Visually impaired individuals face significant challenges in navigating urban environments with a high density of obstacles. This study presents the development and evaluation of a functional prototype of an ultrasonic smart cane designed to enhance user safety and autonomy. Using ultrasonic technology, the cane detects obstacles at distances of up to 100 cm, emitting real-time auditory alerts. Evaluated through laboratory and field tests with real users, the prototype demonstrated high precision in obstacle detection and quick responses, facilitating navigation in complex environments. Key improvements were identified, such as moisture protection and size adjustments for different users. Future developments could include integrating Bluetooth connectivity to expand the device’s functionalities. The results suggest that the ultrasonic smart cane can be a valuable tool for improving the quality of life of visually impaired individuals, providing an accessible and practical solution for independent mobility.