This Instructable will show you how to create your own garage laser parking system (the modern day version of the tennis ball on a string.)  Stop now if you don't have a basic understanding of electronics or how to safely use a multimeter.  I take no responsibility for any damage done to you, others, your property, or the property of others!

Items Needed:

- Garage door opener with a light that automatically turns on when the door opens

- Cheap laser pointer

- Voltmeter / multimeter

- Soldering iron & solder

- Needle nose pliers

- Wire cutters and strippers

- Rotary tool (Dremel, etc.)

- Small zip ties

- Sacrificial AC adapter (wall wart)

- Heat shrink tubing

- Light bulb socket outlet adapter

- "Short" light bulbs

One small side note here:  LASER is actually an acronym, standing for "Light Amplification by Stimulated Emission of Radiation."  I will not be spelling it using all caps in this Instructable, however.

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Step 1: Determining the Operating Voltage and Polarity

The first step is to determine the polarity of the battery contacts and the voltage needed for your laser pointer to operate.

Remove the laser's battery cover - usually just a screw-on back.  Before removing the button cell batteries, take a look at how they are oriented.  Button cell batteries typically have their positive terminal on the flat side with all of the writing, leaving the other side with the negative terminal.  The writing on the flat side should have a plus or a minus indicating this.  If the flat (positive) side is facing the rear of the laser, that means the chassis acts at the positive contact.  There should be a spring or something similar acting as the negative contact on the back of the laser's circuit board underneath the batteries.

Take the button cell batteries out, count them, and multiply that number times 1.5 (button cell batteries are typically 1.5V each.)  The resulting number is the total voltage needed for your laser to work.  For example, if your laser pointer uses two button cell batteries, it will require ~3V to operate.

tak1452 years ago
Great idea. I built this for the wife. if I ever clear out my half of the garage I'll build 1 for myself.
n-2-stuff2 years ago
Hey Fixxxer
This is one of these things that is so simple why didn't think of it myself. Great job. You got my vote. Good luck. I need to build one for the wife. LOL
fixxxer (author) 2 years ago
Thanks for the positive comments, everyone!  Please vote for me in the Hurricane Lasers Contest!  If I win, I promise to make you something with the laser cutter that I'd get!  :)
Hi fixxxer,
You got my vote ! :)

paulinex1272 years ago
By wikipedia; "A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons."
Paulino Alves, Aveiro - Portugal
gswartz11202 years ago
Great idea
A simple concept, inexpensive and much better than the "tennis ball on a string" I've been using for years. Way Cool!!!