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Team Drishti, S.V.N.I.T

Jyoti,

A light for the blind

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The 5WH Technique : WHAT AND WHO

  • What and Who

BRAILLE PRINTER =

BRAILLE + PRINTER

  • System of raised DOTS
  • Not a LANGUAGE

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  • Any system having the ability to EMBOSS with the desired characteristics.

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The 5WH Technique : WHERE

  • Where do we need it:

Braille labels on food, DVDs, receipts or bills ,tactile graphics ,pharmaceutical packaging, legal paperwork, taking and giving personal note, school assignments and studying menus, lift buttons, warning signs, household objects, novels, Document submissions and on and on and on and on and............

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The 5WH Technique : WHY

  • Why do we need it:

IF

THEY ARE ALREADY THERE

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Ans: Because..................................

  • Qualitatively
  • Quantitatively: An estimated 15 million blind people live in India. Every year 2 million blind children in India. Only 5% of them receive any education.

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The 5WH Technique : WHY

  • Poverty statistics:
  • Price of Braille in Market:

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  • THE 1 RUPEE PEN STORY.

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HENCE THE IMBALANCE

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The 5WH Technique : WHEN and HOW

  • When :

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  • HOW:

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An Overview of the PRESENT

  • Anne Tailor works at NBF :

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  • price range(1.2 lakhs START)
  • Noise avoidance(very noisy 80DB : permanent damage after only 1 work day (8 hours).)
  • weight(5.5 kgs to 136 kgs)
  • fast(10 to 800 CPS)
  • customer service(How Sturdy)

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Why ours..??

What do we have now:

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A LITTLE HISTORY

2-D PLOTTER : A GLIMPSE

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The video here : with max speed

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Technological Aspect

  • Understanding the Grade 2 Braille or the English Braille:

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Technological Aspect

  • So as explained in previous slide braille language is in form of 2X3 matrix so that there is 2^8=64 combination is available.
  • To get that 64 combination we divide our whole character in 2 parts

as a form of two octagon.

To select the right combination from octagon we choose stepper motor BYJ48 that rotate in predetermined angle and character is selected

  • so this is our punching module.

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Technological Aspect

  • To emboss our punching module we tried a lot of things then we decide to use temporary pneumatic actuator.

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Technological Aspect

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Technological Aspect

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Technological Aspect

  • Printing a whole page we want motion in X and Y direction.
  • For motion in X direction we use step belt drive system with stepper motor Nema17 so that we choose our position of punching module in X direction
  • For motion in Y direction in place of moving the whole punching assembly we move the paper platform in Y direction
  • For this we use slider along with rack and pinion mechanism and we use stepper motor nema 17 to get the desire position

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BRAILLE PRINTER-ELECTONICS COMPONENTS

  • Materials:-
  • 1. NEMA17 Stepper motor
  • 2. BYJ48 stepper motor
  • 3. DVR8825 motor driver for NEMA17
  • 4. ULN2803 motor driver for BYJ48.
  • 5. Arduino Uno

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  • NEMA17:-
  • Steps/rev=200
  • Torque=4.4 Kg-cm
  • Weight=0.28 Kg
  • Current rating=1A / phase
  • RPM=

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  • BYJ48
  • Steps/rev=4096
  • Torque=0.3 Kg-cm
  • Weight=0.036 Kg
  • Current rating=0.5A
  • RPM (Our requirement)=17

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BRAILLE PRINTER-ELECTONICS COMPONENTS

  • DRV8825
  • Operating Voltage=8.2V to 45V (We used 12 V)
  • Maximum current=2.5A at 24V from each output
  • A low-power sleep mode is included which allows the system to save power when not driving the motor.

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  • ULN2803
  • Operating Voltage=12V
  • Maximum Current=0.5A per output

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HOW WE REACHED HERE?

  • Two BYJ48 motors are used to rotate 2 octagons(one each).
  • Slider mechanism and Belt drive use one NEMA17 each
  • Two NEMA17 are used in punching mechanism
  • 2 octagons are rotated using 2 BYJ48 motors as per the input from the user.
  • These combinations were set in switch statement of the code discreetly for 0-9, a-z and A-Z.
  • After the required combination is obtained, the punching mechanism comprising of 2 NEMA17 starts working. It presses the octagons on the braille paper below to emboss the required combination of dots and then lifts it back up to its original position. After it is back to original position, the octagons are rotated to bring them back to their original position.
  • After printing one character, one NEMA17 is used to move the belt drive mechanism to take the printing head to new position to print next character.
  • After completion of one line, the printing head is moved to its original position, from where it started printing, and the slider mechanism moves the paper upward by some distance to using NEMA17 to start printing a new line.

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CALCULATIONS

  • Speed Calculation/Actuation mechanism Speed

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  • Cost calculation

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  • Noise calculation

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  • Weight calculation

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Start

Manual Input

OCR Input

Storage in GUI

Storage in file

Read one character per cycle

Begin new line from left to right

Rotate octagons according to the input

Is this last character of line

No

Is this last character of input

No

Use belt mechanism for next character

Yes

Stop

Paper feed mechanism

Yes

ALGORITHM OF CODE

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Future aspects

  • Speed Calculation/Actuation mechanism Speed

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  • Cost calculation

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  • Noise calculation

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  • Weight calculation

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THANK YOU