1/0 DEVICE
1. Display units

Embedded Systems that require user interactions must have display units, which can be
either Liquid Crystal Display (LCD): The come in various forms. Such as 2-line displays
with eight characters per line, four line display with 12 characters per line. Another kind is
a touch screen like that of automatic teller machine, which is more users friendly. These
can be integrated either the embedded systems with a special software (LCD Driver) for
displaying the data on LCD units

Light Emitting Diodes (LEDs) indicators: Some of embedded systems use LED
indicators to provide status information, such as power on, or whether or not a specific
parameter being measured is within the prescribed limit. They come in different colors

(red, green, yellow) to provide such status information.

2.Keypads

Each embedded systems offer different capabilities for providing user input. Handheld
computers are provided with either full-fledged QWERTY keyboard or a form of
handwriting recognition. Depending on the needs they can vary from few keys to a ful-

fledged keyboard.

Communication Interfaces

Embedded Systems need to interface with the external devices, thus they need
communication interfaces. Most processors provide a serial interface to send and receive
data in serial form. Networked embedded systems are provided with Ethernet interface
Mobile phones and handheld computers are provided with a number of
communication interfaces is such as serial, parallel, infrared, Bluetooth, and

USB(Universal Serial Bus).

+ -FyChallenges In embedded system design process ‏ںےںے‎ ത്തെ
Challenges in embedded system design process