there's a lot of ways to trigger them.

So we have the LEDs.

This'll be a switch.

Then the cape will be motion activated.

(Diana) I think that today we can maybe either make the inflatable part or do the LEDs.

I think we should do the LEDs right now.

Yeah.

LEDs?

Here we have an Arduino microcontroller.

(Izzie) "Arduino microcontroller."

Wonder what this is?

(Diana) We are going to use it to make the LEDs light up and twinkle.

The way a microcontroller works is, you program it on the computer, and then send the program to the microcontroller, and we're going to be able to control on the computer how long the different LEDs are lit up.

So we're telling it to basically turn the LEDs on, and then turn them off.

So let's make these 2 blink really quickly then.

It's loading.

Now, it's running the program.

(SciGirls) Oh that's so cool!

Computers are so smart.

[all laugh] We used the computer to program in what LEDs we wanted to light up when.

Oh, that's really cool!

That's awesome.

It's like Broadway lights.

That was really cool because it sort of showed us how it would look on the dress a little bit.

How do the lights go into the dress?

So we're going to sew the LEDs into the dress with a conductive thread.

(Hallie) Conductive thread has metal in it, so when we sew it into the leads of the LED, it makes a connection.

So do you want to finalize our prototype so that we can figure out how many rows we want to have, then we can figure out the blinking pattern too?

I think on the front of the dress we should have like, 3 or 4 rows.

then for the cape, I don't really know how many strips are going to be on the cape.

We could just kind of hold up the measuring tape?

So we're going to have 8 strips.

Our longest strip is going to be 65 inches.

You know, you guys, we only have 3 days now until the event.

A little bit freaking out about the time limit because we have to hand-sew all the LEDs.