll have to change all the logic through Karnaugh maps or boolean algebra.

I think you meant MOD12 -- I suspect you overlooked the required space between first and last name. Also, there should probably be a space between the names when it cycles back (so MOD13, in his case), but the problem description either overlooks that, or perhaps the circuit isn't supposed to cycle continuously.

While starting off with a modulo counter that is the same length as the length of the character sequence is a nice high-level decomposition, you then have to decode the binary output and produce the seven-segment signals. This has a lot of merits to it, but it results in a lot of extraneous gate logic.

Another approach, which is less flexible but results in considerably fewer gates, is to have the states be the necessary encodings of the characters. If no characters where used twice, this would require one FF per display segment. Since 'a' is used twice, an additional FF can be used to indicate whether it is the first 'a' or the second. Similarly, it can be used to indicate first space or second. For his name, that eighth FF could very nicely serve as indicating first name or last name, which makes turning on the red and blue LEDs trivial.