LM317T Voltage Regulator with Pass Transistor

Micro-controller interfacing circuit contains power supply, 16F877A PIC, voltage regulator 7805, 10KΩ resistors for the input ports, 330Ω resistors for the output ports. Two transistors C5476 BJT NPN type were added -as a switch- to the drive circuit for the two drive systems to let the PIC activate the relay coil. PIC used for main drive system to control direction and position of the car automaticaly. For main drive system, PIC was programmed to have seven input ports and two out ports. The seven input ports were connected to four magnetic switches and three pushbuttons. The two output ports connected to the Bases of two BJTs in the drive circuit, one to move the car upward and the other to move the car downward. Before connecting the interfacing circuit to the input switches and the main motor, it had been tested on a laboratory breadboard and connected to a DC Wiper motor. The input switches were seven normally open switches connected on the breadboard. Hashemite Uni. - Mechatronics Dept. - Panorama Electrical Elevator Graduation Project 2008/2009. Done by: Ashraf Samir Al-Bitar: aushrufcouzin@hotmail.com Ahmad Sufain Abu-Asfar: ahmadaboasfar@yahoo.com Hazem Jamil Al-Hawajreh: hazemja@hotmail.com Supervised by Dr. Asma Al-Tamimi



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