30-07-2010, 08:55 PM
The features of this device are:
5 speed fan regulator, Digital display, Timer, Low temperature shutdown switch and also a Buzzer
This circ uses PIC 12F675 from Microcchip and CD D4026 (De cade Counters/Dividers +
Decoded 7 Segment Display Outtputs).
How to Operate
As IR pulses are received, circuit will count up an the increase of fan speed. speed can be controlled from 0-5.current. The seleection of the user is displayed on seven segment display also for convenience.
Timer mode:
To enter timer mode go to 6th possition and then wait for sometime. The green LED turns On and the seven segment display goes off.
How to turn off the timer
For this we have to simply go to 0th position a wait abo 5 second. Then the timer morde will be deactiveted . But
Once timer is activated circuit is se to depend on temperature of the surroundings and the fan will turn off if the temperature goes below 28 degrees celcius.
For more details refer this pdf:
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