Predator Tutorial: BioHelmet LED Laser

Alright guys, if you have been following my Predator tutorials/walk through’s then you have a biohelmet without a laser site!  Time to fix that!  I want to preface by saying I am in no way an electrician and I certainly may have done something incorrectly.

You are going to need:

  • 3 LED’s in the color of your choice (I used red cause it’s what I had… wanted to use purple though)
  • Resistor (use online Ohm calculator to find out what kind)
  • Extra wire (might not need this, but it’s good to have on hand)
  • Soldering iron and solder
  • Electrical tape
  • Plastic washer of some sort (got mine from the plumbing section)
  • Battery connector
  • Worbla
  • Hot glue gun with glue

Okay, so first, you need to drill your holes for the LED’s into your biohelmet.  Since this was my first sculpt and cast, I didn’t get the sizing right, so I drilled three small holes and put my LED’s up to the hole, but now through it.

This is what it ended up looking like.  Don’t worry, I’ll explain how I got to this part.  Once your holes are drilled, make a paper template of your holes, as well as your circuit (I placed the paper over my site and marked with pencil where the holes were).  YouTube has been a life saver on this Predator build.  I scoured YouTube and watched roughly a bajillion videos on how to do LED lights.  It helped give me a bit of confidence.  Also, my dad helped a lot.  🙂

Things to note:  On your LED individual pieces, there is a long end and a short end.  Check your supplier, but typically the long end is positive, the short negative.  I drew out my circuit, just as a helpful reminder of where everything goes.

In the first image, you can see my plastic washer thing.  I used my paper template to mark the holes on the washer.  Then, held it in place in my biohelmet and made sure everything lined up.  Then, I drilled the holes.

Once your holes are drilled, shove the LED’s through.  Then, bend the wires so the + are together and the – are together.  Do not let the + and – touch each other.  They need to be separate.

Solder your wires together (+ and -, separately).  Your resistor goes on the positive side.  Solder in place.  I used hemostats to hold everything in place while soldering.  They are terribly good conductors of heat, however, so I burned my fingers a few times.  I’d recommend using something with some sort of insulation.

Strip the wires on your battery connector and attach + to + and – to -.

Test!  Make sure everything works.  If it does, wrap everything in electrical tape, making sure to wrap the + and – wires separately.  If they touch, you will get a short.  My dad said you don’t need to wrap the – end since it’s a ground, but I wrapped mine anyway to be safe.

Once everything is wrapped, install.  I held mine in place and just squirted some hot glue on it.  Make sure the glue doesn’t seep out the holes, or onto the LED (it’ll dull the light).

I then made a battery pack out of worbla and attached to the crown of the biohelmet.

Paint that, and you’re done!  See, LED’s aren’t that scary!  And the finished product:

Until next time, keep cosplaying!  Any questions, comments, or requests, leave them below!