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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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（完整内容请下载后查看）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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