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Weather refers to the conditions of theatmosphere at a certain place and time.

Weather differs from Climate, whichdeals with long-term conditions in the

atmospherepatterns, averages, andextremes (most/maximum and least/minimum).

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Temperature

Light Sensor

MoistureHumidity

Whether sensors

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The LM35 series are precision integrated-

circuit temperature sensors, whose outputvoltage is linearly proportional to theCelsius (Centigrade) temperature

Specifications: Calibrated directly in Celsius

(Centigrade)

Linear + 10.0 mV/C scale factor 0.5C accuracy guaranteeable (at

+25C)

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Rated for full -55 to +150C range

Suitable for remote applications

Low cost due to wafer-level trimming

Operates from 4 to 30 volts

Less than 60 A current drain

Low self-heating, 0.08C in still air

Nonlinearity only C typical

Low impedance output, 0.1 Ohm for 1mA load

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An LDR (Light dependent resistor),as its name suggests, offersresistance in response to the

ambient light. The resistance decreases as the

intensity of incident light

increases, and vice versa.

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In the absence of light, LDR exhibits aresistance of the order of mega-ohmswhich decreases to few hundred ohms in

the presence of light. It can act as a sensor, since a varying

voltage drop can be obtained in

accordance with the varying light. It is made up of cadmium sulphide

(CdS).

An LDR has a zigzag cadmium sulphidetrack.

It is a bilateral device, i.e., conducts inboth directions in same fashion.

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Based on a unique capacitivecell, these relative humiditysensors are designed for highvolume, cost sensitive

applications such as officeautomation, automotive cabinair control, home appliances,and industrial process controlsystems. They are also useful in allapplications where humiditycompensation is needed.

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Features:

Instantaneous desaturation after longperiods in saturation phase

High reliability and long term stability

Suitable for linear voltage or frequencyoutput circuitry

Fast response time

Key Specifications:

Power requirements: 5 to 10 VDC

Communication: Capacative Component

Dimensions: 0.25 x 0.40 in Diameter (6.2 x10.2 mm Diameter)

Operating temp range: -40 to 212 F (-40 to100 C)

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Technological Standard Created for

Control and Sensor Networks

Based on the IEEE 802.15.4 Standard Created by the ZigBee Alliance

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Silicon

PHY Layer

MAC LayerMAC Layer

Data Link Layer

Network Layer

ZigBee

StackApplication

Application Interface

Application

ZigBeeAlliance

IEEE

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0dBm 10dBm 20dBm

250kbps 10 20 40

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Virtual links

Network coordinator

Network node

Communications flow

IEEE node

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the software

Network, Security &

Application layers

Brand management

IEEE 802.15.4

the hardware

Physical & Media Access

Control layers

PHY868MHz / 915MHz / 2.4GHz

MAC

NetworkStar / Mesh / Cluster-Tree

Security32- / 64- / 128-bit encryption

Application

API

ZigBeeAlliance

IEEE802.15.4

Customer

Silicon Stack App

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Source: http://www.zigbee.org/en/resources/

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Source: http://www.zigbee.org/en/about/faq.asp

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Low data rate

Low power consumption

Small packet devices

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Operates in Unlicensed Bands

ISM 2.4 GHz Global Band at 250kbps

868 MHz European Band at 20kbps 915 MHz North American Band at 40kbps

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Designed for wireless controls andsensors

Operates in Personal Area Networks(PANs) and device-to-device networks

Connectivity between small packetdevices

Control of lights, switches, thermostats,appliances, etc.

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Topology

Star

Cluster Tree Mesh

Network coordinator, routers, enddevices

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States of operation Active

Sleep

Devices Full Function Devices (FFDs)

Reduced Function Devices (RFDs)

Modes of operation Beacon

Non-beacon

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In an industry during certain hazards is

will be very difficult to monitor theparameter through wires and analogdevices such as transducers.

To overcome this problem we usewireless device to monitor theparameters so that we can take certainsteps even in worst case.

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The fundamental aim of this project is todevelop an embedded system to design a

wireless weather monitoring system whichenables to monitor the weather parameterin an industry or anywhere by using Zigbeetechnology and display the parameter on

the PCsscreen.

The system contains two parts. One is

transmitter node and another one isreceiver part and both can be anynumber.

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The transmitter part consists of whethersensors, microcontroller and ZigBee and thereceiver part consist of a PC interfacedwith Zigbee through PC serial port.

In this project we deal with monitoring theweather related parameters throughwireless Zigbee modules.

Here we monitor temperature, LDR andhumidity with the help of respectivesensors.

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The data from the sensors are collectedby the micro controller and transmitted

to the receiver section through wirelessmedium.

All the parameters are viewed by the pc

using program in the receiver side.

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The LPC2141/2/4/6/8 microcontrollers are basedon a 32/16 bit ARM7TDMI-S CPU with real-timeemulation and embedded trace support, thatcombines the microcontroller with embeddedhigh speed flash memory ranging from 32 kB to512 kB.

A 128-bit wide memory interface and a uniqueaccelerator architecture enable 32-bit codeexecution at the maximum clock rate.

For critical code size applications, thealternative 16-bit Thumb mode reduces code bymore than 30 % with minimal performancepenalty.

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This High Speed CC2500 Based Wirelessmodule is a plug and play replacementfor the wired Serial Port (UART) supporting

baud rates up to 38400.Description:

1) Baud Rate: 38400. Serial UART Mode

2) Packet Length: Variable (0 to 40) orFixed (1 packet).3) 60+ meters range Line of Sight / 30meters range indoors

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4)Multiple channel selection enablingupto 255 different pairs to work in the

same area5)Modes of operation: Config mode andRun mode.6) Onboard jumper Setting forConfig/Run Mode and Packet/ByteMode.7) Direct Replacement for wired Serial

Cable for and serial communication8) Working with CC2500 WirelessTransceiver module

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TEMPERATURE SENSOR (LM35)

LDR

HUMIDITY SENSOR PC (at receiver end)

LCD (Transmitter , Receiver)

Zigbee (Transmitter , Receiver)

LPC2148

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16/32-bit ARM7TDMI-S microcontroller ina tiny LQFP64 package.

8 to 40 kB of on-chip static RAM and 32to 512 kB of on-chip flash programmemory.

128 bit wide interface/acceleratorenables high speed 60 MHz operation.

One or two (LPC2141/2 vs. LPC2144/6/8)10-bit A/D converters provide a total of6/14 analog inputs, with conversion times

as low as 2.44 s per channel.

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The level of the content and its temperature is monitored bythe Microcontroller and displayed on the LCD.

A 16 X 2 LCD is used which displays 16 characters in two

lines.

LCD Display

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The system contains two parts. One istransmitter node and another one isreceiver part and both can be anynumber.

The transmitter part consists of whethersensors, microcontroller and ZigBee andthe receiver part consist of a PC

interfaced with Zigbee through PC serialport.

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In this project we deal with monitoringthe weather related parameters through

wireless Zigbee modules. Here we monitor temperature, LDR and

humidity with the help of respectivesensors.

The data from the sensors are collectedby the micro controller and transmittedto the receiver section through wireless

medium.

All the parameters are viewed by the pcusing program in the receiver side

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The programming of the LPC2148 controller is done

in either C language.

The program is simulated using Keil software.

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Defense Applications

Libraries

Temples Colleges

Seminar halls and conference rooms

Security for VIPs during their visit to publicplaces

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Road map products-tracking

Consumer electronics

PC Personal and healthcare

Commercial and residential control

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Source: http://www.zigbee.org/imwp/idms/popups/pop_download.asp?ContentID=7092

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In sum, using the ARM based LPC2148controller . We can Transmit the Signals,

with the help of Zigbee module. wireless

weather monitoring system whichenables to monitor the weatherparameter in an industry or anywhere byusing Zigbee technology and display the

parameter on the PCs screen. Somodern weather observation and forecasting

uses simple and the most advanced

technologies.

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