- Asrizal
Department of Physics, Universitas Negeri Padang, West Sumatera, Indonesia

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Pengembangan sistem pengontrolan konduktivitas listrik larutan berbasis internet of things untuk tanaman hidroponik (Development of the electrical conductivity control system in the solution based on the internet of things for hydroponic plants) Weli Erlina; - Asrizal
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (234.735 KB) | DOI: 10.24036/7627171074

Abstract

Hydroponics has become an alternative for people who want to garden, but they didn’t have enough space to grow crops. The most important problem that must be considered in hydroponic cultivation is the provision of adequate nutrition for plants. Inappropriate electrical conductivity values will result in undesirable things. Controlling conductivity in plants hydroponically is required so that the plants get the value of conductivity that accordingly. The purpose of the research is to determine the performance spesifications of the electrical conductivity control system, determine the effect of adding AB Mix solution to the conductivity and output voltage values, determine the accuracy and precision of the electrical conductivity control system on laboratory scale tests, and determine the results field scale test on the conductivity control system. This research is classified as research and development which is a research method used to develop products. Based on the results of data analysis, it can be concluded that there are four research data results. First, performance specifications which consist of sensors to measure electrical conductivity values, a circuit box containing a Node Mcu and a relay to drive the solenoid valve in the event of control. Second, the effect of adding AB Mix is directly proportional to the value of the conductivity. This means that the more the addition of solution AB Mix then the greater value output voltage. Meanwhile, the determine of the output voltage value the greater with the addition of solution AB Mix. Third, the results of the accuracy and presicion of the electrical conductivity control system of 98.98% and 97.40%. That is, the measurement and control data can be used because it is close to 100%. Third, the results of field scale tests that have been carried out for 3 days get varied data. Electrical conductivity values obtained during the field scale tests from 690 ppm up to 945 ppm.
Experiment modeling tool development wheels related to the control advance for video tracker analysis - Harviyani; - Asrizal
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.971 KB) | DOI: 10.24036/10324171074

Abstract

The concepts explained by Physics can be the basis for the development of new disciplines. Theory explains the results of experiments carried out and subsequent experiments.Observations prove that experiments using manual tools still have many shortcomings . Physics parameters that can be displayed are still a bit of a weakness.This problem can be overcome by modeling tools that analyzed the video using a tracker.This study aims to determine the accuracy, accuracy, and resolution of controlling the speed of a DC motor, determine the performance specifications of the related wheel experimental model modelingtool, determine the accuracy and accuracy of the related wheel circular motion modeling tool, determine the physical magnitude and influence of each of the wheel relations of the modeling tool. This research is classified into laboratory experiment research method. Laboratory experiments are researches that apply science into a design to get performance as expected. Direct measurement is done by varying the speed and type of wheel connection. Indirect measurements are carried out analysis using a tracker software with the resulting data is linear velocity and angular velocity. Data analysis carried out revealed four research results. The performance specifications which consist of a circular motion modeling tool related to the length of 35 cm, width 5 cm and height 20 cm by controlling, average value of accuracy and accuracy of DC motor rate control are 99.06% and 99.55%, respectively. Accuracy value for linear velocity is 99.35%, accuracy at angular velocity is 99.63%, and the accuracy value of each relationship is> 95%. Tangent wheel has the same linear velocity value, different angular velocity , and opposite wheel rotation direction . Centralized wheels have different linear speeds, angular speed and direction of wheel rotation are the same. The wheels connected by ropes have the same linear velocity and direction of rotation of the wheels, different angular velocity values.