Semih Özden

A prototype of PC based remote control of irrigation

In recent years, more efficient and positive use of current water resources together with global warming becomes important. New technologies and ideas have been developed for many years to optimal use of water resources especially in agricultural field. Growers irrigate their own areas uniformly. However demand of water, fertilizer and agricultural chemicals are different for each trees or crops depending on plant ages and chemical content of soil. Determination of water demand for crops and trees is important to protect fresh water resources. In this study, a prototype of solar powered, low cost, remote controlled real time monitoring irrigation system was designed to control drip irrigation. Software (ValCon, developed by authors with C# language in Visual Studio.Net 2008 editor) was developed to control irrigation valve and monitor water content of soil. Control method of irrigation (automatic or manual) can be selected by users. Only water content of soil was monitored. Nevertheless by using sensors which measure other features of water or air, it is also possible to extend the designed system. Remote controlled site-specific irrigation scheme prevents moisture stress of trees and salification besides providing the efficient use of fresh water resources. Also, this irrigation method removes labour that is needed for flooding irrigation

Design of Linear Switched Reluctance Motor Driver for Automatic Door Application

—In this study, a buck converter and a driver has been designed for Linear Switched Reluctance Motor (LSRM) with 6/4 poles, 3 phases, 250W. LSRM controlled by PIC 18F452 microcontroller was used to drive automatic door. Motor was controlled more accurate with linear incremental encoder by sensing acceleration and movement direction of door.

Occupational exposure to magnetic fields from transformer stations and electric enclosures in Turkey

We aimed to provide a systematic evaluation of magnetic field (MF) exposure of staff working in the offices located above or close to transformer stations (TS) and electric enclosures (EE). Occupational short-term “spot” measurements with Narda EFA-300 and isotropic magnetic field probe were carried out in two National Banks and one Industrial Company having more than 500 employees. Extremely low-frequency (ELF) MFs up to several tens of μT were measured in the mentioned working environments. 25% of the measured MFs were found less than 0.3 μT, the background exposure level that staff receive at home, 75% were above 0.3 μT with the highest value of 6.8 μT. The mean and median personal exposures were calculated to be 1.19 μT and 0.56 μT, respectively. Most of the staff (83%) is under risk based on epidemiological studies that reported a statistically significant association between risk of leukemia and averaged magnetic fields of 0.2 μT or over. Results showed that risk evaluation should be considered to minimize the possibility of the workers being harmed due to exposure to work-related electromagnetic sources.

Design and Implementation of a Solar Controller and PC Data Acquisition System for PV Energy Applications

In this study, a mainboard was designed for solar energy control with PC data acquisition system. The released system included forty-eight pieces of PV panels, 1.92 kW BLDC and eight pieces of 65 Ah batteries. The buck type DC-DC converter was controlled to charge battery depending on its voltage and current scheme. The BLDC motor was coupled to a pump and a MOSFET was used as motor run/stop switch for automatic working. This system was applied to irrigation in Turkey that it is consist of 1000 pieces of dwarf cherry tree. The controller had communication with PC and DAQ card. All analog values of system (currents, voltages, temperatures, etc.) send to PC with RS-232 and DAQ with reading analog values.

GA based adaptive velocity control of linear switched reluctance motor under different load and velocity profiles for industrial application

In this study, Genetic Algorithm (GA) was used for determining best PID parameter for speed and position controller of linear switched reluctance motor (LSRM) under different load and distance profiles. On the linear movement, the control parameters for precision control are needed to update, depending on distance and load. The LSRM has nonlinear model that it is hard to define PID parameter with calculation. GA is best way to find PID parameter to control velocity. The GUI was developed and applied the LSRMs parameters are changeable.