multisim

[aak1703]

You will be required to design a 'Night Timer' system.night. The

timer should have four 7-segment LEDs i.e. should count up

to 59 minutes 59 seconds in increment of 1 second. Nosferatu

can pause the timer if he spots a beautiful lady while

joyriding. He can also reset the timer any time he wishes to.

You will have to design an electronic system with:

1. Four 7-segment RED LEDs. (his favourite colour)

2. One PAUSE button and one RESET button to pause and reset the timer as needed.

3. Nosferatu starts cycling once it gets appreciably dark. You need to use and configure a Light

Dependent Resistor for that purpose. (Note: Multisim does not make provision for LDRs so to

simulate your design you have to use an Opto-coupler and potentiometer combination to represent

the LDR).

4. You need to use a step-down transformer as the system will have a 230V AC supply (Nosferatu can

generate electrical power from one of his special organ) and the timer should operate on 9V DC.

5. You MUST ONLY use the following components in your design: Power Source, Transformer, Opto-
coupler, Potentiometer, switches, LED Display, Resistors, Capacitors, Transistors, Diodes, Basic logic

gates ICs, Decoders, Timers, Counters and Flip-Flops.

6. You CANNOT use Programmable ICs, Micro-controllers or Multi-Function ICs to design the system

If someone could give me the solution to this question as soon as possible please..since am new to Multisim and i got a deadline by saturday for submission.
Thanks.  

[David22JRA]

Hello aak1703

I would like to know if you have any circuit where we can work and what is the counter that you might use?  I was thinking that we can use a cascade configuration using some 4 bit counter (IC) in this case we are going to have some decoders(and, or…)

Regards

[David22JRA]

Hello aak1703

I made an example for you that use one counter, decoder, binary to 7-segment and 7-segmt. You can start with that example and use a similar configuration to create the minutes count and hour.

I hope this example will be useful for you.

Regards

[aak1703]

Hi thnx for your support but am having difficulties to open this attachment as am using the ms13 version...if you could please help me it would be really kind of you as i should return this assignment by latest on saturday...thank you in advance

[David22JRA]

Hello aak1703

I apologize for that, actually I changed the multisim version of this example that I made and I hope will be useful for you.

Regards

[aak1703]

Thank you for your concern and help...can i revert back to you if i'll be needing any additional help please?

[aak1703]

the file u sent was very helpful..however im not able to implement the requested components in it..if u could help me even more plz..koz i really need to clear this module by the 20th..thx for u help 😄

[Dennis_Knutson]

Are you really expecting someone to do your homework assignment? You are being tested on YOUR ability to do the design.

[aak1703]

Had i known how to design the circuit i would not have bothered anyone and asked for help...anyway asking for help is not a shame and i don't think any of your above said words can be of any help to me....so i would really appreciate if you could be of any help to me...otherwise keep your comments to yourself and thanks for your so concern

[Dennis_Knutson]

You aren't asking for help. You asked someone to give you the solution. That's cheating. You have not shown anything that you have done. Your problem is much more than not understanding Multisim.