how would I use multisim to build the security monitoring sy

how would I use multisim to build the security monitoring system from the digital Systems principles and applications eighth edition figure 9-31

Solution

Multisim:-Currently, embedded microprocessor and Programmable Logic Devices (PLD) such as FPGA, CPLD are the primary components in modern digital systems. The use of PLDs allow the user to download the design and replaces the former part of interconnected fixed-function MSI TTL or CMOS chips. However, the functions and applications of the traditional 74 series TTL are explained in most current available textbooks and the 74-series TTL chips find the major market in the university labs. In the lab sessions with breadboards, students also need to get the pinout diagram in order to wire them. It will take the student significant time (nearly 2 hours) to wire the breadboard which leaves them little time to learn about how the circuit works. Multisim is a complete system design tool that offers a very large component database, schematic entry, full analog/digital SPICE simulation, VHDL/Verilog HDL design entry and simulation, FPGA/CPLD synthesis, RF capabilities, post-processing features and seamless transfer to PCB layout packages such as Ultiboard. It offers the full capability of capture, simulation and analysis of the electronic schematic circuits. After the schematic design is captured, Multisim provides you with an interactive oscilloscope, bode plotter, logic analyzer, power supply, multimeter, function generator, etc to simulate and analyze the design. With Multisim, the student’s opportunities are expanded to allow them to try new situations and analyze the results that they have learned to foresee through the theories and principles. The adoption of Multisim in the teaching of digital systems design course at IPFW (Indiana-Purdue University Fort Wayne), it never intends to substitute for the hands-on experimentation on the breadboards, on the other hand, it allows the students to get the pre-knowledge of the oncoming lab sessions. Besides, many students discovered that the IC libraries in MultiSim provide pinout diagrams, and they call these up to help them wire the corresponding hardware ICs.

Design of An Office Alarm System:This office alarm system requires a logic circuit that will trigger a camera to take a picture when any of the following conditions are met:

1. The office door is opened outside normal office hours

2. One of the desks is opened while the desk alarm is armed

Four sensor devices provide the following input signals:

DOOR Low output (0V) from this sensor if the office door is open

ARMED High output (5V) from this sensor if the desk alarm is armed

TIMER High output (5V) from this sensor during normal office hours

DESK Low output (0V) from this sensor if all desks are closed.

One output signal controls the camera:

CAMERA The camera takes a picture when CAMERA is low voltage (0V).

Before the lab session on the breadboards, students also need to design and simulate using Multisim. The captured schematic in Multisim can be used as blueprint in the oncoming lab session.students will learn what causes timing hazards in the combinational logic circuits, how hazards due to single input changes can be eliminated, and what happens if more than one input is allowed to change simultaneously. There are three parts in this lab and Multisim can be used for each part in the pre-lab preparations.