This document describes a seminar presentation on a sign language recognition system for deaf and dumb people. The system uses a microcontroller, flex sensors to detect hand gestures, an ADC to convert analog sensor signals to digital, and a voice processor and speakers to provide audio output of the recognized sign. It recognizes several letters and displays them on an LCD. Potential applications include improving communication for deaf individuals and future work could expand its capabilities.

1. DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
JOGINPALLY B. R. ENGINEERING COLLEGE
2014-2015
Seminar
On
SIGN LANGUAGE RECOGNITION FOR DEAF AND DUMB PEOPLE
Bachelor of Technology
In
Electronics & Communication Engineering
Under the esteemed guidance of
Prof. V.SriRam
B.E, M.tech
Presented by
A.Vasavi (11J21A0407)
B. Sushma Rani (11J21A0411)
M. Ramya (11J21A0457)

2. CONTENT
1. Introduction
2. Block diagram
3. Individual block description
4. Results
5. Advantages & Disadvantages
6. Applications
7. Conclusions & Future scope
8. References

3. INTRODUCTION
1.1. Aim:
Deaf and dumb people use sign language for their communication but it was
difficult to understand by the normal people. The aim of this project is to reduce the
barrier between them.
Sign language recognition system works on an algorithm for recognition of
hand gestures with accuracy. Depending on the hand motions the output will be
displayed on the LCD and also played through the speaker.

4. Block Diagram Of Sign Language Recognition For Deaf And
Dumb People

5. INDIVIDUAL BLOCKS
The block diagram mainly consists of
1) Power supply:
It activates all the electronic equipments in the digital circuits required

6. INDIVIDUAL BLOCKS
2) Microcontroller:
It is a chip through which we can connect many other devices and also those
are controlled by the program which burn into the chip.
• 8KB on-chip program memory.
• 128 bytes on-chip data memory.
• 4 register banks.
• 32 bidirectional I/O lines organized as four 8 bit ports.
• Two multi mode 16 bit Timer/Counters.
• 8 interrupts.
A
T
8
9
S
5
2

7. INDIVIDUAL BLOCKS
3) LCD (LIQUID CRYTAL DISPLAY)
A LCD is a flat panel display, electronic visual display or video display that
uses the light modulate. We are using 16×2 LCD display for our project.
16×2
LCD DISPLAY

8. INDIVIDUAL BLOCKS
4) Flex sensors
Flex sensors are sensors that change in resistance depending on the amount of
bend on the sensor. They convert the change in bend to electrical resistance-the
more the bend, the more the resistance value. They are usually in the form of a thin
strip that vary in resistance.

9. INDIVIDUAL BLOCKS
5) ADC (Analog to Digital converter)
An analog-to-digital converter (ADC) is a device that converts a continuous
physical quantity to a digital number that represents the quantity's amplitude.
The MCP3208 is a 12bit, 8 channel, Serial Peripheral Interface (SPI) Analogue to
Digital Converter. It comes as an 16 pin DIP.

10. INDIVIDUAL BLOCKS
6) MAX232
The MAX232 is an integrated circuit that converts signals from an RS-
232 serial port to signals suitable for use in TTL compatible digital logic circuits.
The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and
RTS signals.
 It has 16 pins
 Operates Up To 120 kbit/s
 Low Supply Current . . . 8 mA
 Operates From a Single 5-V Power Supply

11. INDIVIDUAL BLOCKS
7) Voice processor:
Voice processor is used to record audio and playback. We are using
APR33A3 IC.

12. INDIVIDUAL BLOCKS
8) Speakers :
Speakers are one of the most common output devices used with computer
systems. Speakers are transducers that convert electromagnetic waves into sound
waves.

13. INDIVIDUAL BLOCKS
9) Zigbee module
ZigBee is a technology of data transfer in wireless networks. It has low
energy consumption and is designed for multi-channel control systems, alarm
systems, and lighting control. ZigBee is more economical than Wi-Fi while
Bluetooth protocol also consumes more energy and has a greater scattering of
parameters of conventionally compatible units. This is caused by the fact that
Bluetooth does not have a unified data transfer standard. Still that does not mean
that ZigBee is oriented towards autonomous use.

14. RESULTS
Transmitter Section of sign language recognition system kit when power supply is OFF

15. RESULTS
Receiver Section of sign language recognition system kit when power supply is OFF

16. RESULTS
Transmitter Section of sign language recognition system kit when power supply is ON

17. RESULTS
Receiver section of sign language recognition system kit when power supply is ON

18. RESULTS
Initial LCD Display of transmitter section of sign language recognition system kit

19. RESULTS
Initial LCD display of receiver section of sign language recognition system kit

20. RESULTS
Displaying Alphabet A

21. RESULTS
Displaying Alphabet B

22. RESULTS
Displaying Alphabet C

23. RESULTS
Displaying Alphabet D

24. RESULTS
Displaying Alphabet E

25. RESULTS
Displaying Alphabet F

26. RESULTS
Displaying Alphabet G

27. RESULTS
Displaying Alphabet H

28. ADVANTAGES AND DISADVANTAGES
a) Advantages:
 Eliminates the need of interpreter.
 Easy to incorporate and execute in any supporting operating system.
b) Disadvantages:
 System is trained on a limited database.
 Possibility of misinterpretation for closely related gestures.

29. APPLICATIONS
 Web conferences
 Domestic applications
 Wearable computers

30. CONCLUSIONS & FUTURE SCOPE
• Conclusions:
Thus we can conclude that sign language recognition for deaf and dumb
people helps to communicate easily between normal people and deaf and dumb
people.
• Future scope:
Sign language recognition system can be implemented in many application
areas examples include accessing government websites whereby no video clip for
deaf and dumb is available or filling out forms online whereby no interpreter may
be present to help.