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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