Smart Blind Stick – Arduino Uno R3

A smart blind stick project built with Arduino Uno R3 that helps visually impaired users by detecting obstacles and giving feedback using sensors, buzzer, and LED.

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Initial build of the connection:

🛠 Components Used

• Arduino Uno R3
• Ultrasonic Sensor (HC-SR04)
• IR Sensor Module
• LDR (Light Dependent Resistor) + 10kΩ resistor (voltage divider)
• Buzzer (Active or Passive)
• LED + 220Ω resistor
• Jumper wires & breadboard
• 9V DC Battery (Power Supply)
• SPDT Slide Switch (for power control)

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⚡ Circuit Connections

Ultrasonic Sensor (HC-SR04)

• VCC → 5V
• GND → GND
• Trig → D9
• Echo → D10

Buzzer

• + → D8
• – → GND

IR Sensor

• VCC → 5V
• GND → GND
• OUT → D7

LDR (via voltage divider with 10kΩ resistor)

• One leg → 5V
• Other leg → A0 & 10kΩ resistor → GND

LED

• Anode (+) → D6 (through 220Ω resistor)
• Cathode (–) → GND

SPDT Slide Switch

• Common (C) → Battery +
• ON1 → Arduino VIN (or 5V rail if regulated)
• Battery – → Arduino GND

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🔋 Power Supply

• Powered using a 9V battery through the SPDT switch.
• All sensors and modules share a common GND.

💡 Tip: For better runtime, use a USB power bank or 6×AA battery pack instead of a 9V PP3 battery.

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🚀 Features

• Detects obstacles using ultrasonic sensor (distance-based alerts).
• Buzzer alerts and LED indicators for feedback.
• IR sensor helps detect closer objects quickly.
• LDR checks light intensity for day/night detection.
• Portable, lightweight, and battery-powered.

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📸 Suggested Diagram

• Block diagram showing connections between Arduino, sensors, buzzer, and LED.
• (Optional: include a Fritzing diagram or wiring schematic for clarity.)

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✅ Future Improvements

• Add vibration motor for haptic feedback.
• Implement left/right obstacle detection using dual ultrasonic sensors.
• Add low-battery monitoring with a voltage divider to an analog pin.

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📜 License

This project is open-source under the MIT License.
Feel free to use, modify, and share.

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