PC-based programmable temperature controller and daylight triggering mechanism

Date

4-1995

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Alexander A. Lim

Abstract

The monitoring and control of temperature and daylight is vital on plants growth. Photosynthesis is dependent on these elements. For micro-environments, humidity and moisture content is controlled by these, which in turn directly contributes to the vantage of plants' growth. In thin film technology, temperature control plays a very important role in producing high-quality thin films and in giving an optimum growth. It also determines the structure of the growing film in vapor deposition. This study uses a type T thermocouple and its transducer is calibrated to 454.54 °C. Optoisolator circuits is use as the actuator for the heater, cooler and daylight switch. These input and output devices are then interface to an IBM PC-XT. Its port is addressable at 300H. The construction is done by: (1) Individual integrated circuits were tested for good condition. (2) The designed circuit is divided into groups and each group is tested in the breadboard. (3) Each group is then connected to one another as designed and is tested again if they are functioning well. The designed circuit was then soldered to a prototyping card. Testing was done by heating and cooling the thermocouple, compiling and running the program developed and turning the actuators on and off. Cubic spline was used to interpolate the set temperature between hour intervals. These values were used to compare with the current read temperature. The data gathered between temperature and the voltage reading of the thermocouple and between temperature and the PC-XT reading were observed, graphed and analyzed. The values obtained are used for determining the needed amplification and for converting the PC-XT reading into temperature, respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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