Instructables
Picture of Sequential Lighting LED Disc
Using a motor, some LEDs, a battery, and a few other things, it is possible to create an amazing device that serves no purpose aside from decoration and learning. LEDs on a small disc will light sequentially as a motor spins. This is a fine alternative, if I might say, if you do not wish to go through the process of buying/building, and programming a microcontroller.

Step 1: Parts

Part list:
LEDs
Motor
K'nex (can be substituted with any other structure-building thing)
Wire (Hookup, and stranded wire)
Cardboard, Plastic, or similar
Pliers
Aluminum Foil (Conductive ink of some kind is a preferable substitute. I didn't have any.)
Tape
Glue
Wood or something to form a base

Step 2: Foil

Picture of Foil
001_1534.JPG
This disc will spin and complete the circuit to light the LEDs on the other disc.
If you are using conductive ink, skip this step.

First, trace a circle in the foil.
Next, cut it out (carefully as foil has a tendency to tear).
You will need to cut two out.
Then, cut out a hole in the center of each circle.

Cut out two smaller ones to fit inside the larger ring (leave some room between the smaller one and the ring).

Step 3: Disc 1

Picture of Disc 1
001_1542.JPG
Now, it is time to make the conductive disc.
Cut out a circular piece of cardboard (or plastic, or whatever you have).

Aluminum Foil-Mount the foil to the disc by poking wire through each side and twisting it to secure the foil.

Conductive Ink-If you are using conductive ink, just make a thick ring around the edge of each side, maybe a centimeter thick depending on the size of your disc. Make a thick circle in the center as well. Then put a piece of wire through one side and out the other. Secure it there to make the ring on each side one conductor.
 
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ahossain31 year ago
Dear sir,
I need a simple circuit with a single LED which will blink at a rate of 10 times per second.
But it will blink for three different times duration with three different interval. For example;

-------------------- (20 times blink in 2 seconds, then 2 Second gap/pause)
---------- (10 times blink in 1 second, then 1 Second gap/pause)
----- (5 times blink in 0.5 second, then 0.5 second gap/pause)
then the process is repeated continuously until disconnecting from power.
MdP1632 (author)  ahossain31 year ago
I would suggest using a microcontroller such as an Arduino for that kind of project. Without a microcontroller, I can't think of a way to implement that without a very complex circuit.
MdP1632 (author) 6 years ago
Sorry about the blurry pictures. My camera isn't very good.
arrow shot6 years ago
awesome 2 get the LED out contestants in knex section. I got a circuit kit once (awesome snap circuit set) i wasnt much of a fan with the led light..
dsman1952766 years ago
interesting. you should put knex as a key word.