Switch in Car 0 Switch in Car 1 Encoder Binary encoded data over bus Decoder Activities to do- 1. Identify the following design parameters - 7 segment LED display at driver's dash board Switch in Car 6 Fig. 1: The functional block level diagram of the proposed digital system a. Number of switches that will be required. b. Number of the bits/wires required in the data bus. c. Size of the encoder and decoder. m D 2. Read one of the 7 segment LED display data sheet, try to understand how to use it. 3. Design the encoder and decoder blocks with basic logic gates then incorporate the same into a complete digital system on Logisim. 4. Submit your design with a brief text explanation/description on how it will actually work. You must explain the working of your system to get full credit.

New York's Metropolitan Transport Authority (MTA) operates the subway transport facility in New York. Each subway train consists of 6 subway cars all chained together and pulled by a motored subway car at the front end. (6 + 1 motor car in total) To improve the security of passengers, MTA decided to install a switch inside every subway car. A passenger can press this emergency switch which is there in his/her car to signal the driver that an emergency situation has happened in his/her car. In response the driver will then dispatch security personnel to that particular car, when the car stops at the next station. You are recruited by MTA to develop a digital system to achieve this. MTA's chief wants that when the emergency button is pressed in a particular car, that car's number should be displayed in the driver's dash board. If no button is pressed, the display remains off. You decided to use a 7 segment LED display, an encoder and a decoder built by TTL chips, to design and implement this system. The functional diagram of the system is given below.