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As Halloween was approaching, and our local doggie daycare announced their pet Halloween costume contest I was trying to figure out what costume to make for my dog Jericho. At some point I realized that since Jericho is black, and you can't see him at night, some sort of contest involving light would be perfect, no to mention extra safe.

Then I thought about how we have LED strips, I decided on an LED spider. The LED strips almost touch the ground so they look like moving spider legs. I have a video at the end of this instructable.

After going through the process of making this costume I realized that it would also make a great decoration. Rather than attaching it to a pet harness, just attach a string and hang it up.

In the first step I will go through all the materials needed to make the LED spider, both as a costume and as a decoration.

After that I will go through preparing the box, preparing the strips, setting up the electronics, and putting it all together.

Step 1: Gather Materials

The first step is to gather all of the materials and tools you will need to make the costume.

Materials:

- 8 LED Strips

Alternatively, if you are find with doing a lot of soldering you can get a roll of strips and cut them to the desired length and solder on the connectors. This method would definitely be a lot cheaper.

- 1 clear box

I used the Digilent project box because I happened to have one. It has thin enough walls to cut through, but stays securely shut. It is also the correct size to sit on my dogs back.

- Clear Small Zipties

They don't necessarily need to be clear, since this will mostly be seen in the dark, but it looks nicer.

- Clear Spray Paint (Optional)

In one version of this costume I sprayed the clear box with clear spray paint so that it looked cloudy. I found this helped diffuse the light better so the box looks more like one shape rather than a bunch of dots.

- Solid Core Wire

You'll need wire to do the bread-boarding for the LED strips. Solid core is easier to use with breadboards. It would be best to have at least 4 colors of wire so that you can differentiate between the different signals, i.e. power, ground, data, etc. The wires from this wire kit work really well for this.

- Half Size Breadboard

A half size bread board will fit best inside the box and obstruct less light, plus you only need a few rows.

- UC32

This will tell the strips the color and brightness.

- 8, 3-pin headers

To connect the strips to the breadboard.

- 4 AA, Battery Pack

To power the board and strips.

- AA Batteries

Tools:

- Hot glue gun and Hot glue

- Sharpie

- Paper

- Calipers

- Exacto Knife

- Drill

This isn't required, but starting the holes with the drill makes it a lot easier.

<p>Well done mate nice project, I take it the dogs not afraid of spiders then :)</p>

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