# Knight Rider LED Circuit

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## Introduction: Knight Rider LED Circuit

Let me start by saying that I'm not the one who came up with this, and I am in no way claiming credit for this. With that said, I wanted to make something for the Kit Design Speed Challenge, so I dusted off my middle school I.T. notebooks and came up with this. I made this schematic on Upverter, which, in my opinion, is very useful, because it allows you to make schematics easily, and tells you what parts you used, in what quantity and where you can get them. This is a very simple design good for beginning to intermediate electronics, and is a good project for middle school technology classes. To see this schematic in greater detail, you can see it here. Comment if you have any questions/ comments.

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## Step 1: Materials

Materials: QTY:

8.2 KΩ....................................................1
3.3 kΩ Resistor.....................................1
Resistor 1 k ohm 0805........................ 6
1N4148 Diode......................................10
LED..........................................................6
10uF SMD Cap......................................1
0.01 uF C.................................................1
555 Timer................................................1
100.00 kΩ R............................................1
10KΩ Resistor SMD..............................1
4017.........................................................1
Extra wire (optional, but suggested)

## Step 2: The 555

For this step, you will need your 555 Timer, 0.01 uF C, 3.3 kΩ Resistor, and 10uF SMD Cap. Wire the components up as shown. Keep in mind, the very top wire is positive, and the bottom wire is negative. Pins 8 and 4, and your  3.3 kΩ resistor go straight to positive, and pin 1 goes straight to negative. Pin 5 goes to a 0.01 uF and then to negative. Pin 7 comes in directly after the 3.3 kΩ resistor. I forgot to put it in this schematic, but there is an 8.2 kΩ resistor right after pin 7 and right before pins 2 and 6.

## Step 3: The 4017

This is where it gets tricky. Every wire needs to be in the exact right place. For this step, you will need your 1N4148 Diodes, LED's, Resistor 1 k ohm 0805, 100.00 kΩ R, and of course, the 4017. Pins 2, 4, 5, 6, 7, 9, 10, and 11 all go to a diode. Pins (with diode now) 2 and 11, 4 and 9, 7 and 6, and 10 and 5, all pair up and go to a 1k ohm resistor. Pins (with diode now) 1 and 3 also go to a 1k ohm resistor. Now each of those resistors go to their own LED. Meanwhile, pin 15 goes to a 100 kΩ R. Now all of the LED's, pin 15's R, and pins 8 and 13 all go to the negative wire.

## Step 4: The Final Linkup

S you can see in this picture, the final linkup is between pins 3 on the 555, and 14 on the 4017. There is a 10K ohm resistor between them.  It is really simple, and you should not have any trouble with this step. Once you have connected that, hook up the positive side of a 9 volt battery to the positive (obviously), and the negative to the negative. Watch your lights chase each other back and forth!

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