Intelligent walker with obstacle detection technology for visually challenged people

A Review on Sensor Technologies and Control Methods for Mobile Robot with Obstacle Detection System

“…Then the data will be processed by the system for the robotic arm to be stopped if an obstacle of any type is detected near the arm until the obstacle is removed. Both models developed by [7] and [8] have great precision, and the result were promising for how the sensor reacted to the obstacles detected by the array of ultrasonic sensor. Based on the method conducted by [9] used 8 HC-SR04 ultrasonic sensor were used to form an ultrasonic array shown in Figure 5 surrounding the body of the frame.…”

“…According to the study conducted by [7], they utilised 3 units of HC-SR04 ultrasonic sensor to create an array of ultrasonic sensor for object detection and distance measurement on a walking stick for visually impaired people. The setup of the 3 ultrasonic sensors is separated by 90 degrees, which include a front, left, and right-facing ultrasonic sensor shown in figure 2.…”

“…The differences between an ultrasonic sensor and ultrasonic array are the ultrasonic array has a wider coverage to detect the obstacle at the side of the robot depending on how the multiple ultrasonic is being setup. In the study of [7], it used a speech warning message to react to the direction in which the object lies. In the study by [8], also implemented a similar setup on a robotic arm to perform obstacle detection, the ultrasonic sensor is mounted at both side and front of the robot arm gripper to form an array of ultrasonic sensor as shown in Figure 3.…”