Materials

Materials	Where to Get
copper clad 20cm x 15cm	done
transparencies	done
hydrochloric acid	done - d’amico
hydrogen peroxide	done - d’amico
photoresist developer	amazon- product link
acrylic waterproof black ink	amazon - product link
small drill bits 0.25 mm - 1.15 mm 0.3 mm - 1.2 mm	amazon - product link
handle driller	done?
plastic container (small size, small enough for the board)
a clean tooth brush	done
rubber gloves	school lab
a timer	done

In Progress PCB Layout (Re-do)

Next step: Wire the pixels, making sure the wire is not too thin.

Conversions
MM --> INCHES

1.02 mm = 0.04"
0.5mm = 0.019685"
2.54mm = 0.1"
5.58mm = 0.22"
10mm = 0.393701"
2.21mm = 0.08700787"

Similar Idea

Interesting...

https://www.yahoo.com/tech/researchers-develop-braille-kindle-blind-160115335.html

Presentation Slides

Click on the LINK below for the January 14th Progress Report

LINK

Procedure for PCB

Procedure for creating a PCB with etching.

1. Procedure Etching a one-sided PCB

   1. Print the bottom side layer PCB layout on a transparency
   2. Wash hands to remove oils from hand, do not touch the laser printer with your fingers. Also keep the pages as flat as possible
   3. Remove packaging from copper clad and make sure you do not touch the surface of the copper clad either because of the same reason from above
   1. You can cut the copper clad to a small strip for testing
   2. Use a slightly damp paper towel to clean off residual dust
   4. Place the copper clad on a flat, strong and heat resistant surface. Set up a clothing iron to the hottest setting (Linen usually has the highest temperature)
   5. Make sure the copper side of the clad is facing up and the blank is facing down. Align the transparency with the toner facing toward the copper side). Do not move the transparency
   6. *CAUTIONS* Press hard on the iron on the transparency, which is on top of the copper clad
   7. Hold the iron on the same spot for one whole minute and make sure the pressure on the copper clad is hard
   8. For five more minutes, slowly remove the iron but make sure that the paper will not slide on the copper. Leave the cooper clad on the table until it is fully cool down. This is allowing the toner to stick to the copper and prevent getting burns
   9. After the copper clad is cooled down, place the board in a bucket of cold water and soak for about five minutes. Try to peel the transparent from the board, so that only the toner will leave on the copper clad.
   10. If you find the copper clad and the toner ink are misaligned, you can use lacquer thinner and paper towel to clean the toner from the copper clad and redo the procedure

   
   
   

   Part 2

   
   

   11. Make sure you are at a ventilated place with windows or a fan while you complete the following steps.
   12. Pour 2 cups of hydrogen peroxide to a plastic container
   13. Carefully pour 1 cup of Muriatic acid, these are the steps for creating the etching solution
   14. Make sure that you don’t use any metal containers or stainless steel sinks as tools with this mixture, that would add aggressively etch metal .
   15. Add the Acid
   16. Place the copper side up of the board in the plastic container with the homemade etching solution
   17. Use a soft plastic brush to wipe the board. The copper will begin to dissolve
   18. It will take about 5 minutes to get all the exposed copper dissolved.
   19. If you leave the copper clad for too long in the etching mix, the traces will dissolve under the toner that is supposedly protecting them
   20. *Put on rubber gloves* Carefully take the board out of the etching solution amid rinse the board under warm water for about 1 minute. Wash it clean and dry the board with a paper towel
   21. The solution should be used up because the copper have been dissolved within the liquid. Throw away the solution by diluting it in a 5-gallon pail of water. The acid level and the copper content will be decreased.
   22. If you intend to add ground planes on your board, use less etchant when you are making smaller sized boards
   23. Use lacquer thinner and paper towels to remove any toner left on top of the copper traces. This is to help the copper form oxidizing.
   24. Drill all holes through the through-hole parts using your choice of PCB drill bits and rotary tools.