Due to the limitation of walking stick that cannot detect the objects that have edges but hollow at below height such as table and splashboard, there is an idea to solve this problem by using ultrasonic sensor together with the walking stick. This device has two main parts, the first part is circuit board, installed at the handle and the other is ultrasonic sensor, installed at the end of the stick. In the circuit, DS PIC 16F628 microcontroller is used and programmed by C Complier program. The program will control ultrasonic sensor to emit ultrasonic wave, the wave will move forward and echo back when it hits objects ahead and then program will compiles and converts the echo frequency to be distance. If the distance is more than 80 centimeters, nothing will happen. If the distance is more than 80 centimeters, program will alert user by sending the sound out through the earphones and the nearer distance between user and object, the more frequently sound will alert. From testing the walking stick, it can really use and is effective as expected but it has problem when it detects metallic object that it will show the wrong sound alert from the program.