Electronics

Highlander · Joined: 29 Mar 2006 Posts: 1

Hello,

New to the forum here; thought this would be a good place to start.

I'm attempting to build a replica of a prop from a TV series called "Sliders". It's fairly old, but I absolutely love it.

So anyway, this basically is a TV remote (in this case, VCR) with lights and such. However, I want to make it as true to the show as possible - even though it is my own design.

Here is an origional pic of the remote I will be using. As I don't need the internal parts, I have already carefully taken them out.

I am going to use an LED numeric digit display, probably two or three. For other various lights, I will use red, green and yellow LED lights. And of course, there will be a switch to turn it on and off. I also have a kit to make circuit boards from scratch.

This is a general guide to where I wish to place these:

My delima is that I don't know a lot about electronics. I've read through some basic books, but what I'm trying to do is not so simple. The LED display needs to count down from a randomly generated number to zero, then start over again. Also, I would like the lights to blink (but that shouldn't be so hard).

Any help would be great.

Thanks[/img]

petemar · Joined: 01 Jun 2006 Posts: 6

First of all, what you are doing is fairly simple. Now, we'll start with the function of counting down from a randomly generated number to zero then start counting down again. All you need for this is a couple of JK flip-flops set up as a counter or an integrated up/down counter. Either way you would probably want a mod 16 (it counts from zero to fifteen or fifteen to zero depending on where you put the clock input). You would take the outputs of this counter (discrete or integrated) and put it into a 7-segment decoder (if you want this number displayed digitally) and have the outputs of the decoder tied to the a thru g inputs of a 7-segment display. If you want these numbers to be displayed in binary code (the only alternitive) you could connect the outputs of the counter to led's (LSD to Far right LED and MSD to far left). However, I don't know if you want to work within the constraints of already built 7-segment packages. You could get the schematic of a seven segment display and wire up your LEDs like a 7-segment package. Then you can display your numbers in a larger area. If you want to have it light the LEDs which are in the holes marked 7,6,5 etc. you would have to design your own decoder or ask me and I'll design the whole circuit for you.
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