How to Make a Smart Cane for the Visually Impaired With Arduino
SMART BLIND STICK USING ARDUINO
How to detect if the stick has fallen in the ground from the hand of the blind person - Quora
Figure 5 from Smart cane with range notification for blind people
Camera-mounted cane helps visually impaired find objects - ASME
Robotic 'smart' cane helps visually impaired people avoid
Best Ultrasonic Sensor Projects Using Arduino
PDF) Smart Walking Stick for Visually Impaired People Using Ultrasonic Sensors and Arduino
Figure 2 from A Multidimensional Walking Aid for Visually Impaired