• Title, Summary, Keyword: MCU

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Implementation of Radio Frequency Communication System based Serial UART Communication (직렬 UART 통신 기반 rf 통신 시스템 구현)

  • Jin, Hyun-Soo
    • Journal of Digital Convergence
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    • v.12 no.12
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    • pp.257-264
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    • 2014
  • Through MCU model, Radio Frequency communication is completed using universal asynchronous receiver and transmitter. The communicatin with PC and MCU is completed using RS-232 cable. At first interconnected communication with PC and MCU is necessary for RF communication because tha UART is based technique for RF communication. Program imbeded in microcontroller unit is ran during RF signal is transmitted to other RF module. Data connected with PC and MCU is transmitted between PC and MCU during PC and MCU is connected.

A study of Traction Motor Control Method on Failure of the Main MCU (전기 자동차에서 구동 모터용 인버터의 메인 Micro Controller Unit (MCU) 고장 시 운전 방법에 관한 연구)

  • Lee, Heekwang;Hong, Seungmin;Nam, Kwanghee
    • Proceedings of the KIPE Conference
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    • pp.525-526
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    • 2016
  • 전기자동차 (EV)에서 구동용 모터의 토크 제어를 위한 인버터에는 제어 연산 및 고장 진단 기능을 수행하기 위한 MCU가 있으며, MCU는 상위 제어기 차량 제어 유닛 (VCU)에게 현재 모터 및 인버터의 상태를 주기적으로 전달하고, 현재 차량 주행에 적합한 토크 지령을 받아 토크 제어를 수행하게 된다. 이를 위해 MCU는 전류, 전압 및 위치 센서의 값을 읽어 제어를 수행하게 되며, 제어의 결과 값으로 pulse width modulation (PWM)을 생성하여 이를 통해 모터에 전압을 공급하게 된다. 즉 차량의 구동에 있어 PWM 신호는 가장 중요한 부분이다. 하지만 생산 불량 또는 진동에 의한 납땜 불량 또는 MCU 전원 고장 등으로 MCU에 고장이 발생하게 되면 이상 PWM을 생성하게 되고 정상적인 토크 제어가 불가능해진다. 이때 안전하게 EV를 정지 시키는 알고리즘이 필요하게 되며, 이를 수행 할 supervisor control unit (SCU)가 인버터 컨트롤 보드에 추가되어야 한다. 본 논문에서는 고속으로 주행하던 차량에서 메인 MCU가 고장 날 경우에 안전하게 EV를 정차시키는 방법에 대해 다루었다.

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EXCUTE REAL-TIME PROCESSING IN RTOS ON 8BIT MCU WITH TEMP AND HUMIDITY SENSOR

  • Kim, Ki-Su;Lee, Jong-Chan
    • Journal of the Korea Society of Computer and Information
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    • v.24 no.11
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    • pp.21-27
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    • 2019
  • Recently, embedded systems have been introduced in various fields such as smart factories, industrial drones, and medical robots. Since sensor data collection and IoT functions for machine learning and big data processing are essential in embedded systems, it is essential to port the operating system that is suitable for the function requirements. However, in embedded systems, it is necessary to separate the hard real-time system, which must process within a fixed time according to service characteristics, and the flexible real-time system, which is more flexible in processing time. It is difficult to port the operating system to a low-performance embedded device such as 8BIT MCU to perform simultaneous real-time. When porting a real-time OS (RTOS) to a low-specification MCU and performing a number of tasks, the performance of the real-time and general processing greatly deteriorates, causing a problem of re-designing the hardware and software if a hard real-time system is required for an operating system ported to a low-performance MCU such as an 8BIT MCU. Research on the technology that can process real-time processing system requirements on RTOS (ported in low-performance MCU) is needed.

The Effects of Programming Learning on the Improvement of Problem Solving Ability Using MCU (MCU를 활용한 프로그래밍 학습이 문제해결력 향상에 미치는 효과)

  • Jin, Sung-Su;Park, Phan-Woo
    • Journal of The Korean Association of Information Education
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    • v.14 no.3
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    • pp.319-328
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    • 2010
  • Computer programming education gives students a chance to use computers independently and actively. This plays a very positive role in acquiring higher cognitive skills such as mathematical skills and creative logical thinking. Thus the purpose of this study is to measure the degrees of students' problem-solving abilities using MCU programming kits based on the ICT Education Guide. The experiment confirms that programming classes using MCU kits have a more positive effect on the students problem-solving abilities than do those using the existing computer textbooks. The sub-constituents of problem-solving abilities - problem recognition, information gathering, analysis, diffuse thinking, decision-making, planning, execution, evaluation and feedback - also show significant statistical differences. Therefore, we can conclude that programming classes using MCU kits are very effective in advancing problem-solving abilities.

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The efficient implementation of the multi-channel active noise controller using a low-cost microcontroller unit (저가 microcontoller unit을 이용한 효율적인 다채널 능동 소음 제어기 구현)

  • Chung, Ik Joo
    • The Journal of the Acoustical Society of Korea
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    • v.38 no.1
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    • pp.9-22
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    • 2019
  • In this paper, we propose a method that can be applied to the efficient implementation of multi-channel active noise controller. Since the normalized MFxLMS (Modified Filtered-x Least Mean Square) algorithm for the multi-channel active noise control requires a large amount of computation, the difficulty has lied in implementing the algorithm using a low-cost MCU (Microcontoller Unit). We implement the multi-channel active noise controller efficiently by optimizing the software based on the features of the MCU. By maximizing the usage of single-cycle MAC (Multiply- Accumulate) operations and minimizing move operations of the delay memory, we can achieve more than 3 times the performance in the aspect of computational optimization, and by parellel processing using the auxillary processor included in the MCU, we can also obtain more than 4 times the performance. In addition, the usage of additional parts can be minimized by maximizing the usage of the peripherals embedded in the MCU.

Design of the Embedded EPROM Circuits Aiming at Low Voltage Operation (저 전압동작을 위한 내장형 EPROM회로설계)

  • 최상신;김성식;조경록
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.40 no.6
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    • pp.421-430
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    • 2003
  • In the embedded system, EPROM is difficult to replace a mask ROM for the applications using battery, because the low voltage characteristic of an EPROM is inferior to that of a mask ROM. In this paper, the new circuits such as a word line voltage hoosier scheme and a sense amplifier without reference input for an embedded EPROM in MCU are proposed. The circuits can detect bit line voltage a predetermined level, which is caused by the degradation of the battery. We fabricated a MCU embedded 32Kbytes EPROM. The proposed circuits well operated at 1.5V supply voltage and thus the low voltage performance was improved by about 30%.

An Implementation of Smart Flowerpot made with 3D Printer and NodeMCU (3D 프린터와 NodeMCU를 사용한 스마트 화분의 구현)

  • Na, Chaebin;Choi, YeonWoong;Kim, SeKwang;Seo, JangGui;Hwang, Kitae
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.5
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    • pp.231-237
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    • 2017
  • This paper presents an implementation of a smart flowerpot which can adjust humidity and illumination automatically after monitoring the temperature, humidity, and illumination. We made a container of the flowerpot with a 3D printer and embedded a NodeMCU micro controller in it. We attached a temperature sensor, a humidity sensor, an illumination sensor, and a water pump to the NodeMCU. We developed a control program that adjusts humidity and illumination and ran it on the NodeMCU. Also we developed an Android application and set up an MQTT server. Using the MQTT server, the NodeMCU and the Android application can exchange messages which keep sensor values and commands. Using the Android application. the user can send the proper temperature, humidity, and illumination to the smart flowerpot and monitor the sensor values.

Implementation of Lower-Power HDMI 1.3A CEC using MCU (MCU를 이용한 저전력 HDMI 1.3A CEC 모듈 구현)

  • Jeong, Kwang-Seob;Moon, Ho-Sun;Kim, Yong-Deak
    • Proceedings of the IEEK Conference
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    • pp.735-736
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    • 2008
  • Recently Multi media industry require HDMI-CEC which is the system to integrate various product one action. So you need to implement CEC when you use HDMI1.3a. In this paper, presented how to make CEC protocol in MCU and how to reduce power consumption. This system implement CEC protocol and uart communication as using WELTREND MCU.

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Implementation of a Console Device Driver for MCUs (MCU를 위한 콘솔 장치 구동기 구현)

  • Kim, Kyu-Hyung;Lee, Hyung-Bong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.5-6
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    • 2019
  • 보통 MCU를 기반으로 하는 임베디드 소프트웨어는 펌웨어 형태로 구현되어 콘솔이 없고, UART는 데이터 송신용으로 사용된다. 그러나 MCU 소프트웨어에 콘솔 드라이버를 구현하면 유닉스·리눅스와 같은 대화적 표준 입·출력 개발환경과 타스크 개념을 실현할 수 있다. 이 논문에서는 운영체제 교과에서 익힌 내용을 바탕으로 Atmega2560 MCU에 인터럽트 기반 콘솔 장치 구동기를 구현하고 실험한다.