One nOOd can be powered from a single coin cell battery. This is the easiest way to get your lights up and running. Watch the video at the head of this tutorial for a step-by-step build.

1. Identify the + and - ends of the nOOd. Use alligator clips to connect the nOOd temporarily to the wires coming from the battery holder. When the nOOd lights up, you've got it the right way round. If it doesn't work, try reversing the connections.

2. Slip some heat shrink on and solder the nOOd to the wire. You'll get the best connection if you make a bend in the nOOd connector and in the wire, and hook them together before soldering. Take a little time and get it really well connected. This will make it far less likely for your costume to break while you're out wearing it.

3. Solder the other end as well.

4. Use tape, hot glue, or E6000 to fix the nOOd into your costume. It's silicone-coated so a lot of glues won't stick to it. I used a combination of masking tape and hot glue for the goggles project, which doesn't get a lot of jostling since the goggles live permanently on the hat.