Design and fabrication of an aqueous arduino-based low-cost PH meter for a microhydro plant

Date

12-2014

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Electronics Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Roderick L. Catriz

Abstract

The thesis was concerned with the design and fabrication of a low-cost meter. The design was based on five blocks: ISE/sensing block, A/D conversion book, amplification block, calibration blocck, and output block. For the sensing block, a glass electrode was used. For theconversion, amplification, and calibration blocks, a gizDuinomicrocontroller unit (MCU) was used and for the output block, a seven segment display (SSD) and its corresponding decoder IC WAS used. All circuit components were mounted on a single-sided PCB and were enclosed in a plastic casing. Analog-based pH calibration was replaced by push by push buttons.The firmware uploaded in the MCU reads the signal detected by the analog pin then underwent a simulated gain. This amplified signal was then smoothened out and was converted into a pH value using a line equation with the two points at pH 4 and pH 7. The computed output was converted into its binary equivalent.The binary equivalent was outputted into the decoder ICs and into the SSDs. Testing of the lowest-cost pH meter was done on both static and running water environments. The rsults for static yield a difference of at most 0.2 pH units as compared to a commercially available pH meter. For the running water environment, there are no significant differences in readings. if the meter was fabricated with the right materials, the cost of it is decreased to pH 1,164.73 which is cheaper by PHP 835.27 as compared to a commercially available pH meter.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2014 E64 /R44

Document Type

Thesis

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