Abstract
DESIGN, CONSTRUCTION AND PERFORMANCE EVALUATION DETAILS OF A LOW COST CONTACTLESS-DIGITAL TACHOMETER
*Ogunjirin O.A., O.A. Ojo, O.A. Ola and Nwaobilor Promise
ABSTRACT
A Tachometer has been defined as a device used to determine the speed of rotation, typically of a shaft or rotating disc, usually measured in revolutions per minute (RPM). The constructed digital tachometer does this by taking advantage of the properties of the Infrared (IR) sensor to detect the body been measured. It also employs some mathematical computations to convert the IR detections to Revolutions per Minutes (RPM) by extrapolating the data. The entire device was built around the ATmega328-p Arduino Micro-Controller Unit (MCU) which uses the embedded C++ programming language. After Performance testing and evaluation of the device against a commercial tachometer a percentage error of 4.165% was observed, which is well within an acceptable range. The device promises several opportunities especially in automation, instrumentation and control as it can readily be put to use in the performance and evaluation of the agricultural processing machines and tractors alike in the center.
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