• Title/Summary/Keyword: FSR sensor

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Design and Implementation of a Readout Circuit for a Tactile Sensor Pad Based on Force Sensing Resistors (FSR로 구성된 촉각 센서 패드용 Readout 회로의 설계 및 구현)

  • Yoon, Seon-ho;Baek, Seung-hee;Kim, Cheong-worl
    • Journal of Sensor Science and Technology
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    • v.26 no.5
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    • pp.331-337
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    • 2017
  • A readout circuit for a tactile sensor pad based on force sensing resistors was proposed, which was composed of an analog signal conditioning circuit and a digital circuit with a microcontroller. The conventional signal conditioning circuit has a dc offset voltage in the output signal, which results from the reference voltage applied to the FSR devices. The offset voltage reduces the dynamic range of the circuit and makes it difficult to operate the circuit under a low voltage power supply. In the proposed signal conditioning circuit, the dc offset voltage was removed completely. The microcontroller with A/D converter and D/A converter was used to enlarge the measurement range of pressure. For this, the microcontroller adjusts the FSR reference voltage according to the resistance magnitude of FSR under pressure. The operation of the proposed readout circuit which was connected to a tactile sensor pad with $5{\times}10$ FSR array was verified experimentally. The experimental results show the proposed readout circuit has the wider measurement range of pressure than the conventional circuit. The proposed circuit is suitable for low voltage and low power applications.

Detection of Implicit Walking Intention for Walking-assistant Robot Based on Analysis of Bio/Kinesthetic Sensor Signals (보행보조로봇을 위한 다중 생체/역학 센서의 신호 분석 및 사용자 의도 감지)

  • Jang, Eun-Hye;Chun, Byung-Tae;Chi, Su-Young;Lee, Jae-Yeon;Cho, Young-Jo
    • The Journal of Korea Robotics Society
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    • v.5 no.4
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    • pp.294-301
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    • 2010
  • In order to produce a convenient robot for the aged and the lower limb disabled, it is needed for the research detecting implicit walking intention and controlling robot by a user's intention. In this study, we developed sensor module system to control the walking- assist robot using FSR sensor and tilt sensor, and analyzed the signals being acquired from two sensors. The sensor module system consisted of the assist device control unit, communication unit by wire/wireless, information collection unit, information operation unit, and information processing PC which handles integrated processing of assist device control. The FSR sensors attached user's the palm and the soles of foot are sensing force/pressure signals from these areas and are used for detecting the walking intention and states. The tilt sensor acquires roll and pitch signal from area of vertebrae lumbales and reflects the pose of the upper limb. We could recognize the more detailed user's walking intention such as 'start walking', 'start of right or left foot forward', and 'stop walking' by the combination of FSR and tilt signals can recognize.

Implementation of Gait Pattern Monitoring System Using FSR(Force Sensitive Resistor) Sensor (압력 센서를 이용한 보행 패턴 모니터링 시스템 구현)

  • Kim, Kiwan
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.2
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    • pp.56-60
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    • 2021
  • Recently, technologies for internet of things have been rapidly advanced with development of network. Also interest in smart healthcare that informs about motion information of users has been growing. In this paper, a system that is monitoring the weight on both feet by using aduino and FSR(Force Sensitive Resistor) Sensor is implemented. A 4-channel sensor driver module was implemented to measure a more accurate weight value. It is monitoring the weight on both feet by the using an application for either your PC or mobile device. Mobile applications can contribute to reducing human damage by sending messages along with location in emergency situations, such as injuries caused by falls during outdoor activities.

A Study on Functional Characteristics of Electrolarynx "Evada" Using Force Sensing Resistor(FSR) Sensor (Force Sensing Resistor(FSR) Sensor를 이용한 전기인공후두 "Evada"의 기능적 특성에 대한 연구)

  • 박용재;최홍식;이주형;이성민;김광문
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.9 no.1
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    • pp.11-16
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    • 1998
  • Background and Objectives : Electrolarynx has been used as one of the methods of rehabilitation for the laryngectomees. Previous electrolarynx could not alter frequency and intensity simultaneously. This institute developed an electrolarynx named "Evada" using FSR(force sensing resistor) sensor, which can control the frequency(and/or intensity) simultaneously. This study was performed for the normal control and laryngectomees with three types of electrolarynx (Evada, Servox-inton, Nu-vois) to reveal functional characteristics of Evada Materials and Methods : five laryngectomees and five normal adults were made to express there sentences(discriptive sentence, "You stay here" ; question sentence, "You stay here?" ; exclamation sentence, "You!! stay here!"), using three types of electrolarynx. Frequency change and intensity change from first and last vowel was calculated in three sentences and analyzed statistically by paired T-test. Results : The frequency change in the question sentence and exclamation sentence was more prominent in Evada than in Servox-inton and Nu-vois. The intensity change in the question sentence and exclamation sentence was also more prominent in Evada than in Servox-inton and Nu-vois. Conclusions : Evada could control frequency and intensity simultaneously and control degree of frequency(and/or intensity) according to the pressing force into the button. Evada could adjust continuously frequency and intensity during conversation. So, Evada is better in producing intonation and contrastive stress than Nu-vois and Servox-inton.

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Implementation of Cushion Type Posture Discrimination System Using FSR Sensor Array (FSR 센서 어레이를 이용한 방석형 자세 판별시스템의 구현)

  • Kim, Mi-Seong;Seo, Ji-Yun;Noh, Yun-Hong;Jeong, Do-Un
    • Journal of the Institute of Convergence Signal Processing
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    • v.20 no.2
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    • pp.99-104
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    • 2019
  • Recently, modern people are increasing the incidence of various musculoskeletal diseases due to wrong posture. Prevention is possible through proper posture habit, but it is not easy to recognize posture by oneself. Various studies have been conducted to monitor persistent posture in daily life, but most studies using constrained measurement methods and high-cost measurement equipment are not suitable for daily life. In this paper, we implemented a posture discrimination system using a FSR sensor array that can induce posture correction spontaneously through sitting posture monitoring in daily life. The implemented system is designed as a cushion type so it is easy to apply to existing chair. In addition, it can identify five most common postures in everyday life, and can monitor real-time through Android-based smart-phone monitoring application. For the performance evaluation of the implemented system, each posture was measured 50 times repeatedly. As a result, 97.6% accuracy was confirmed.

ZMP Control of a Humanoid Robot Using FSR Sensors (FSR센서를 이용한 휴머노이드 로봇의 안정점 제어)

  • Hwang, Byung-Hun;Kong, Jung-Shik;Kim, Jin-Geol;Huh, Uk-Youl
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.505-507
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    • 2004
  • This paper presents a measurement of ZMP using FSR sensors, and then the ZMP control with measured ZMP on single leg. ZMP is mostly used as standard evaluation of stability of a humanoid robot. The ISHURO has 5 sensors which are mounted at each corner and center of a sole. ZMP is computed using a model of a humanoid robot and information from the joint encoders. And we may able to use measurement data from FSR sensors at the robot feet. IP(Integration Proportional) control algorithm is applied to position control of ZMP that is an error of desired ZMP between measured ZMP.

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Simulation of Various Walking Based on FSR Sensor (FSR 센서를 이용한 다양한 보행 구현)

  • Noh, Gyung-Gon;Kim, Jin-Geol
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1793-1794
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    • 2008
  • 본 연구는 다양한 환경에서의 인간형 로봇의 안정적인 보행을 하기위한 FSR (Force Sensing Resistor) 센서 기반의 보행패턴에 관한 전체 시스템의 설계와 이의 모의실험이다. 인간형 로봇의 안정적인 보행을 구현하기 위해서는 보행 패턴의 ZMP(Zero Moment Point) 궤적이 안정 영역 내에 위치하게 하여야 하고, 실제 보행 중에도 외부의 환경적인 요인과 내부의 제어 오차에 따라 보행패턴의 수정과 보완이 요구된다. 이에 FSR 센서를 적용하여 전체 인간형 로봇의 보행 시스템을 설계하고 안정적인 다양한 보행을 구현하기 위한 보행패턴을 제안한다. 이를 모의실험을 통해 평지, 계단, 경사면에 따른 보행 안정성을 검증한다. 차후 이러한 모의실험 결과를 보완하여 FSR 센서를 실제 인간형 로봇에 장착하고 실험하여 안정적인 보행을 구현할 계획이다.

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The Implementation of Walking for a Humanoid Robot by ZMP measurement using Wireless Sensor Network (무선 센서 네트워크를 이용한 ZMP측정에 의한 휴머노이드 로봇의 걸음새 구현)

  • Lee, Bo-Hee;Seo, Kyu-Tae;Hwang, Byung-Hun;Kong, Jung-Shik;Kim, Jin-Geol
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.95-97
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    • 2005
  • This paper deals with the implementation of walking for a humanoid robot by ZMP measurement using wireless sensor network. ZMP is measured by FSR sensors which are mounted at each corner of a sole. The wireless sensor network collects the sensor data according and exchanges robot information between host PC and a robot system. The master controller mounted on robot body receives trajectory data from the host PC via sensor network and drives the joint motor based on trajectory data. The time scheduler of the master controller controls the events at the ratio of 100ms. With this configuration, the walking of the humanoid robot KHR-1 could be realized successfully.

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Development of pressure measuring system for powered-wheelchair (전동휠체어 압력분포 측정시스템 개발)

  • Kil, S.K.;Lee, S.C.;Kim, T.W.;Hwang, J.H.;Hong, E.P.;Han, Y.H.;Lee, J.S.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.7 no.2
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    • pp.109-115
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    • 2013
  • In this paper, we developed pressure mesuring system for powered wheelchair and tried to validate the usefulness of developed system by pressure measuring experiment with 3D motion analysis. This system consist of 64ch seat FSR(Force Sensitive Resistance) sensor unit, 30ch*2 armchair FSR sensor unit, analog and digital hardware board, 2ch rotary encoder unit and realtime signal processing & display S/W. And each data acquired from this system has sampling frequency of 12bit, 10Hz. Pressure measuring experiment for 10 persons who use wheelchair in real life was performed in the 3D vision analysis room. From the experiment, we obtained result that the center line of body inclined to outside direction during powered-wheelchair rotate any direction.

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Development of FSR Sensor Suits Controlling Walking Assist System for Paraplegic Patients (하반신 마비환자의 보행보조시스템 제어를 위한 저항 센서 슈트 개발)

  • Jang, E.H.;Chi, S.Y.;Lee, J.Y.;Cho, Y.J.;Chun, B.T.
    • Journal of Biomedical Engineering Research
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    • v.31 no.4
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    • pp.269-274
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    • 2010
  • The purpose of this study was to develop the FSR sensor suit that controls walking assist device for paraplegic patients. The FSR sensor suit was to detect user's intent and patterns for walking by measuring pressure on the palm and the sole of user's foot. It consisted of four modules: sensing pressure from palm, changing modes and detecting pressure on the palm/at the wrist, sensing pressure from the soles of user's foot, and host module that transmit FSR data obtained from sensing modules to PC. Sensing modules were connected to sensing pads which detect analog signals obtained from the palm or the sole of foot. These collect signals from the target regions, convert analog signals into digital signals, and transmit the final signals to host module via zigbee modules. Finally, host modules transmit the signals to host PC via zigbee modules. The study findings showed that forces measured at the palm when using a stick reflected user's intent to walk and forces at the sole of the user's foot revealed signals detecting walking state.