Instead of the method depicted in the sketch posted previously (using a bell crank), I have researched further and found that it would be more efficient for me to use a mirror galvinometer to split the single laser beam. The only problem is that the market value of mirror galvinometers is around $400. My dad and I are working on finding a surplus one for less than that.

Proof of Work: Park 2 of 2

I drew this diagram to show how the light source is eventually split into multiple beams. A 12V DC motor rapidly rotates (in an arc) a small square mirror connected by a push rod. The mirror, on a bell crank, reflects the light source being shown into it into a "fan" of light. This fan of light passes through the splitter - a divide that only allows light through the evenly spaced slits. These newly separate beams of light are reflected vertically by a second mirror, now ready to be interrupted/played.

Above: Preparing the mirror to be connected to the bell crank. 

Proof of Work: Part 1 of 2

This is the laser beam light source (still in one initial beam). 

I have been busy with other things and have not made any progress on my laser harp the past three weeks. I hope to work on it this thursday. Proof of work will be posted after.

I ordered a new laser from an online distributor because the one I had been using before was faulty.

My dad is staying with my grandma in intensive care at St. Luke's, and does not want me to continue the next step of construction without his supervision. I havn't made any progress this week because of this, but hopefully next week I can continue.

 Proof of Work - 10/3/13

Top Photo: Photo Sensor Off State - 211 mV DC with dim ambient light 

Bottom Photo: Photo Sensor On State - 431 mV DC with 3 mW green laser (532 nm) beam partially reflected from an incidence angle of 30 degrees