Introduction
The
Saver
V5.0
runs
simple
clock
emulation
program,
turns a
night
light on
and off
with
preset
time,
say
19:00 to
22:00
everyday.
The
design
features
low
cost,
easy
installation,
no
battery
backup
and no
EMI. The
AT89C2051
uses
external
oscillator
generated
by
Schmitt
trigger
gate
CD4093,
~680kHz.
Reference
frequency
was
derived
from
50Hz
main
line.
Time
setting
only
allows
at 18:00
by
pressing
time set
button
once. If
main
line has
failed,
functioning
LED will
blink at
high
rate .
Since
there is
no
battery
backup,
thus
repressing
the
button
is then
needed.
The
output
is
capable
of
driving
say, a
25W
incandescent
lamp.
Click
here for
more
detail &
source
code
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