SYNOPSIS ON

DIVINE

Objective/ AimIn recent years, new technologies have enabled disabled persons specifically visually impaired persons (VI) to live more comfortable lives. Despite these new technologies, many of the things they do are still reliant on other people. The goal of our project team is to design a device that is easy to use, simple, and powerful enough to allow the user to perform the aforementioned tasks. Through current research, we have found that sight-impaired individuals prefer to actually go out and move independently, rather than stay home. We will constantly improve our product by designing, prototyping, and evaluating.

Figure 1: A schematic representation of the smart blind-stick ( D I V I N E )

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Thermistor

LDR

Infrared Sensor

Water Sensor

Remote Sensor

BUZZER

Technical details

In this project we show that how we modify the blind stick for blind person. We convert the normal blind stick into robotic blind stick. In this stick we use five different sensor with microcontroller interface. Here in this project we use ic 89s51 as a main microcontroller to interface the blind stick with the different sensor’s and different sound. Main part of this project is software.

SENSORS LOGIC:

In this project we use thermistor for the temperature sensor, due to excessive heat there will be small change of resistance in thermistor , this change is sense by the controller and buzzer gives a sound.

In light sensor we use LDR, ldr sense a excessive light and due to this light our circuit trigger and alarm is on , on every sensor alarm sound is different. LDR is basically use for a excessive light like, car headlight in night.

Infra red transmitter and receiver circuit , sense a interruption and when controller sense this interruption then produce a sound. Along with the infra red transmitter we use photodiode to sense a interruption and controller produce a sound.

Water sensor is simply a two conducting wire when sense a water then act automatically and produce a sound from the controller.

Remote sensor : In the remote sensor we attach one infra red eye with the circuit. This eye is a special frequency decoder eye. We use this eye in t.v receiver. This eye is respond a small signal when any remote of 36 khtz produce a signal . With the help of this eye we catch a 36 kHtz signal and then proceed to the microcontroller circuit.Any blind person wanted to locate his blind stick then first of all he have to press the remote in all direction. If the stick is in the room then eye respond with the sound buzzer.

Figure 2: Circuit diagram for smart blind stick ( D I V I N E )

Programming concept

org 0000h

our program is to be written on the 0000 location, because when the microcontroller is reset then auto reset circuit force the controller to move the program counter on 0000 location , so our first command is to be written on the 0000h location.sjmp mainour next command is sjmp main. It means that jump to the main function automatically.

main:

jnb p1.0,light jnb p1.1,fire jnb p1.2,int jnb p1.3,water jnb p1.4,remote

sjmp main

Our first work of this stick is to be monitor the all the sensor’s if there is any interruption from water, heat light or any thing then jump to specify location automatically.

for the water sensor we use two metallic plate under the stick , when water touches on this stick then buzzer is on and at this time we set a counter on for one buzzer, so buzzer rings for only one time and stop automatically. But if there is continuous water sensing then buzzer is switch on regularly.

water:clr p2.3acall delaysetb p2.3acall buzzerret

buzzer is a special function, on this function we switch on the buzzer automatically.

fire sensor: in the fire sensor we we use one thermistor with transistor circuit. When we heat the thermistor then thermistor value is to be decreased and circuit activate and buzzer is on.

fire: clr p2.1

acall delaysetb p2.1

acall buzzerret

In the light sensor we use ldr as a sensor. When light fall on the ldr then ldr shows a low resistance and due to that transistor provide a negative signal to the controller. When controller sense a negative signal on the pin then processor provide a four time buzzer sound.

light: clr p2.0

acall delaysetb p2.0

acall buzzerret

In the interruption mode we use one infra red led and photodiode in pair. If there is any object in the front of the stick then infra red light is reflected from the object and due to that photodiode gives a negative signal to the controller. When controller sense a negative signal on the pin then processor provide a five time buzzer sound.

inter: clr p2.2

acall delaysetb p2.2

acall buzzerret

buzzer:

S1: clr p2.0 ; buzzer is on acall delay setb p2.0 ; buzzer is on acall delayret

delay:

mov r0,#100 mov r1,#200 mov r2,#200sim: djnz r0,sim djnz r1,sim djnz r2,sim ret

Usefulness

It will be very useful for the persons who are visually impaired and want to be self dependent. This device will be surely in use for those who are visually impaired. It is also help for old peoples by guiding them if they are unable to find or see the problems or interruptions during their walk.

LDR input

Infrared sensor input

Remote sensor

Thermistor

Water sensor