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arduino-blind-stick-b3157a-en.md

Assistive Tech: The Smart Blind Stick

The Arduino Blind Stick is a powerful example of how makers can build technology that improves lives. This project upgrades a traditional white cane by adding "echo-location" capabilities to warn the user of obstacles at chest or head height.

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How It Protects

  1. Distance Measurement: An HC-SR04 ultrasonic sensor is mounted on the stick, pointing forward and slightly upward.
  2. Feedback Loop: As the user walks, the Arduino constantly calculates the distance to the nearest object.
  3. Alerts: If an object is detected within 1 meter, the Arduino triggers a Piezo Buzzer and a Vibration Motor.
  4. Intensity: As the object gets closer, the beeping or vibration gets faster, just like a car's reverse parking sensor.

Hardware Setup

  • Arduino Nano or Pro Mini: Must be small to fit inside the stick handle.
  • HC-SR04 Ultrasonic Sensor: The "eyes" of the stick.
  • Piezo Buzzer: For audio alerts.
  • Coin Vibration Motor: For silent, tactile alerts.
  • Rechargeable Battery: Such as an 18650 Li-ion cell.

Impact

This project teaches you how to map sensor data to pulse width modulation (PWM) to create variable-intensity alerts, and it's a great introduction to the ethics and design of assistive technologies.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Arduino Blind Stick"
description: "Build an assistive device! Combine an ultrasonic sensor and a buzzer to create a smart walking stick that helps visually impaired people detect obstacles."
category: "Health & Wellbeing"
difficulty: "Intermediate"