Electronics 2000

Hi

Thanks for letting me post in this forum.

I have done some basic knowledge of electronic circuit work, from around 1994. But have not been in touch with electronics since then. A close friend wants to create model with LED's and has asked for some help. In turn i need help to find out what is the best way to do this i.e . what components to use , where to get the components, how to go about doing this. I live in rickmansworth near watford in the uk.

Here is the spec -
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SPECIFICATIONS for "Changing Bodies" model.

1) REQUIREMENTS are as follows...
Sixteen (16) LEDs in running sequence. Each LED runs in a consecutive sequence, without pause, giving the impresssion of travelling in a single direction from left to right (no bounce back). Only one LED is lit at any one time. Each lit LED shuts off previous LED. At the end of the 16 LED sequence, the whole sequence resumes after a pause of four seconds.

2) TIMING
A single press button control switch to choose the sequence of Time delay between each LED as follows:-
Sequence A: 0.25 of a second - end of sequence pause of four seconds and Sequence A repeats indefinately.
Sequence B: 0.5 of a second - end of sequence pause of four seconds and Sequence B repeats indefinately.
Sequence C: 1 second - end of sequence pause of four seconds and Sequence C repeats indefinately.
Sequence D: 2 seconds - end of sequence pause of four seconds and Sequence D repeats indefinately.
Sequence E: 3 seconds - end of sequence pause of four seconds and Sequence E repeats indefinately.
NOTE: Each sequence above is mutually exclusive.
Each press of the control switch to change the mode and timing

sequence as follows: A/off/B/off/C/off/D/off/E/off.

3) POWER REQUIREMENTS
* Removable power cable fitting, as in a printer or scanner. Mains plug as per local region.
* Mains power transformer enclosed within system.
* Option of mains or battery power.
* Batteries to be charged in situ, via mains, as needed.
* Model to be working as batteries simultaneously recharge.
* Auto cut-off when batteries are fully charged.
* Sufficient 2450ma AA batteries for fifty four hours minimum running time.

4) Limited space available for fitting all the above requirements. Total of three spaces in each model as follows:
One space of 180x80x30mm
Two spaces of 160x60x25mm
Please ensure all assemblies are secured within closable plastic circuit or battery boxes within above dimensions.
All boxes to be connected by ONE METRE of cable to allow for suitable placement within display model.

5) To recap, boxes are needed to house the following hardware:
-AA battery: x12 or more
-circuit board + chip + LED wire connector
-transformer
-mains connector assembly/switch
-LED program switch
-on/off switch

6) We have our own LEDs with extension wires.
We will fit these to the model ourselves.
It is required that the LED wires are PLUGGED into the circuit board - NOT soldered.

7) Please see attached picture for clarification. Model size is 80 x 43 x 5cm


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I ain't going to design the circuit for you but take a look at the 4017 it may be a good starting point?