Step 1: Building the Laser Mount
The goal here is to build something fast and cheap to mount the laser. The laser mount needs to be adjusted up/down and left/right.
I unscrewed the 5mW laser bottom, removed the batteries and soldered on 2 wires. The negative to the coil spring. The positive to the case. The wires were about 1 foot long each. I stripped about 3/4" off the ends to allow for twisting tot the main feed wires.
I was mounting to a vertical stud piece. I used 2 blocks of wood with a SINGLE hole drilled in each. This allowed the adjust as shown in the picture.
I used Velcro to secure the laser to the mount. I got some vibration and added a piece of tape over the laser to secure it to the wood to reduce vibration when the kids jumped up and down.
Step 2: Building the CDS Photo Resistor Mount
I used a piece of 1 1'4" PVC pipe cut into 4 2" sections. This is easy to mount and small enough so it wont get whacked by kids.
- Shove a lump of Plumbers Putty (see picture) in the back of a section and pushed the CDS cell through. Plumbers putty is cheap and is in Home Depot.
- Drill a small hole in the PVC pipe, pass the 1 foot wires through and and solder to the CDS cell.
- Secure the wires at the hole with some epoxy so they wont wiggle.
- Wrap scotch tape over the end of the open hole to act as a diffuser for the laser beam.
- Wrap a loop of electrical tape around the PVC to secure the scotch tape.
Again, as with the laser mount, get 2 small pieces of wood and drill ONE hole in each as shown in the picture below. Secure the PVC tube to the wood with Velcro.