Microcontroller-based irrigation controller

Date

10-2005

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

A microcontroller-based irrigation controller system was designed, constructed and tested. The system used gypsum block as sensor. The change in resistance of the gypsum block as a function of its moisture content was as the basis for measuring the moisture content of the soil. The sensor was calibrated using clay loam soil from wilting point to saturation point. Irrigation schedule was controlled in two ways: by measuring the change in moisture content of the soil and by utilizing a timer to control the time of irrigation. The testing of the instrument was also divided into two parts. The first was conducted by setting different start times, durations and time intervals of ON and OFF-time of the system. The second testing was done by simulating the voltage input to ADC using a variable potential divider. The results showed that the system turned the valve on at the time set by the user or at moisture content of 22% or lower. It turned the valve off after the duration set by the user was attained.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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