ไอโซนาร์ 2: เครื่องบอกเตือนสิ่งกีดขวางสำหรับผู้บกพร่องทางการเห็น

iSonar-2 is obstacle warning device which allow the blind and visually impaired avoid dangerous objects from user’s head to lower body. This research proposes a prototype of iSonar-2; a low-cost directional obstacle warning device using multiple ultrasonic transducers with a miniaturized, high performance. To avoid collision, three ultrasonic transducers with 40 kHz are used to detect obstacles within the range of the user’s head and the ground, including stairs. iSonar-2 provides directional tactile feedback with 3 DC motors that vibrate in different positions and frequencies, depending on the details of the obstacle’s whereabouts and characteristics. The coverage area is 130 cm forward and 100 cm from each side which makes iSonar-2 more practicable and provides accurate awareness for users in tough and pleased in appearance.