Ultrasonic Obstacle Detection Device!

Here is our paper on our device for information and our results in testing: Ultrasonic Obstacle Detection Device | Smart Wearable Technology. 

Here is our abstract: This paper presents the design and first prototype of an Ultrasonic Obstacle Detection Device, a wearable assistive system intended to help visually impaired individuals, especially children in urban areas such as Kolkata, navigate more safely and independently. The device employs dual HC-SR04 ultrasonic sensors with a 15° field of view, positioned at a 61.325° outward angle from the device centerline to minimize blind spots, paired with two vibration motors mounted on a wrist strap to provide haptic feedback. The system is powered by a 3.7 V, 1000 mAh Li-Po battery and controlled by an Arduino Nano integrated on a custom printed circuit board. When an obstacle is detected within 3.35 m, vibration intensity increases proportionally as the object approaches, with independent left/right feedback corresponding to each sensor. Controlled experiments with blind participants demonstrated reliable direction identification, smooth vibration-distance mapping, and consistent activation thresholds. The prototype operated for approximately 25 min per charge, and participants reported that the device was intuitive and comfortable to use. Future work will focus on extending battery life, improving ergonomics, and increasing the vertical field of view.

Here is our github if you wish to create the device yourself: GitHub - SushantIndupuru/blind-assist-device · GitHub.

This work would not be possible without the help of faculty and volunteering students at the Calcutta Blind School.