BX
688
User
Guide
Reasons
of
Non-alarming
1.
Inappropriate
installation
location
A
suitable
location
of
the
device
should
be
this:
when
the
driver
looking
ahead,
the
green
light
will
light
up
or
flash
(if
green
light
always
keeps
on,
it
is
the
very
good
position;
when
the
driver
close
the
eyes,
the
green
light
is
off.
2.
Unfinished
face
recognition
After
detecting
the
driver,
BX
688
will
identify
the
face
characteristics
first,
it
doesn’t
start
monitoring
the
fatigue
until
finishing
the
face
identification,
and
the
identification
time
is
different
for
different
drivers.
Usually
the
device
can
enter
the
alert
status
after
1
minute’s
normal
driving,
it
takes
around
5
minutes
at
most
to
enter
into
alert
status
for
some
people
wearing
glasses.
This
won’t
affect
the
using
as
the
driver
won’t
get
into
sleep
during
the
first
several
minutes
’
of
driving.
3.
The
previous
alarm
interval
is
too
short
During
normal
driving,
the
driver
will
be
waked
up
by
the
alert.
In
order
to
avoid
the
drivers
to
be
tired
of
the
excessive
interference,
or
the
driver
wants
to
a
rest
stop,
before
re-entering
the
warning,
BX
688
only
alarms
again
after
10
seconds
of
the
first
alarming.
So
in
the
test,
BX
688
will
not
alarm
if
you
simulate
the
fatigue
state
too
quick
after
the
previous
alarm.
4.
Impact
by
the
big
movements
BX
688
is
very
intelligent.
If
the
driver
is
detected
a
substantial
movement
in
the
early
warning,
it
shows
that
there
is
no
sign
of
driver’s
fatigue.
In
that
case,
BX
688
only
issue
the
friendly
reminder
after
detecting
the
driver’s
fatigue
state
for
4-7
seconds.
5.
Unstable
power
If
you
use
another
power
supply
for
testing,
the
power
supplies
may
be
insufficient
capacity,
or
the
interference
is
too
large.
That
will
affect
BX
688
to
work
properly.
Please
use
good
quality
power
supply
or
the
car
power
supply
in
the
car
for
testing.
Copyright
2013
TTI
.
All
right
reserved.
