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超声波传感器为视障人士提供帮助 An Electronic Aid for a Visually Impaired Person

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使用超声波传感器为视障人士提供电子帮助 。文档为An-Electronic-Aid-for-a-Visually-Impaired-Person-Using-an-Ultrasonic-Sensor总结文档，是一份不错的参考资料，感兴趣的可以下载看看，，，，，，，，，，，，，

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1.1-2  
An Electronic Aid for a Visually Impaired Person Using an  
Ultrasonic Sensor  
Sehyung Park1, Laehyun Kim1, Sungdo Ha1, Hyunchul Cho1 and Soo Yong Lee2  
1Korea Institute of Science and Technology, 2Hongik University, Korea  
Abstract--This paper presents an electronic device, called  
SmartWand, which can help a visually impaired person walk  
around more safely. Attached to a conventional white cane, the  
SmartWand detects obstacles that cannot be detected by a  
traditional cane and gives warnings in the forms of vibration or  
sound. In addition to obstacle detection, it also provides functions  
to detect colors of objects and the brightness of surroundings.  
II. SYSTEM CONFIGURATION  
The SmartWand consists of an ultrasonic sensor to detect  
obstacles; a color sensor to detect the colors of objects; a  
brightness sensor to detect the brightness of surroundings; a  
micro-processor and electric circuits to process sensing data; a  
vibrator to warn of the existence of an obstacle; memory to  
store the voice warning data; a speaker; and, a power supply  
(Fig. 2). The specifications of each component are shown in  
Table. I.  
I. INTRODUCTION  
We are introducing an electronic device, called SmartWand,  
which detects obstacles using an ultrasonic sensor. In addition  
to obstacle detection, the SmartWand also provides functions  
to detect the colors of objects and the brightness of  
surroundings. Attached to a conventional white cane (Fig. 1),  
it detects the obstacles in front of an upper body, which cannot  
be detected by a traditional cane. The SmartWand introduced  
in this paper is the second version of a prototype which has  
been improved based on a user study. It has been improved in  
terms of functionality as well as appearance. The new  
functions added include the elimination of impact errors,  
caused by tapping the ground, and the restriction of obstacles  
detected only in the forward moving direction. To  
commercialize the device, the study to improve reliability and  
comfort will continue.  
Motion sensor  
Ultrasonic receiver  
Ultrasonic  
Mode switch  
transmitter  
Speaker  
On/off switch  
Charging terminal  
Board and color sensor  
Cover  
Battery  
The previous development of devices for the visually  
impaired includes the Ultracane[1,7], which uses an ultrasonic  
sensor; the Laser Cane[4] and the Teletact[5,6], which use  
laser sensors; and, a wearable device called Openeyes[8].  
These devices require the learning of new walking and caning  
patterns or have problems of high-error rates, etc.  
Fig. 2. Structure of the SmartWand  
TABLE I.  
SMARTWAND SPECIFICATIONS  
Component  
Specifications  
External  
appearance  
Size: 70 x 42 x 62 mm  
Weight: 140g  
HG-L40TS, HG-L40RS  
Effective distance: 10-300cm  
Effective angle: 60o  
Ultrasonic  
sensor  
TCS230  
Color sensor  
Right intensity to frequency converter (R, G,  
B, Clear)  
Brightness  
sensor  
CdS Sensor(A90.12)  
Circular thin vibration motor  
Diameter: 10mm  
Power source: 3.0V, 40mA  
Speed of revolution: 10000-15000RPM  
Fig. 1. SmartWand: general appearance and shape after attached to a cane  
Vibrator  
This work was supported by the IT R&D program of  
MKE/IITA (2008-F-045-01, Development of Digital Guardian  
technology for the disabled and the aged person)  
Lithium Polymer Battery  
3.7V, 520mAh  
Power supply  
978-1-4244-2559-4/09/$25.00 ©2009 IEEE  

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