Counting PCB Using Dual 7-Segment Display - Circuit Wizard

[Ethan Dighton]

Hey,

I'm looking for a circuit diagram for a circuit that can count up to 100,000 using multiple Dual 7-Segment Displays and on the program Circuit Wizard

Any Responses would be grand!

Thanks In Advance,
Ethan

 

[wookie]

Hi Ethan,

I still use Circuit Wizard from my school days, its great at simulating circuits and playing around with components - you learn a lot.

I would recommend a push-to-make switch that feeds into a decade counter's input. You will see on the software (use the Voltage Levels view) that when the counter recieves a pulse, it changes from one output pin to the next. When it gets to 9, it will reset back to 0.

Unfortunately, this output must be decoded to work with a 7 segment display. For that, we use a decoder chip (also available on CW). Feed the counter into the decoder and then into the 7 segment and voila - you have wired up the first digit, 0-9.

To count to 99, you will need to copy the same circuit. This time, instead of wiring the switch to the input of the counter, you wire the 10's pin of the first counter to the input. This means that the second circuit will only recieve one pulse every 10 button presses.

To count to 999,999 using this method, you must copy the circuit four more times (six overall).

Since this is obviously a gigantic circuit with 12 IC's and hundreds of wires, I would not recommend building it. There is bound to be a wiring fault somewhere and you will spend ages trying to figure it out. Still, it is worth simulating it to get an idea of how the circuit would work.

If you want to actually build this counter, I would recommend using a multiplexer for the 7 segments. Much less hassle with wiring but a little harder to design (CW can do it though)

 

[Ethan Dighton]

Thanks Wookie,

Ill have to give that a try!

 

[bill nahd]

Hello Ethan,
Using the CMOS 4026 could be a solution.
it is a counter/7 segment display driver in-one. just make as much combi's (4026 with display) you want and pass the clock signal from the one to the next.
keeps the wiring simple...
-bill-

 

[Leonardo_01]

Hi Ethan,

I still use Circuit Wizard from my school days, its great at simulating circuits and playing around with components - you learn a lot.

I would recommend a push-to-make switch that feeds into a decade counter's input. You will see on the software (use the Voltage Levels view) that when the counter recieves a pulse, it changes from one output pin to the next. When it gets to 9, it will reset back to 0.

Unfortunately, this output must be decoded to work with a 7 segment display. For that, we use a decoder chip (also available on CW). Feed the counter into the decoder and then into the 7 segment and voila - you have wired up the first digit, 0-9.

To count to 99, you will need to copy the same circuit. This time, instead of wiring the switch to the input of the counter, you wire the 10's pin of the first counter to the input. This means that the second circuit will only recieve one pulse every 10 button presses.

To count to 999,999 using this method, you must copy the circuit four more times (six overall).

Since this is obviously a gigantic circuit with 12 IC's and hundreds of wires, I would not recommend building it. There is bound to be a wiring fault somewhere and you will spend ages trying to figure it out. Still, it is worth simulating it to get an idea of how the circuit would work.

If you want to actually build this counter, I would recommend using a multiplexer for the 7 segments. Much less hassle with wiring but a little harder to design (CW can do it though)

Will this work with single 7-segments or only dual?

 

[AnalogKid]

It is considered bad form to add a different question to someone else's thread, especially one over two years old.

The CD4026 is CMOS part that is a single decade counter and 7-segment display decoder all in one chip. The datasheet shows how to interface several different display types to this part.

ak