first response monitor game - Electronic Circuits Projects Diagrams Free

sambols · 9th June 2007, 10:24 AM

I am trying to create a little quiz type game, like the popular show Sale of the Century. Our family would use the device to determine who will be able to answer the question when the TV show asks a question.

Specifications:

1) There are 3 players each with a press button and 2 LED's, Green and Red.
2) The first button pressed illuminates it's GREEN LED, and locks out the other 2 players, illuminating their RED LED's.
3) There is to be a RESET press button to turn off all LED's and make the circuit ready for the next question/round.

I will use CMOS 4000 series ICs.
Main Gate Type - NAND gates
Switching - Active high switch
LED's - Active high LED's
Quad 2 input NAND gates are to be used, CD4011B.
Inverter - HEX buffer Inverter TC4069
The power supply will be a 9 volt battery.

See the attachment for a diagram.

I have 2 Q's.
1) Need some help with resetting the circuit so all the LED's are off before the next round can begin.
2) Is this the right place to stick the inverter?

Hero999 · 9th June 2007, 11:52 AM

Your schematic isn't very clear.

This is how I would do it anyway.

ericgibbs · 9th June 2007, 01:40 PM

Quote:

Originally Posted by sambols

1) There are 3 players each with a press button and 2 LED's, Green and Red.
2) The first button pressed illuminates it's GREEN LED, and locks out the other 2 players, illuminating their RED LED's.

3) There is to be a RESET press button to turn off all LED's and make the circuit ready for the next question/round.
The way you have the connected you cannot turn OFF all the LED's at the same time.
I have 2 Q's.
1) Need some help with resetting the circuit so all the LED's are off before the next round can begin.
Its easy to reset all the latches, but you will get all the GN LED's ON.

2) Is this the right place to stick the inverter?

The invertor is not going to make it work

I have looked very carefully thru you drawing, I can see what you are trying to do, but you will require a lot more logic to make it do what you want.

Its a very good idea, but I would suggest you relook at your design.
The problem with latches, is that one half of the latch must be ON and the other half OFF, until you flip it over, then they change to OFF, ON.

on1aag · 9th June 2007, 01:46 PM

Hi Sambols,

If you want the circuit to function the way you described, you gonna
have to make a few minor modifications.

on1aag.

ericgibbs · 9th June 2007, 02:19 PM

hi on1aag,

That should get the job done, I was thinking along the same lines.

I dont like to discourage young 'students' but the way that he had it drawn, it would not have worked without additional logic.

The problem he would have run into, was locking out the other players, on any 1st push.

Regards

sambols · 10th June 2007, 01:06 PM

Can you help me to better understand the lockout using the following diagram.

ericgibbs · 10th June 2007, 01:55 PM

hi,

Hope on1aag dosnt mind too much.

Look at the drawing,
when the RESET pb is pressed, thats the RED lettering
if #1 pb is pressed thats the BLACK lettering.

Basically after a RESET, any #1 thru #3 pb will change the state of its input latch and generate a clock pulse for the output latches.

After that single clock pulse no more postive going clock pulses can be generated, until the system is RESET.

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9th June 2007, 11:52 AM	(permalink)
Hero999	Your schematic isn't very clear. This is how I would do it anyway. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

9th June 2007, 02:19 PM	(permalink)
ericgibbs	hi on1aag, That should get the job done, I was thinking along the same lines. I dont like to discourage young 'students' but the way that he had it drawn, it would not have worked without additional logic. The problem he would have run into, was locking out the other players, on any 1st push. Regards __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 9th June 2007 at 02:22 PM.