This project helps in simplifying the process of learning of braille instructions. The integration of physical activity and hearing can facilitate easy learning of Braille Script. In this project we develop a kit which helps the blind and visually impaired people to learn braille even in the absence of teachers.
Braille literacy is crucial for blind individuals, as it enables life-long learning and is key to employment and independency. One way to promote Braille literacy is to make existing Braille reading devices more accessible, affordable, and user friendly. Commercially available Braille reading devices in this regard need various improvements. Most of these devices cost thousands of dollars, mainly because they rely on multiple piezoelectric actuators in order to create the Braille letters.
Other issues include high voltage actuation and reduced portability. In order to solve these issues and improve existing Braille displays, various actuation methods have been widely investigated.285 million people are estimated to be visually impaired worldwide, 39 million are blind and 246 have low vision. India has the largest population of blind people in the world. That's over 12 million people. Even the central and state government provide job opportunities for blind and visually impaired people. But only few vacancies are filled due to lack of education. Lack of education for blind people is due to the lack of qualified teachers to teach them Braille. Learning the Braille script is not an easy task for Visually Impaired students. Visually Impaired students have to memorize various patterns of keys of Braille matrix assigned for different letters/words/symbols in Braille script to read and write effectively.
Table of Contents
CHAPTER 1
1.1 BLOCK DIAGRAM
1.2 ABOUT BARILLE
1.3 BRAILLE STRUCTURE
1.4 IMPORTANCE OF BRAILLE
1.5 BRAILLE IN DAY TO DAY LIFE
1.6 BRAILLE SYMBOLS
1.6.1 THE BRAILLE ALPHABET
CHAPTER 2
LITERATURE SURVEY
CHAPTER 3
HARDWARE DESCRIPTION
3.1 Raspberry Pi 3 Model B
3.1.1 PINDIAGRAM
3.2 SOLENOID ACTUATOR
3.3 TRANSISTOR TIP122
3.4 DIODE 1N4007
3.5 RESISTOR 1K
CHAPTER 4
POWER SUPPLY DESCRPITION
4.1 7812 REGULATOR
4.2 CAPACITOR 470uF
4.3 TRANSFORMER
4.4 REGULATED POWER SUPPLY WORKING
4.4.1 THE POSITIVE HALF-CYCLE
4.4.2 THE NEGATIVE HALF-CYCLE
CHAPTER 5
5.1 CIRCUIT DIAGRAM OF CONTROL UNIT
5.2 CIRCUIT EXPLANATION
5.2.1 OPEN CIRCUIT CONDITION OF SOLENOID ACTUATOR
5.2.2 CLOSED CIRCUIT CONDITION OF SOLENOID ACTUATOR
5.3 CIRCUIT DIAGRAM OF POWER SUPPLY
5.3.1 IC 7812
5.3.2 CAPACITOR
CHAPTER 6
TEXT TO VOICE SYTHESIS
6.1 INTRODUCTION
6.2 SOFTWARE PACKAGES
6.2.1 FESTIVAL
6.2 2 FLITE
6.2.3 Espeak
6.3 AUDIO CONFIGURATION
6.3.1 DESKTOP VOLUME CONTROL
6.3.2 COMMAND LINE
6.3.3 RASPI-CONFIG
6.4INSTALLATION FLITE PACKAGAE
CHAPTER 7
TECHNICAL CHANLLENGES ENCOUNTERED DURING THE BRAILLE SYSTEM DESIGN
7.1 POWER SUPPLY DESIGN
7.2 BRAILLE CHARACTER SIZE
7.3 ADVANTAGES OF THE BRAILLE KIT
Project Goals and Themes
The primary goal of this project is to develop an affordable, self-learning Braille instructional kit for blind and visually impaired individuals. By utilizing a Raspberry Pi and solenoid actuators, the project seeks to simplify the learning of the Braille script, allowing users to practice effectively without the constant presence of a qualified teacher.
- Development of an electronic Braille teaching aid.
- Implementation of hardware control using Raspberry Pi.
- Integration of text-to-speech synthesis for multi-sensory learning.
- Design of a cost-effective solenoid-based Braille display.
- Addressing educational gaps for visually impaired students.
Excerpt from the Book
1.2 ABOUT BARILLE
Braille is named after its creator, Frenchman Louis Braille, who lost his eyesight due to a childhood accident. Braille was invented in 1824, the simple dot system is still considered by many people as the best reading system for blind people. It is a brilliant tool for communicating and participating in society. Braille is a tactile writing system used by people who are blind or visually impaired. It is traditionally written with embossed paper. Braille is a system of raised dots that can be read with the fingers by people who are blind or who havelow vision. Braille is not a language. It is a code by which all languages can be written and read. Through the use of Braille, people who are blind are able to review and study the written other word. It provides a passport for literacy and gives an individual the ability to become familiar with spelling, punctuation, paragraphing and formatting considerations.
Summary of Chapters
CHAPTER 1: Introduces the Braille system, its history, structural basics, and its vital importance in the daily life and education of blind individuals.
CHAPTER 2: Reviews existing literature and projects related to refreshable Braille displays and educational aids for the visually impaired.
CHAPTER 3: Details the hardware components used in the project, specifically the Raspberry Pi 3 Model B and various electronic actuators and switches.
CHAPTER 4: Explains the design and working principle of the regulated power supply required to drive the solenoid actuators.
CHAPTER 5: Describes the circuit configuration and the control logic implemented to trigger the solenoid actuators for forming Braille patterns.
CHAPTER 6: Covers the software implementation for text-to-voice synthesis and audio configuration on the Raspberry Pi platform.
CHAPTER 7: Discusses technical challenges encountered during design, specifically regarding power requirements and Braille character sizing, and lists the advantages of the kit.
Keywords
Braille literacy, Raspberry Pi, solenoid actuator, visually impaired, Braille display, text-to-speech, educational aid, hardware design, electronic circuit, Braille cells, NPN transistor, power supply, assistive technology, tactile writing system, self-learning.
Frequently Asked Questions
What is the fundamental purpose of this work?
The work aims to create an affordable Braille learning kit that enables visually impaired individuals to learn the Braille script independently without needing a human teacher.
What are the central thematic fields?
The project focuses on assistive technology, embedded systems design (Raspberry Pi), hardware engineering for tactile displays, and software-based speech synthesis.
What is the primary research goal?
The goal is to develop a low-cost, portable, and effective electronic tool that simplifies the learning process for reading and writing Braille.
Which scientific methods are utilized?
The project utilizes an experimental design approach, involving system integration of electronic components, software coding in Python for hardware control, and comparative studies for component selection.
What does the main body cover?
The main body covers hardware specifications, power supply circuit design, solenoid actuation mechanisms, audio configuration for speech synthesis, and the overall integration of the Braille kit.
Which keywords characterize the work?
Key terms include Braille literacy, Raspberry Pi, solenoid actuator, assistive technology, and electronic educational aids.
How does the system physically represent Braille characters?
The system uses solenoid actuators that move a small iron rod to create tactile Braille dots, simulating the patterns required for different letters and numbers.
What is the role of the Raspberry Pi in this project?
The Raspberry Pi acts as the central processor that runs the Python code, manages GPIO signals to trigger actuators, and handles text-to-speech synthesis.
Why are text-to-speech packages included?
These packages are included to provide auditory feedback, enhancing the learning experience by allowing the user to hear the characters they are feeling on the Braille display.
- Citation du texte
- Saranya Karunamurthi (Auteur), 2018, Braille Learning System using Raspberry Pi, Munich, GRIN Verlag, https://www.grin.com/document/440197
