DEVELOPMENT OF SMART BLIND CANE: 2013

Thursday, April 25, 2013

Presentation Day

Monday, April 15, 2013

Design and do the poster for Presentation Day

This month I design and do the poster to my project for presentation day. This poster is combination all about objective, application, methodology, diagram, description, result, benefit and conclusion.

Thursday, April 11, 2013

Demostration for this project created by myself

Monday, April 1, 2013

Result and Conclusion for project

This is flow of operation.

This is a flow of basic operation for this project. Development of smart blind cane is using ping ultrasonic sensor and voice module. PIC 16F877A will programmable the function that a cane want operate. The ultrasonic is function to send the transmitted pulse and feedback the receiver pulse to determine the distance in front. The voice module is function to feeds warning back, in the forms of voice messages and buzzer, to users.

Firstly, if there obstacle and barrier in front, and the ultrasonic sensor will send the signal to circuit microcontroller. The microcontroller read the language of c programming that flow how the PIC function to ultrasonic sensor and voice module. The cane detected by ultrasonic sensor to determine the distance of barrier in front. After that, when signal microcontroller will active a transistor drive relay circuit for switching ON the relay. This project is using two of transistor drive relay. Then, the signal is send to the voice module and feed the warning to user. The circuit will cause the relay to another transistor drive relay circuit unit switching ON to stop or cutoff the voice warning. The buzzer is use direct incoming supply between switching ON with PIC. When the distance of barrier detected, the buzzer will produced a sound. Finally, the user can communicate with users the barrier detection in front by voice alert and buzzer.

This is my finally pic for my project.

Conclusion

The main purpose of this study is to produce a prototype that can detect objects or obstacles in front of users and feeds warning back, in the forms of voice messages and vibration, to users. Combination of ultrasonic sensors and a microcontroller function for detection and distance stick and obstacles in front of. This project is to people with disabilities that are blind to facilitate the movement and increase safety.

The smart blind cane is successfully designed consistent with all the objectives achieved. The first objective is achieved by applied the programmable distance and barrier detection system ultrasonic sensor. Develop a product or hardware that can determine distance and detect barriers in front barriers. The second objective is achieved by complete the design to investigate the design smart blind cane using ultrasonic sensor, PIC, voice module and buzzer. The third objective is achieved by design to provide data on a navigation system based use ultrasonic sensor for barrier detection and studies that to help visual-impaired to move in front very well and safety navigate.

One of the most important difficulties faced by the visually challenged persons is constraints in independent mobility and navigation. They primarily use the white cane as a mobility aid allowing them to detect close by obstacles on the ground. The detection of objects above knee height is almost impossible and is a major hindrance for them. Developments in embedded systems have opened up a vast area of research and development for affordable and portable assistive devices for the physically challenged.

This project aimed at the design and implementation of a detachable unit which acts to augment the functionality of the existing white cane, to allow knee-above obstacle detection. This unit consists of an ultrasonic ranger and a vibrator controlled by a microcontroller to offer an increased detection range of three meters. The distance information is conveyed to the user through non-interfering multi-frequency vibratory stimuli, the frequency of vibration indicating the proximity of obstacles. This unit is also capable of detecting fast moving obstacles.

A lot of effort has been put in the electromechanical design of this unit conveying the vibrations effectively and ensuring that it is easily attachable on the existing white canes without sighted assistance. A crucial design optimization goal was cost the unit has been developed as a low cost device which is affordable by the poor in developing countries.

Besides that, we get the benefit for this project. This project is an automatic system that uses ultrasonic sensors to be detecting the obstacles in front by a micro controller. Adding security features for the disabled (blind). Facilitate the people with disabilities to move freely. This project will operate to help all of the blind people in the world to make them easier to walk everywhere they want. This project was done to help the blind to move in front very well.

This smart blind cane by using technology system is successfully achieving the objective. That can detect objects or obstacles in front of users and feeds warning back, in the forms of voice messages and buzzer, to users. This project is to people with disabilities that are blind to facilitate the movement and increase safety.

Monday, March 18, 2013

Programmable for C Language to final year project

This is coding for ultrasonic sensor and PIC16F877A and voice module.

#include <16f877a.h>
#use delay(clock=20000000)
#fuses hs, noprotect, nowdt, nolvp

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, parity=N)

#byte PORTA=5
#byte PORTB=6
#byte PORTC=7

#define sensor_sig PIN_C0 //Pulse trigger input

long range;
long sensor_read();

void main()
{
set_tris_a(0b00011111);
set_tris_b(0b00000000); //RB as output
set_tris_d(0b10000000);

//initialize all ports
porta=0;
portb=0;
portc=0;

do{
range=sensor_read()/10; //read ultrasonics signal

if
(range>=0&&range<=50)

{
output_high(pin_d0); // voice command
output_high(pin_d1); // buzzer
output_low(pin_d2); // voice power supply
delay_ms(3000);
output_high(pin_d2); // voice power supply

}

else if
(range>=51&&range<=100)

{
output_high(pin_d0); // voice command
output_low(pin_d1); // buzzer
output_low(pin_d2); // voice power supply
delay_ms(3000);
output_high(pin_d2); // voice power supply

}

else

{
output_low(pin_d0);
output_low(pin_d1);
output_high(pin_d2);
}

delay_ms(500); //wait 500ms

}while(1);
}

long sensor_read()
{
long time_out=0;
long sensor_cnt=0;

output_low(sensor_sig);
bit_clear(PORTC,0);
delay_ms(100);
output_high(sensor_sig); //send a pulse out
delay_us(5); //for 5us
output_low(sensor_sig); //stop sending
delay_us(600); //wait for 600us
bit_set(PORTC,0);

//wait for feedback
do{
time_out++;
delay_us(1);
}while(time_out!=400 && input(sensor_sig)==0);

//start count pulse
if(time_out!=400)
{
do
{
sensor_cnt++;
delay_us(1);
}while(sensor_cnt!=20000 && input(sensor_sig)==1);
delay_us(200);

if(sensor_cnt==20000){
return(0);
}else{
return(sensor_cnt);
}
}
else
{
return(0);
}
}

Monday, March 11, 2013

Drawing and Design a Method Implement Flowchart and Diagram

This is circuit implement flowchart for this project.

Flowchart Explanation

1. Method Finding

It was done after project briefing since the first week. We had find out multiple choices of method that smart blind cane use to detect distance and barrier in front. As we can see, there are many type of ultrasonic sensor in the world.

2. Method Analysis

The method to construct circuit achieved either from the thesis, journal, magazine, internet and electronics shop. It is necessary to analysis beforehand to ensure it is really practically. During analyzing, the types of method have been decided by comparison and reasonable facts and factors.

3. Calculation Analysis

Once the method has been decided, all the required calculation analysis must being done. It is because to find the actual torque that can be driven with the load. The parameter of the ultrasonic sensor just measure with calculation the distance.

4. Construct Circuit

In this part, the circuit involved only PIC, ping ultrasonic sensor and voice module circuit. In my part, the controller circuit is designed by the combination of ultrasonic sensor circuit and voice module circuit on the controller. This is very important circuit to setup the cut-off the controller of the cane. All the circuit that we design has its own relay. We put the relay on each circuit it is because easy to us troubleshot the circuit if the circuit does not function.

5. Circuit Testing

Was done after us soldering each circuit and determine circuit functionality. Proceed with the troubleshooting and reconstruct to recognize the problems.

6. Troubleshooting

This step took the most time in entire project execution. It may cause to reconstruct disolder and resolder. We are doing the troubleshooting mostly on sensor circuit and the voice module.

7. Circuit Installation

Finally, the complete circuit was installed in the casing. It also required some modification to fit the circuit and to make sure it is functioning with efficiency.

This is a diagram for this project of Smart Blind Cane.