Published March 2, 2017 © CC BY-NC-SA

Smart Cap

Good vision is a precious gift but unfortunately loss of vision is becoming common now-a-days. Smart cap can help with navigation.

IntermediateFull instructions provided4 hours12,472

Things used in this project

Hardware components

SparkFun Arduino Pro Mini 328 - 3.3V/8MHz

Ultrasonic Sensor - HC-SR04 (Generic)

Buzzer

Mobile phone vibrator

3.7 V LiPo Battery

Story

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Good vision is a precious gift, but unfortunately loss of vision is becoming common these days. Blindness may result from a disease, injury or other conditions that limit vision, and because of this, blind people confront a number of challenges everyday. Navigation is one of them. And the solution is the Smart Cap - it helps with navigation.

Step 1: List of materials

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Arduino x1 (I had used the Uno Pro Mini as recommended)

Ultrasonic sensor x3

Mobile phone vibrator x2

Small Buzzer x1

Power source for the Arduino

Step 2: Schematics

The ultrasonic sensors have 4 pins each:

Trig

Echo

Connect all the Vcc and GND pins of all the sensors to the Arduino Vcc and GND pins.

Sensor 1

Trig Pin 1 ---- Arduino A0

Echo Pin 1 ---- Arduino A1

Sensor 2

Trig Pin 2 ---- A2

Echo Pin 2 ---- A3

Sensor 3

Trig Pin 3 ---- A4

Echo Pin 3 ---- A5

Left vibrator

Vcc ---- Arduino Pin 5 (left sensor is 2)

GND ---- GND

Right vibrator

Vcc ---- Arduino Pin 6 (right sensor is 3)

GND ---- GND

Buzzer

Vcc ---- Arduino Pin 3

GND ---- GND

Step 3: Code

If you want to increase range, you can simply change the distance in the code at this part: If (distance < 45)

Step 4: Arrangement of sensors

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Place sensor 1 at the front part of the cap.

Sensor 2 at the left side of the cap.

Sensor 3 at the right side of the cap.

Place the vibrators in left and right sides of the cap.

Step 5: Video

Step 6: Conclusion

The only drawback of the cap is that it can sense the objects only at the height range of the sensors. If you want, you can make something like a smart shoe; I am currently working on it and want to improve it using Open CV, Raspberry Pi and Microsoft.

Hope you guys like this project. If you like it, don't forget to vote my project. Thank you!

If you have any inquiries, feel free to ask in the comment section!

FIZZQV0IZ6D1PFF.ino

#define trigPin1 A0
#define echoPin1 A1

#define trigPin2 A2
#define echoPin2 A3

#define trigPin3 A4
#define echoPin3 A5


#define motor1 5
#define motor2 6
#define buzzer 3

void setup()
{
pinMode(trigPin1, OUTPUT);

pinMode(echoPin1, INPUT);

pinMode(trigPin2, OUTPUT);

pinMode(echoPin2, INPUT);

pinMode(trigPin3, OUTPUT);

pinMode(echoPin3, INPUT);


pinMode(motor1, OUTPUT);

pinMode(motor2, OUTPUT);

pinMode(buzzer,OUTPUT);

}

void loop()

{

long duration, distance;

digitalWrite(trigPin1, LOW); 

delayMicroseconds(2); 

digitalWrite(trigPin1, HIGH);

delayMicroseconds(1); 

digitalWrite(trigPin1, LOW);

duration = pulseIn(echoPin1, HIGH);

distance = (duration/2) / 29.1;

if (distance < 45)

{ 

 

digitalWrite(buzzer,HIGH);

} else

{



digitalWrite(buzzer,LOW); 

} delay(50);



digitalWrite(trigPin2, LOW); 

delayMicroseconds(2); 

digitalWrite(trigPin2, HIGH);

delayMicroseconds(1); 

digitalWrite(trigPin2, LOW);

duration = pulseIn(echoPin2, HIGH);

distance = (duration/2) / 29.1;

if (distance < 40)

{ 

digitalWrite(motor1,HIGH);



} else

{

digitalWrite(motor1,LOW);

 

} delay(100);




digitalWrite(trigPin3, LOW); 

delayMicroseconds(2); 

digitalWrite(trigPin3, HIGH);

delayMicroseconds(2); 

digitalWrite(trigPin3, LOW);

duration = pulseIn(echoPin3, HIGH);

distance = (duration/2) / 29.1;

if (distance < 30)

{ 

digitalWrite(motor2,HIGH); 

} else

{

digitalWrite(motor2,LOW);

 

} delay(100);

}