DESIGN OF POWER SUPPLY, CURRENT SOURCE, USER INTERFACE AND PRODUCT DESIGN ON SYSTEM FOR IDENTIFYING SILENT OBJECTS FOR PERSONS WITH BLINDNESS ON PUBLIC ROADS

• Main Author: Rizki S. Pandia, Rahmadi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43115
• Institution: Institut Teknologi Bandung

Indonesia is the second largest number of blind people in the world. More than one percent or around 3.5 million Indonesians experience blindness with Java as the region with the highest number of blind people. The existence of visual limitations causes blind people to need conventional aids and other people in carrying out activities. The main problem now is that conventional tools have limitations in identifying straightforward objects. The System for Identifying Silent Objects for Persons with Blindness on Public Roads is a system designed to overcome these problems. This system is designed to be able to identify dangerous objects that are in front of users such as trees, poles, trenches and crossings. The system can take pictures and identify them through computational processes. This article discusses some parts of the system. The sections discussed are power supply, current source, user interface, and design. The design of system parts is elaborated based on existing constraints and the part’s dimension. The design of current source is approved by the maximum safe current for human skin which is 5 mA on variations skin resistances from 1 k? to 100 k?. The User Interface should can be used easily using 1 button and 1 switch. The powering system should can power the entire systems at least for 3 hours. The Product Design should can acccommodate all components and does not exceed 25 cm long. The result of designs and implementations are The Current Mirror Wilson is used as current source’s model that can limit the current at 0.3 mA which has 0.009204 mA standard deviation and 0.004602 mA standard eror `on 50 V input Voltage and using 1k? to 10k? resistance. The User Interface has 1 button and 1 switch as inputs also sound, servo and pixel electrotactile as outputs. The Power System uses four 12.24 Wh batteries and has two levels voltage so could empower the system for 6 hours. The Product design can accomodate all components and it is 20.6 cm long.