automatic speed controller for fans and coolers
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harshit12
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#1
26-03-2010, 05:31 PM


please upload full report regarding this topic.
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seminar-avatar
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#2
30-03-2010, 05:36 PM

Hi,
visit this thread for more details on this topic:
topicideashow-to-automatic-speed-controller-for-fans-coolers?pid=13633#pid13633
topicideashow-to-automatic-speed-controller-for-fans-coolers?mode=linear
topicideashow-to-automatic-speed-controller-for-fans-coolers?pid=13633#pid13633
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
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nanda ganesh kumar
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#3
29-09-2011, 01:44 PM

hi friend i need ppt and documentation for this project and implimentation plz answer to my request as soon as possible
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seminar addict
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#4
30-09-2011, 09:52 AM

to get information about the topic " automatic speed controller for fans and coolers" please link bellow

topicideashow-to-automatic-speed-controller-for-fans-coolers?pid=13633#pid13633
topicideashow-to-automatic-speed-controller-for-fans-coolers?mode=linear
topicideashow-to-automatic-speed-controller-for-fans-coolers?pid=13633#pid13633
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#5
07-03-2012, 10:30 AM

i wanna circuit diagram of automatic speed controllers for fans and coolers
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seminar flower
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#6
16-10-2012, 10:57 AM

AUTOMATIC SPEED-CONTROLLER FOR FANS AND COOLERS



.pdf   AUTOMATIC SPEED CONTROLLER.pdf (Size: 142.32 KB / Downloads: 18)

During summer nights, the temperature is initially quite high. As time passes, the
temperature starts dropping. Also, after a person falls asleep, the metabolic rate of one’s
body decreases. Thus, initially the fan/cooler needs to be run at full speed. As time
passes, one has to get up again and again to adjust the speed of the fan or the cooler.
The device presented here makes the fan run at full speed for a predetermined time. The
speed is decreased to medium after some time, and to slow later on. After a period of
about eight hours, the fan/cooler is switched off.
Fig. 1 shows the circuit diagram of the system. IC1 (555) is used as an astable
multivibrator to generate clock pulses. The pulses are fed to decade dividers/counters
formed by IC2 and IC3. These ICs act as divide- by-10 and divide-by-9 counters,
respectively. The values of capacitor C1 and resistors R1 and R2 are so adjusted that the
final output of IC3 goes high after about eight hours.
The first two outputs of IC3 (Q0 and Q1) are connected (ORed) via diodes D1 and D2 to
the base of transistor T1. Initially output Q0 is high and therefore relay RL1 is energised.
It remains energised when Q1 becomes high. The method of connecting the gadget to
the fan/cooler is given in Figs 3 and 4.
It can be seen that initially the fan shall get AC supply directly, and so it shall run at top
speed. When output Q2 becomes high and Q1 becomes low, relay RL1 is turned ‘off’ and
relay RL2 is switched ‘on’. The fan gets AC through a resistance and its speed drops to
medium value. This continues until output Q4 is high. When Q4 goes low and Q5 goes
high, relay RL2 is switched ‘off’ and relay RL3 is activated. The fan now runs at low
speed.
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