EMBEDDED SYSTEMAn embedded system consists of hardware and software. When chips are built into systems and software is loaded on that for a particular functionality, it becomes an embedded system.

Embedded systems are the micro-processor/micro-controller based computing/control systems which are designed to perform a specific or a set of tasks.

General purpose systems

• General purpose systems i.e. a single system can perform variety of operations.

• System designer decides the features and their strength.

•Bulky and costly.

Embedded systems

• Designed to perform a specific task. i.e. a limited operations.

• Features of the system are constrained.

• Comparatively optimized.

e.g. Personal computers, Laptops etc.

e.g. Calculators, Robots, Automation control etc.

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Microprocessor Based System

• Minimization Of Circuit.• Reliable• Power Efficient• Production when done even on Medium-

scale is cost effective

ROBOTICS AUTOMATIC DOORS

LED DISPLAY PANEL

AUTOMOTIVE ELECTRONICS

ARTIFICIAL SATTELITE

HEART PULSE RATE METER

i-PODS Smart phones

Washing Machine

Camcorders

MICROCONTROLLER

OUTPUT

INPUT

Subsystems of Embedded System

Three main subsystems– Microcontroller– Memory• To store program• To store data– Input & Output• Interconnectingelements

Device name ROM RAMAT89C1051 1K 64 bytesAT89C2051 2K 128 bytesAT89C4051 4K 128 bytesAT89C51 4K 128 bytesAT89C52 8K 256 bytesAT89C55 20K 256 bytesAT89S51 4 K 128 bytesAT89S52 8 K 256 bytesAT89S53 12K 256 bytes

AT89 Series Microcontrollers

OTHER HARDWARE Power Source

LED

Seven Segment Display

LCD

Keypad/Keyboard

Motors• DC motor• Stepper Motor

Interrupt

Digital to Analog convertor

Analog to Digital convertor

OTHER HARDWARE RF Radio Frequency

DTMF Dual Tone Multi Frequency

IR Infrared

Temperature Sensor

PIR sensor (Motion Sensor)

RFID (card / tag) Reader

Companies

• SAMSUNG• ST ELECTRONICS• NOKIA• APPLE• MOTOROLA• DRDO• AND MANY MORE……………..