Vol. 99, Issue 12, December 2008, pp.7-17

Design and Development of an Embedded System for Measurement of Temperature and Remote Communication Using Fiber Optic Cable

Raghavendra Rao Kanchi, Sreelekha Kande and Ramanjappa Thogata

Electronics Laboratories, Department of Physics, Sri Krishnadevaraya University,
Anantapur- 515 055, Andhra Pradesh, India

E-mail: drkrr@rediffmail.com

Received: 21 November 2008   /Accepted: 22 December 2008   /Published: 30 December 2008

Abstract: This paper deals with the design of an embedded system for acquiring the temperature, and a fiber optic communication system to link the embedded system with a remotely located IBM compatible PC. The resistive temperature detector (RTD) is used as a temperature sensor, and is interfaced with Atmel’s 89C2051 microcontroller. Temperature values measured in real-time are stored in the on-chip RAM of the microcontroller. These values are processed to a remote PC using fiber optic link. Signal conditioning of the measuring system is accomplished using a constant current source IC REF 200 and an amplifier circuit built in the laboratory using CA 3140. Though the PC does acquire data (data acquisition) and analyze it, the load on PC is very minimal and hence does not get locked up during the acquisition of temperature data in real-time, because it is being taken care by the embedded system. Software is developed in assembly, embedded C and Turbo C. Resonance Integrated Development Environment (RIDE) and Turbo C compilers are used for software development on microcontroller and PC, respectively.

Keywords: Temperature sensor, Fiber optic-link, Microcontroller, Resistive temperature detector (RTD)

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