Download - The Bladeless Fan
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The
Bladeles
s Fan
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Project Introduction
The temperature controlled fancircuit will automatically
control the speed of fanaccording to thetemperature.
A temperature sensor isused to sense thetemperature.
The speed of fan
increases with the
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BLOCK DIAGRAM
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Explanation of block diagram
Temperature SensorBlock
Ampl!er Block"
The temperaturesensed by using LM 3. The output voltage ofLM 3 varies in linerproportion with thetemperature. The
sensitivity of LM 3 is!" m#$"C. %or ! "Coutput of LM3 is !"m#. %or !" "C output ofLM3 is !"" m#.
&utput signal frommicro'controller()C! is wea* so wehave to amplify that
signal. Ampli+er bloc*ampli+es the signalfor driving the +nalcontrol element i.e.
output device. %orampli+cation Transistor ,C - isused.
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Explanation of block diagram
ADC Block"Mcro#controller$oard "
ADC means analo% tod%tal con&erter' The
output o( s%nalcondtonn% s n theanalo% (orm'
But Mcrocontrollerre)ures nput n d%tal
(orm (or ths purpose*e ha&e to use ADC'The re(erence &olta%es +, -' The resolutono( ADC s ./ m-'
It s a lo*#po*er0 h%h#per(ormance CMOS 1#$t
mcrocomputer *th 2K $3teso( Flash 4ro%ramma$le and5rasa$le Read Onl3 Memor345ROM6' The de&ce smanu(actured usn% Atmel7sh%h#denst3 non&olatle
memor3 technolo%3 and scompat$le *th the MCS#,8'
B3 com$nn% a &ersatle 1#$tC49 *th Flash on a monolthcchp0 t pro&des a h%hl3:e;$le and cost e
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Explanation of block diagram
Output Block" Dspla3 Block"
/n this pro0ect we are
using %A1 as outputdevice. /f temperaturelies in the speci+edrange correspondingto the relays then %anwill rotate at the
preset speed . /n this pro0ect we are
using LCD display todisplay the ctemperature.
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W orking of the circuit
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W hat is relay?
2sually a relay is used in acircuit as a magnetic switchto turn on a second circuit.
A relay is an
electromagnetic switchwhich is activated when asmall current is passedthrough its coil.
The interesting fact is that
this small current is capableof turning on a secondarycircuit which wor*s onmuch larger current.
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Relay code
#include
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6d)antage and 2uture
*e)elopm ent This will help in saving the energy $
electricity.
4e can monitor more parameters li*ehumidity light and at the same time .
4e can send this data to a remote
location using mobile or internet
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