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MULTILEVEL DESIGN VALIDATION IN A SECURE EMBEDDED SYSTEM FOR 5 INDEPENDENT ZONES

Platform : EMBEDDED

                                                           

MULTILEVEL DESIGN VALIDATION IN A SECURE EMBEDDED SYSTEM FOR 5 INDEPENDENT ZONES

  • Introduction & Comparison

 

The True Computer on a Chip is nothing but a Microcontoller. The Design incorporates all of the features found in a microprocessor CPU: ALU, PC, SP, and registers. It also had added the other features needed to make a complete computer: ROM, RAM, parallel I/O, serial I/O, Counters and a clock circuits.

 

 

v        Microprocessors are intended to be general-purpose digital computers whereas microcontrollers are intended to be special-purpose digital controllers.

 

v        Microprocessor contains a CPU, memory-addressing circuits, and interrupt handling circuits. Microcontrollers have these features as well as timers, parallel and serial I/O, and internal RAM and ROM.

 

v        Microcontoller models vary in data size from 4 to 32 bits. Four-bit units are produced in huge volumes for very simple applications, and 8-bit units are the most versatile. Sixteen – and 32-bit units are used in high-speed control and signal processing applications.

 

v        Many models features programmable pins that allow external memory to be added with the loss of I/O capability.

 

 

 

 

 

 

Project Module

The project modules are divided in two major types are

ü      Hardware Module

ü      Software Module

Hardware Module

The hard ware modules are divided into these categories

  1. a.      LCD interfacing
  2. Keyboard interfacing
  3. Switching circuit interfacing (LDR interfacing)
  4. Designing of the circuits

 

 

  1.  LCD interfacing

In this module we are going to interface the LAMPEX LCD with Microcontoller (89c52).

  1. Key board interfacing

In this module we are going to interface the Keys with Microcontroller either in Matrix method or ordinary method.

  1. Switching interfacing

The electronic relay switch is used to switching the outputs. From one point to another.

These interfacing are with microcontrollers

            Software Modules

1.Gettting knowledge in embedded C

2.Labworks on embedded tools

                        Keil mvision Software

                        Ride Software

3.wrighting the coding

  1.                                                                           i.      Initializing the LCD using embedded C
  2.                                                                         ii.      Key scanning functions using embedded C
  3.                                                                       iii.      Comparison of the two values i.e. original values and the experimental values
  4.                                                                       iv.      Adding the interrupt routines
  5.                                                                         v.      Add relay functions
  6.                                                                       vi.      Wrighting annunciate coding 

 

  1. 4.      Experimentation of each modules

We have to testing the above modules with the breadboard.

 

  1. 5.      Combined circuit diagram

We have to design the combined circuit for our project.

  1. 6.      Testing the combined diagram with breadboard.

We are going to implement the working circuit (combined) in the GPB.

  1. 7.      Designing and development of the Printed Circuit Board

After getting our final Output from the breadboard, we have to design the Printed Circuit Board and implementing the same circuit diagram in the Printed Circuit Board (PCB).

  1. 8.      Testing the Board (PCB)

After implementation of the hardware in the PCB u have to test the PCB.

 

 8- bit Controller

 

Application volumes for the 8-bit microcontrollers may be as high as the 4-bit models, or they may be very low. Application sophistication can also range from simple application control to high-speed machine control and data collection. For these reasons, the microcontroller vendors have established extensive “families “ of similar models. All features a common language, but differ in the amount of internal ROM, RAM, and other cost-sensitive features. Often the memory can be expanded to include off-chip ROM and RAM; in some cases, the microcontroller has no on-board ROM at all, or the ROM is an electrically reprogrammable read only memory (EPROM). 

 

Manufacture     =          Intel 8051

 

Pins/I/O            =          40/32

 

Counter            =          2

 

RAM               =          128bytes

 

ROM               =          4K

Other

 

Features           =          External memory to 128K;Serial Port

 

 

 

 

The 8051 architecture consists of these specific features

 

ü      8-bit CPU with registers A (the accumulator) and B.

 

ü      16-bit Program Counter (PC) and Data Pointer (DPTR).

 

ü      8-bit Program status word (PSW).

 

ü      8-bit Stack Pointer (SP).

 

ü      4 register banks, each containing 8 registers

 

ü      16 bytes, which may be addressed at the bit level

 

ü      80-bytes of general – purpose data memory.

 

ü      32-I/O pins arranged as four 8- bit ports: P0-P3.

 

ü      Two 16 – bit timer/counters: T0 and T1.

 

ü      Full duplex serial data receiver/transmitter: SBUF

 

ü      Control Registers: TCON, TMOD, SCON, PCON, IP and IE.

 

ü      Two External and three internal interrupt sources.

 

ü      Oscillator and clock circuits.

 

 

 

Project description

 

The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and normally closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and Inertia Sensors). When the power is applied, if there's a fault the buzzer will sound and you should switch off again and check for open doors, windows, etc. If everything is in order the buzzer will NOT sound and the exit delay will begin. You have about 30 seconds to leave the building. When you return the buzzer will sound. You then have about 30 seconds to switch off; otherwise the siren will sound. It will go on sounding indefinitely. However, if the building is re-secured the siren will switch off after about 10 minutes and the alarm will reset.

This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC's and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a "system armed" indicator. The schematic is as follows.  Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches). Suitable switches can be bought from alarm shops and concealed in doorframes, or window ledges.

Once set any contact that opens will trigger the alarm, including Zone 1. To prevent triggering the alarm on entry to the building, the concealed re-entry switch must be operated. This will discharge C6 and start the entry timer. The re-entry switch could be a concealed reed switch, located anywhere in a doorframe, but invisible to the eye. The panic switch, when pressed, will trigger the alarm when set.  Relay contacts RLA1 provide the latch, RLA2 operate the siren or buzzer.

 

 

 

 

 

 

 

Block diagram: -

 

 

 
   

 


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