lalitha ppt
TRANSCRIPT
VELAGAPUDI RAMAKRISHNA SIDDHARTHA ENGINEERING COLLEGE
ELECTRONIC SAFETY ASSITANCE FOR BLIND USINGMICROCONTROLLER AND DSP VOICE PROCESSER
PRESENTTED BYG.LALITHA
ABSTRACT
The main of aim this application is to providing assistance for the blind people against obstruction. The blind people has to wear the equipment, the equipment transmits IR communication code into the free space. The reflected IR communication code received by the same microcontroller. The reflection is take place and it’s give a voice response at the equipment
INTRODUCTION
In order to help the blind people to reach their destination
safely this equipment is designed.
The application is designed using the microcontroller and dsp
voice processor to assist the blind people. Hence the
application is given the name “Electronic safety assistance
for blind using microcontroller and dsp voice processor”.
Micro-Controller MCS51 Series, 89C52 IR Transmitter IR Receiver Buzzer DSP voice processor
THE MAIN COMPONENTS USED IN THIS APPLICATION
BLOCK DIAGRAM
DSP Voice Processor
DSP VOICE PROCESSOR
CRITERIA FOR CHOSSING AT89C52 MICROCOMTOLLER
• The AT89C52 is a low power ,high performance cmos 8 bit Microcontroller with 8K bytes of in-system programmable flash memory. The device is manufatured using atmel’s high density nonvolatile memory Technology.
• AT89C52 is a powerful microcontroller that provides a highly flexible and Cost effective solution.
MICROCONTROLLER DESCRIPTION
It supports the two software selectable power saving modes one is ideal mode and other is power down mode 32 Programmable I/O Lines.Three 16-bit Timer/Counters.Eight Interrupt Sources.It has 256 bytes of internal RAM.
IR TRANSMITTER AND IR MODULATOR
IR led is used as the IR transmitter. IR modulator is an astable multivibrator Generates
35KHz frequency while receiving bit0 from TDX of the microcontroller.
TDX pin of the microcontroller generates 35KHz IR frequency, the frequency is emitted by the IR led with help of driver transistor.
IR LED
Infrared emitting diode is a high intensity diode, molded in a blue transparent plastic package.
A light-emitting diode (LED) is a semiconductor light source. When a light-emitting diode is forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence.
Infrared LEDs are also used in the remote control units of many commercial products including televisions, DVD players, and other domestic appliances.
For infrared LED’s, the light output is not visible by our eyes, but can be sensed by a variety of electronic devices
IR RECEIVER CONNECTED TO MICROCONTROLLER
The receiver is having IR photo diode and IR processing comparator Opamp.
It has 3 pins one is connected to gnd, other is vcc, 3rd pin is data pin.
The data received at RDX pin of the microcontroller converts into Parallel subsequently stores in serial buffer.
DSP VOICE PROCESSOR APR9301 V2
The APR9301 device offers true single-chip solid-state storage capability and requires no software or microcontroller support.
It provides high-quality recording and playback with a single 20- to 30-second message
Low power consumption User-friendly, easy-to-use operation
OPERATING MODES
There are four operating modes in the
APR9301 V2 voice processor.
They are:
Record Mode (Level-Activated)
Playback Mode (Edge-Activated)
Standby Mode (/CE = "0")
Power Down Mode (/CE = "1")
BUZZER
• A buzzer or beeper is a signaling device, usually electronic, typically used in automobiles, household appliances
ADVANTAGES
Advantages:
• As IR transmitter and receiver are inexpensive• Power consumption is very low• The equipment is less in size, hence it can be easily carried
FUTURE SCOPE
The IR rays are not omnidirectional. They exhibit line of sight property. Due to this reason the person can only identify the obstruction that is straight to him. Inorder to cover the entire region surrounding the person the system can be developed using RFID transmitter and can be used more effectively in future.
FLOWCHART
CONCLUSION
In this work the methodology of detecting any obstruction
is described. The application helps in providing assistance for the
blind people against the obstruction. Whenever it detects the
object, it intimates the user through voice processor and the
buzzer.
REFERENCES
http://www.maxim-ic.com http://www.atmel.comhttp://www.wikipedia.orghttp://www.google.co.inhttp://www.ehow.comhttp://www.8051projects.nethttp://www.keil.com
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THANK YOU