10/04/2023Roshan Mani 1

A PRESENTATION

ONEMBEDDED SYSTEM

PRESENTED TO: PRESENTED BY:Mr. MAHESH KUMAR MEHRA ROSHAN MANI (Assistant Professor) (11ECTEC047)

DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERINGGOVT. COLLEGE OF ENGINEERING & TECHNOLOGY, BIKANER

10/04/2023Roshan Mani 2

What Are Embedded Systems?

“Special purpose system which are either used as standalone or part of a big system” 

An Embedded System is one that has computer hardware with software embedded in it as one of its important components.

An embedded product uses a microprocessor (or microcontroller) to do one task only.

Embedded basically reflects the facts that they are an integral part of the system.

An embedded system is designed to run on its own without human intervention, and may be required to respond to events in real time.

10/04/2023Roshan Mani 3

Household appliances

Integrated systems in aircrafts and missiles

Cellular telephones

Electric and Electronic Motor controllers

Engine controllers in automobiles

Calculators

Medical Equipments

Videogames

Digital musical instruments

WHERE ARE THEY PRESENT ?

10/04/2023Roshan Mani 4

THE NECESSARY TOOLS FOR A MICROPROCESSOR/MICROCONTROLLER

CPU: Central Processing Unit

I/O: Input /Output

Bus: Address bus & Data bus

Memory: RAM & ROM

Timer

Interrupt

10/04/2023Roshan Mani 5

MICROPROCESSOR SYSTEM CONTRASTED WITH MICROCONTROLLER SYSTEM

10/04/2023Roshan Mani 6

MICROPROCESSOR VS. MICROCONTROLLER

Microcontroller

CPU, RAM, ROM, I/O and timer are all on a single chip

Fix amount of on-chip ROM, RAM, I/O ports

For applications in which cost, power and space are critical

Not Expensive

Single-purpose

Microprocessor CPU is stand-alone, RAM,

ROM, I/O, timer are separate

Designer can decide the amount of ROM, RAM and I/O ports

Expensive

Versatility

General-purpose

10/04/2023Roshan Mani 7

MICROCONTROLLER ARCHITECTURE

10/04/2023Roshan Mani 8

MEMORY ADDRESSING & TYPES RAM ROM PROM EPROM EEPROM FLASH MEMORY

10/04/2023Roshan Mani 9

8051 PIN descriptionP1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

RST

(RXD) P3.0

(TXD) P3.1

(INT0) P3.2(INT1) P3.3

(T0) P3.4

(T1) P3.5

(WR) P3.6

(RD) P3.7

XTAL2

XTAL1

GND

P2.7 (A15)

P2.6 (A14)

P2.5 (A13)

P2.4 (A12)

P2.3 (A11)

P2.2 (A10)

P2.1 (A9)

P2.0 (A8)

PSEN

ALE/PROG

EA/VPP

P0.7 (AD7)

P0.6 (AD6)

P0.5 (AD5)

P0.4 (AD4)

P0.3 (AD3)

P0.2 (AD2)

P0.1 (AD1)

P0.0 (AD0)

Vcc

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

23

22

21

24

25

2627

28

29

30

31

32

33

34

35

36

37

38

39

40

8051

10/04/2023Roshan Mani 10

LIGHT EMITTING DIODE

11

SEVEN SEGMENT DISPLAY The seven elements of the display can

be lit in different combinations to represent the Arabic numerals.

In a simple LED package, typically all of the cathodes (negative terminals) or all of the anodes (positive terminals) of the segment LEDs are connected and brought out to a common pin; this is referred to as a "common cathode" or "common anode" device.

10/04/2023Roshan Mani

10/04/2023Roshan Mani 12

SEGMENT IDENTIFICATION A Seven-Segment Display (SSD) is simply a figure

eight grouping of LEDs { include a decimal point (DP)}. Each Segment is labeled (a) to (g). SSDs are available in two configurations

Common Cathode (all LED cathodes are connected) Common Anode (all LED anodes are connected)

a

b

c

d

e

g

dp

f

13

INTERFACING OF SEVEN SEGMENT DISPLAY

10/04/2023Roshan Mani

14

LIQUID CRYSTAL DISPLAY A liquid crystal display (LCD) is a flat panel

display, electronic visual display, or video display that uses the light modulating properties of liquid crystals. Liquid crystals do not emit light directly.

Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, and two polarizing filters, the axes of transmission of which are (in most of the cases) perpendicular to each other.

10/04/2023Roshan Mani

10/04/2023Roshan Mani 15

INTERFACING OF LCD WITH 8051

10/04/2023Roshan Mani 16

APPLICATIONS IN INDUSTRY

Telecom Automotive applications Domestic applications Robotics Aerospace applications Medical equipment Defense systems

10/04/2023Roshan Mani 17

PROJECT OVERVIEWBI-DIRECTIONAL VISITOR COUNTER & HOME AUTOMATION

The objective of this project is to make a Microcontroller based model to count number of persons visiting particular room and accordingly light up the room.

10/04/2023Roshan Mani 18

TRANSMITTER & RECEIVER CIRCUIT

10/04/2023Roshan Mani 19

BDVC MAIN PART

10/04/2023Roshan Mani 20

WORKING PICTURE

10/04/2023Roshan Mani 21

APPLICATIONS:

1. This circuit can be used domestically to get an indication of number of persons entering a party.

2. It can be used at official meetings.

3. It can be used at homes and other places to keep a check on the number of persons entering a secured

place.

4. It can also be used as home automation system to ensure energy saving by switching on the loads and fans only when needed.

22

THANK YOU

10/04/2023Roshan Mani