Design, construction and testing of a controller instrument for watering plants

Date

3-1993

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Edvino G. Eusebio

Abstract

n electronic controller instrument for watering plants was designed, constructed, and tested. The circuit design is composed mainly of four modules. The first module consists of the power supply with 12V regulated output. The second module consists of the voltage comparator which serves as the calibrator of the instrument on the moisture level at which to operate. The third module consists of the transistor power amplifier which triggers the electronic switches while the fourth module, consisting of the relay switch and the solenoid valve, composes the electronic switches for the output of the instrument. Two stainless steel electronic probes were used as the moisture sensor. The controller instrument, if it detects soil dryness, turns on the water source and turns off the water source if it detects soil wetness. The instrument is powered by 220 V AC and is packaged in a black hard plastic case for protection from environmental stresses. The results showed that the sensitivity of the instrument occurred at a moisture content of 25.7%, showing a 16.8% error from the calibrated moisture level of 22%. The sensor output voltage and the moisture content of the soil showed a logarithmic relationship with a 94.755% change attributed to each other. The researcher recommends that the controller instrument for watering plants be calibrated on different types of soil, and tested from 0% to 100% moisture content. In addition, this should be applied on other controller devices such as a water level controller.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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