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Vol. 87, Issue 1, January 2008, pp.46-51




An Embedded Based Digital Controller for Thermal Process


1A. Lakshmi Sangeetha and 2A. Balaji Ganesh

1Department of Computer Science, Dhanalakshmi Srinivasan College of Engineering, Perambalur

2Embedded and Applied Computing Laboratory, TIFAC-CORE,

Velammal Engineering College, Chennai, India

Tel.: +91 44 25025325

E-mail: lakshmi.vijay2005@gmail.com, abganesh_nitt@yahoo.com



Received: 5 November 2007   /Accepted: 21 January 2008   /Published: 28 January 2008


Abstract: This paper describes a low cost virtual instrumentation (VI) system to monitor and control the electrically heated water bath temperature. The PIC16F877 based digital microcontroller is used as thermostat which controls and monitors the temperature. The digital controller also allows the user to modify the sensor (PT100) calibration data values if necessary. The developed programmable on/off control function provides on-line display of measuring temperature, set point as well as the control function output plots through the parallel port. This bus interaction is realized in Visual Basic/Assembly Language and uses a 16 bit, 10 ms sampling analog-to-digital converter (ADS 7805) for monitoring and controlling the parameters of the temperature local digital controller.


Keywords: Embedded based digital controller, PIC16F877, Virtual instrumentation, Temperature


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