D uring 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.
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.
0 comments:
Post a Comment