International Journal of Engineering, Management & Sciences (IJEMS) ISSN-2348 –3733, Volume-2, Issue-5, May 2015
Wireless Door Locking Shailendra Singh Chauhan, Gaurav Kumar, Sumit Siwach, Vinay Ranjan Jaiswal Abstract— Nowadays everything is moving from manual to automatic so it is necessary to develop door locking device involving some electronic component and mechanical mechanism.The wireless locking system works on single slider crank mechanism and performs the operation locking of door, vaults, etc. This system can be remotely controlled by RF module (Radio Frequency) and DTMF (Dual Tone Multi Frequency). The whole prototype in controlled by ATMEGA-8 microcontroller for controlling the opening or closing of the door. This mechanism (single slider crank mechanism) is highly efficient and economical as it uses only one motor and crank slider mechanism is made up of wood which is not so costly. The main objective of the project is to reduce human effort to remotely control the opening and closing of a simple gate. Index Terms— Four Bar Linkage, Grashof Condition, Motors, Transmitter and Receivers, DTMF Module, AVR Controller Board, L239D motor driving IC..
I. INTRODUCTION As human race is reaching new heights people are evolving too with it in every field from technology to the way of living. Thus, wireless technology is one of most advancing areas in 21st century. As people around the globe are getting caught up in the busy schedule so they want their way of living to reach new heights and experience new inventions and gadgets that could make their live cozy and comfortable. People tends to get annoyed by constant knocking on the door while sleeping especially in hostels, so one of our senior advised us to make some kind of automated mechanism for opening and closing of door. Keeping this thought in mind we put our minds together to bring up a new advancement in the field of wireless technology by bringing up wireless locking system. The whole system consists of first inversion of four bar mechanism that is single slider crank mechanism and some electrical components.IN this project we use RFID technology, radio frequency identification is a fundamental and inexpensive technology that enables wireless data transmission. When we press the button 1 on RFID Module the gate locks itself, while when we press button 2 on the RFID Module the gate unlocks itself and finally when the button 3 is pressed, the operation of the motor controlling the motion of the locking system, stops.
II. MECHANISM The mechanism consist of first inversion of four bar mechanism that is it is a single slider crank mechanism. The slider consists of two rods which performs to and fro motion for locking and unlocking the door. The whole mechanism is powered by a six rpm, six volt DC gear motor and so designed to transform rotational motion of motor into translational motion by means of single slider crank machanism.this mechanism is first inversion of four bar linkage. A. Four Bar Linkage: A four bar link mechanism or linkage is the most fundamental of the plane kinematics linkages. It is a much preferred mechanical device for the mechanization and control of motion due to its simplicity and versatility. Basically it consists of four rigid links which are connected in the form of a quadrilateral by four pin joints. A link that makes complete revolutions is the crank, the link opposite to the fixed link is the coupler and the fourth link a lever or rocker if oscillates or an another crank, if rotate.
Fig 1: Four Bar Linkage B. Planar Four Bar Linkage:Planar four-bar linkages are constructed from four links connected in a loop by four one degree of freedom joints. A joint may be either a revolute that is a hinged joint, denoted by R, or a prismatic, as sliding joint, denoted by P.A link connected to ground by a hinged joint is usually called a crank. A link connected to ground by a prismatic joint is called a slider. Sliders are sometimes considered to be cranks that have a hinged pivot at an extremely long distance away perpendicular to the travel of the slider. The link that connects two cranks is called a floating link or coupler. A coupler that connects a crank and a slider, it is often called a connecting rod. There are three basic types of planar four-bar linkage depending on the use of revolute or prismatic joints: 1. Four revolute joints: The planar quadrilateral linkage is formed by four links and four revolute joints, denoted RRRR. It consists of two cranks connected by a coupler. 2. Three revolute joints and a prismatic joint: The slider-crank linkage is constructed from four links connected by three revolute and one prismatic joint, or RRRP. It can be constructed with crank and a slider connected by the connecting rod. Or it can be constructed as a two cranks with
Manuscript received May 24, 2015. Shailendra Singh Chauhan, Department Of Mechanical Engineering Sikkim Manipal Institute Of Technology, Majhitar, Sikkim, India Gaurav Kumar, Department Of Mechanical Engineering Sikkim Manipal Institute Of Technology, Majhitar, Sikkim, India Sumit Siwach, Department Of Mechanical Engineering Sikkim Manipal Institute Of Technology, Majhitar, Sikkim, India Vinay Ranjan Jaiswal, Department Of Mechanical Engineering Sikkim Manipal Institute Of Technology, Majhitar, Sikkim, India
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