embedded wireless sensors

7/30/2019 embedded wireless sensors

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SEMINAR ON

EMBEDDED WEB

SERVER FOR WIRELESSSENSOR NETWORKS

Presented by

L. Sravan Kumar Reddy

1581210090


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To enhance the communication in an

industrial environment.

To control the industry from a distance.

To reduce the risk of dangerous situations in

an industry.

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Microcontroller units(Atmega 32 and 8)

Xbee modules

Ethernet module

Network Sensors

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Overview of wireless sensor networks

client serverclient server 4


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ServerBlock diagram

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CLIENT- BLOCK DIAGRAM

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Atmega 32

High-performance, Low-power AVR8-bit Microcontroller

32K Bytes of In-System Self-Programmable Flash

-Endurance: 10,000 Write/Erase Cycles

1024 Bytes EEPROM

-Endurance: 100,000 Write/Erase Cycles

2K Byte Internal SRAM

Inbuilt ADC

32 Programmable I/O Lines

Operating Voltages 4.5 - 5.5V

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ETHERNET MODULE

Ethernet controller features

Supports Full and Half-Duplex modes.

Programmable automatic retransmit oncollision.

Programmable padding and CRC generation.

Programmable automatic rejection of

erroneous packets. SPI Interface with speeds up to 10 Mb/s.

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XBEE Module

Key Features

Indoor/Urban: up to 100 m

Outdoor line-of-sight: up to 1 mile (1.6 km)

Transmit Power Output: 100 mW (20 dBm)RF data rate: 250,000 bps

TX Current: 295 mA (@3.3 V)

RX Current: 45 mA (@3.3 V)

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XBEE RF Module Operation

The Xbee OEM RF Modules interface to a host devicethrough a logic-level asynchronous serial port.

Devices that have a UART interface can connect directly to the pins of the RF

module as shown in the figure below.

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LCD INTERFACING

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I2C Protocol

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SPI Protocol

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TCP/IP architectureApplication layer

Provide services that can be used by other applications

Incorporate the functions oftop 3 OSI layers

E.g., HTTP protocol, format in request, dialogue betweenclient and server

http request/response contains format information, sotransformation.

a web page may contain text,graphics,Java applet.Different files, different downloads, the browser keepstracks of downloads.

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TCP/IP architectureTransport layer

Application layer directly run over the transport layer,corresponding to OSI transport layer.

Two kinds of services: TCP & UDP.

TCPTransmission Control Protocol, reliable connect-oriented transfer of a byte stream.

UDPUser Datagram Protocol, best-effort

connectionless transfer of individual messages.

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TCP/IP architectureInternet layer

1. Transfer of information across networks through gateways/routers2. Corresponding to OSI network layer: routing and congestion control

3. Global unique IP address and IP packets

4. Best-effort connectionless IP packet transfer: no setup, routed

independently, robust, out of order, duplicate, or lose of packet

Application

Transport

Internet

Network Interface

Application

Transport

Internet

Network Interface

Internet

Network InterfaceS

Network 1 Network 2

Machine A Machine B

Router/Gateway

IP

packet

Packetof network1

Packet

of network1

IP

packetIP

packet

Packet

of network2

IP

packet

Packet

of network2

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embedded wireless sensors

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