Laser Communication Device (Arduino Project)
how to make a simple device that transmits text via laser diodes and photo resistors. The attached video describes the process in detail. This is the written version of that.
What you need is: 2x Arduinos, 5x 5 volt 6 mm diameter laser diodes, 5 photo resistors, 5x 1/4 inch diameter 6 inch long acrylic tubing, material for housings (I used two 1x1x6in wax blocks), and computers with supporting software. To build the housing I used two rectangular blocks of wax, which makes for easy drilling. The material, spacing and sizes are arbitrary. Attached is a PDF of my set up. Note that this is the original design, when I used entire laser pointers instead of laser diodes. The extra 7/16 inch holes drilled in the left block can be ignored if using laser diodes. The acrylic rods are 6 inches long. If you are using wax like myself, after you drill the 1/4 inch holes you will find that the 1/4 inch diameter rods will have difficulty fitting. To fix this cut an end off an acrylic rod at an angle and make marks for desired depth (roughly 1/2 inch). Then insert with a twist to shave in inside walls of the hole to accommodate the acrylic rods. The tool is shown in the picture above. After doing so the rod should have a snug fit at the end of the shaved length. Next one block will need to have the laser diodes hot glued in. Make sure that they are pointed in the correct direction, directly out of the holes within the wax block. I did this by pushing an acrylic rod into the hole so that the diode can sit flat on top while the gluing took place. This last step will then be repeated on the other housing block except using the photo resistors.
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