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  • Author Author: rpiloverbd
  • Date Created: Date Created
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Blind Stick

rpiloverbd
Blind Stick

I have made a simple blind stick. This can be helpful to blind people. I have used a SONAR sensor, an Arduino UNO, some jumper wires and a buzzer.

Arduino UNO is the brain of this project. The SONAR sensor  and a buzzer is connected to the arduino UNO. The Arduino takes reading from the SONAR sensor

When the nearest obstacle is less than  25 cm away,  the Arduino makes the buzzer pin High. The buzzer starts making a sound.  Thus the user can be alert and alter their way. I attached the circuit to a white stick-like thing that was available at home.

Parts list

Arduino UNO x 1 

HCSR04 SONAR sensor x 1

Buzzer x 1

Walking Stick x 1 

Jumper wires

Double sided tapes

Connection: 

Arduino UNO SONAR Sensor
VCC VCC
GND GND
Trig 2
Echo 3

Arduino Uno Buzzer
11 +
GND -

Code

#define trigPin 2
#define echoPin 3
#define buzzerPin 11

// Define variables:
float duration=0.00;
float distance=0.00;

void setup() {
  // Define inputs and outputs:
  pinMode(trigPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  //Begin Serial communication at a baudrate of 9600:
  Serial.begin(9600);
}

void loop() {
  // Clear the trigPin by setting it LOW:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Trigger the sensor by setting the trigPin high for 10 microseconds:
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, pulseIn() returns the duration (length of the pulse) in microseconds:
  duration = pulseIn(echoPin, HIGH);
  // Calculate the distance:
  distance = duration /58.82 ;

  // Print the distance on the Serial Monitor (Ctrl+Shift+M):
  Serial.print("Distance = ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(1000);
  if(distance<=25)
  {
    digitalWrite(buzzerPin ,HIGH);
  }

  else
  {
    digitalWrite(buzzerPin ,LOW);
  }
}

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