Browsing by Author "Vasumuthi, D"

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    Multi-Processor Based Intelligent Industrial Monitoring and Control System Based on µCOS-II and Wireless Sensor Networks
    (International Journal of Science and Research (IJSR), 2014-07-01) Zvarevashe, Tinotenda; Vasumuthi, D
    This paper is based on my M Tech project which shares the same title as this paper. It presents a model which illustrates how we can incorporate a Real Time Operating System (RTOS) into an Industrial setup whereby a sensor node resides in the field where processing is carried out and a Master or Control station resides in a control room and the two communicate using a wireless protocol. The RTOS is meant to provide predictability, faster time response and high performance among other wide provisions. The RTOS used to implement this model is µCOS-II (Microcontroller Operating System) from J Labrosse. It is a pre-emptive kernel where the highest priority task in the ready queue is executed first. Thus faster processing of control commands and real time logging of data channeled by sensor node to control station is expected as a result of incorporating the operating system rather than use of a super loop.
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    Polling, Interrupts & µCOS-II: A Comparative Timing Response Simulation Model for Wireless Processor-to-Processor Communication
    (International Journal of Science and Research (IJSR), 2014-07-01) Zwavashe, Tinashe; Vasumuthi, D
    The paper aims to analyze the timing performance characteristics of systems employing polling, interrupts and a Real Time Operating System (RTOS). The RTOS used, specifically, is uCOS-II. The analysis incorporates a model of an Industrial system made up of microcontrollers which communicate using Zigbee protocol and data is send and received over serial ports of the microcontrollers. One microcontroller functions as the sensor node and the other is the master which receives values from sensor node and sends out appropriate control commands in response to received sensor data. The performance of the master node is taken into account since all monitoring and control is being dedicated to this master node. A physical condition of the industrial environment is sent, and in the model we shall send real time temperature values from sensor node to master node such that when set points are exceeded then master controller sends a command to switch ON cooling system to sensor node. The time taken from when sensor node sends an out of range temperature value up to the time it will receive control command from master node is used to determine the time response of the system under the three scenarios of polling, interrupts and an RTOS. Thus the analysis aims to see how polling the serial port, serial interrupts and an RTOS affect the response, predictability and deterministic behavior of the system.