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B RAILLE D ISPLAY

B RAILLE D ISPLAY. Katie and Kara Chylinski Advisor: Professor Hedrick March 5, 2005. O UTLINE. Background The Problem Our Objective Design Process Final Design Results Conclusion. I NTRODUCTION. Braille Alphabet. Braille Display. M OTIVATIONS. Combine past class work

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B RAILLE D ISPLAY

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  1. BRAILLEDISPLAY Katie and Kara Chylinski Advisor: Professor Hedrick March 5, 2005

  2. OUTLINE • Background • The Problem • Our Objective • Design Process • Final Design • Results • Conclusion

  3. INTRODUCTION Braille Alphabet Braille Display

  4. MOTIVATIONS • Combine past class work • Include a variety of topics • Solve a problem • Beneficial to people with disabilities • Have fun!

  5. PROJECT GOAL Concerns: inexpensive, adaptable, portable

  6. SYSTEM MODULES Convert printed page to bitmap Convert bitmap to ASCII characters Change ASCII to Braille dot pattern Send dot pattern to display unit

  7. MODULE DESIGN PROCESS • Environment: Linux • Collecting bitmap: SANE • Converting bitmap: GOCR • Driver hardware: Cynagal C8051 Microcontroller This module technique allows us to change each component.

  8. DEVELOPMENT SYSTEM Text Scanner Circuit Display Cell Microcontroller C++ Program Program Power Supply

  9. DESIGN PROCESS • Research • Compare actuators • Design sketches and performance criteria • Configure scanner and optical character recognition (OCR) • Use microcontroller and RS232 port • Program code changing ASCII to Braille • Construct driver circuit

  10. RESEARCH • Freedom Scientific • Pulse Data • ALVA • Metec

  11. ACTUATORS

  12. PERFOMANCE CRITERIA • Cell Dimensions: • Between dots: 2.54 mm • Dot height: .5 mm • Between cells: 3.75 mm • Changing speed

  13. SOLIDWORKS SKETCH

  14. DETAILED SKETCH

  15. SCANNER AND OCR • Devices • Epson SCANNER GT-8500 • GOCR 0.39 • Procedure • Scan in Text • Use Optical Character Recognition • Create “out.txt” File

  16. MICROCONTROLLER • RS232 Port • Serial Port • Data Communication Protocol • Program

  17. Linux Microcontroller SEND @ WAIT @ @ WAIT R SEND R R WAIT SEND CHAR WAIT CHAR char WAIT S SEND S S

  18. PROGRAM    // receive example: // a '1' turns LED on; a '0‘ turns LED off.   P2MDOUT = 0xff;   XBR2 = 0x40;   P2 = 0x00;   while (1) {      input_char = _getkey();          if (input_char == '@') {              putchar('R');                 //get the braille character                 input_char = _getkey();                 putchar('S');                 P2 = input_char;       }     }

  19. C++ PROGRAM • Algorithm • Set baud rate • Open output file from scanner • Read in first character • Communicate with microcontroller • Check if capital letter or number • Write to port binary sequence

  20. C ++ PROGRAM /* Change ASCII to Braille */switch (int(next)){// Lower Case Letterscase 101: case 69: // e - 010001portchar = 0x11;write(port, &portchar, 1);break;case 116: case 84: // t - 011110portchar = 0x1e;write(port, &portchar, 1);break;case 97: case 65: // a – 000001 portchar = 0x01;write(port, &portchar, 1);break;

  21. DRIVER CIRCUIT

  22. RESULTS

  23. RESULTS a

  24. RESULTS b

  25. RESULTS c

  26. TOTAL COST Scanner: $50 Microcontroller: $150 OCR software: free 6 Solenoids: $20 Circuit components: $10 Casing materials: + $20 $250

  27. SUMMARY

  28. FUTURE WORK • Finish mechanical casing • Improve scanner • Improve OCR • Run SANE from C++ program • Make portable

  29. REFERENCES http://dots.physics.orst.edu/gs_index.html http://jocr.sourceforge.net/ http://www.aagi.com/ http://www.allelectronics.com/ http://www.alva-bv.nl/alvacorp/alva_corp_home.asp http://www.askoxford.com/asktheexperts/faq/aboutwords/frequency http://www.braillenet.net/accessibilite/livreblanc/english/affbraille.html http://www.freedomscientific.com/ http://www.htwm.de/acmc/mcmodule.htm http://www.k10k.net/issues/issue059/golan/dakadaka/braille.html http://www.kgs-america.com/bc.html http://www.metec-ag.de/english.html http://www.nec-tokin.com/english/product/sekisou_e/pa_features.html http://www.pulsedata.com/ http://www.sane-project.org/ http://www.vesid.nysed.gov/lsn/stvnews/fall03.htm

  30. ACKNOWLEDGEMENTS Professor Hedrick Eugen Schäfer Roland Pierson James Howard Gene Davison Thank you!

  31. QUESTIONS? braille.union.edu

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