Saipriya
Created September 4, 2024

Portable Wearable Navigation Device for Visually Impaired

One major problem for individuals with visual impairments is the inability to independently navigate through unfamiliar environments.

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Portable Wearable Navigation Device for Visually Impaired

Things used in this project

Hardware components

nRF52 Development Kit
Nordic Semiconductor nRF52 Development Kit
×1
nRF52840 Multi-Protocol SoC
Nordic Semiconductor nRF52840 Multi-Protocol SoC
×1
ESP32S
Espressif ESP32S
×1
Arduino UNO
Arduino UNO
×1
Grove - Ultrasonic Ranger
Seeed Studio Grove - Ultrasonic Ranger
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

Portable Wearable Navigation Device for Visually Impaired Individuals Using Ultrasonic Sensors and a

C/C++
1. Circuit Assembly:
o Connect the HC-SR04 ultrasonic sensor to the Arduino as described in the circuit diagram.
o Connect the vibration motor to the Arduino using a current-limiting resistor.
o Ensure all connections are secure and accurate.
2. Uploading Code:
o Open the Arduino IDE on your computer.
o Copy and paste the provided code into a new sketch.
o Connect the Arduino to your computer via USB.
o Select the appropriate board and port in the Arduino IDE.
o Upload the code to the Arduino.
3. Testing:
o Power the Arduino and observe the serial monitor for distance readings.
o Place objects at various distances from the sensor to test the vibration feedback.
o Adjust the nearThreshold value if necessary to suit your specific requirements.
// Define pins for the HC-SR04 ultrasonic sensor
const int trigPin = 9;
const int echoPin = 10;

// Define pin for the vibration motor
const int motorPin = 8;

// Define distance thresholds (in centimeters)
const int nearThreshold = 20;   // Distance at which the motor starts vibrating

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Set pin modes
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(motorPin, OUTPUT);

  // Ensure motor is off initially
  digitalWrite(motorPin, LOW);
}

void loop() {
  // Send a pulse to trigger the sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo pin and calculate the distance
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2; // Speed of sound is 0.034 cm/us

  // Print distance for debugging
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Check if distance is within the threshold
  if (distance > 0 && distance <= nearThreshold) {
    // Turn on the vibration motor
    digitalWrite(motorPin, HIGH);
  } else {
    // Turn off the vibration motor
    digitalWrite(motorPin, LOW);
  }

  // Short delay before next reading
  delay(100);
}

Credits

Saipriya

Saipriya

1 project • 1 follower

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