Transcript pcb layout
Submitted to:Prof. Shivendra Singh (Hod EC Dept.) ◉ ◉ Under guidance of Prof. Nidhi Tiwari ◉ ◉ ◉ ◉ ◉ ◉ ◉ ◉ ◉ ◉ ◉ Introduction Theory Steps of making project PCB Layout ETCHING Drilling Component Mounting Soldering Circuit Diagram Working Advantages IVRS is a complete College Automation System which takes in to account the three important dimensions of Educational system namely students, teachers and parents. This system becomes handy in order that the parents get complete information about their wards, in terms of attendance, class tests marks and also the semester examination. The main motto of this system to give the information of student learning in college such as accounts, marks, attendance . Every student is assigned a unique pin number, which is disclosed, only to the parents. The parents can use their mobile or regular telephone and using the pin numbers they can get the complete information about their wards. Interactive voice response or IVR is a technology that allows a computer to detect keypad inputs. Examples of typical IVR applications are: telephone banking, televoting, call center and credit card transactions. It also allows the option of choosing automated services. Information can be fed to the caller allowing choices such as: wait in the queue, choose an automated service, or request a callback. PCB LAYOUT : Lay out of the desired circuit is the most important in any circuit board manufacturing process. The following points are to be observed while performing the layout of the PCB Sufficient space should be maintained between two components. High heat dissipation components like high voltage resistors should be mounted at a sufficient distance from the semiconductors and electrolytic capacitors. Components layout should make proper combination with copper side circuit layout. ETCHING: The removal of excess copper on the copper laminated PCB apart from the printed circuit is known as etching. Generally PCB is placed in F3C13 solution DRILLING: Under this operation drilling should be done as per circuit lay with the suitable drill and high speed machine. Drilling should always be done from copper side to avoid possibility of coming out of copper circuit COMPONENT MOUNTING: All components are mounted at their respective position as per the components layout. Proper precautions should be taken during mounting process SOLDERING TECHNIQUES: A soldered connection ensures metal continuity. The soldering process involves: Melting of the flux which in turn removes the oxide films on the metal to be soldered. Melting the solder which removes the impurities. When the incoming call comes, the first pin of DTMF8870 senses the incoming call and voltage of second pin of 8870 will change from 2.5V to 1V. The comparator senses the change in voltage of second pin and its output goes up. This output is connected to the microcontroller which senses the change and gives an instruction to relay to switch on the telephone hook switch. Simultaneously the microcontroller gives an instruction to the PC to play the welcome message. The caller is asked to press any key and when pressed, this sensed by DTMF 8870 and converted into equivalent binary form. Binary form is sensed by MAX 232 through micro controller and converted into RS232 format which is compatible to PC. As per the key pressed the software decides what action should be taken and the corresponding student details will be delivered. As for example when the incoming calls comes the ring is detected by the hardware circuit and a welcome message “WELCOME TO TECHNOCRATS INSTITUTE OF TECHNOLOGY AND SCIENCE” is played. Then it asks to enter the single digit roll no. and after dialing the roll no. again, a message “PRESS 1 FOR ATTENDANCE DETAILS, PRESS 2 FOR MARKS DETAILS, PRESS 3 FOR ACCOUNTS DETAILS AND PRESS 9 FOR EXIT” is played. As per the key pressed corresponding data is fetched from the database and the message is played. The biggest advantage of IVR for small and large organizations is to save time and money. IVR systems can take care of most of the frequently asked questions that an organization receives. IVR systems have the advantage of making callers and customers feel like they're being attended to. Another advantage is that IVR systems don't sleep. They don't take lunch breaks. They don't go on vacations. Thus information is given at any time. This project is used for the college automation. If database of every student of every college under a university can be provided than it can be used for the whole university automation.