YS-S4 Multi-rotor Autopilot User Manual V1.4
27
Appendix
LED
Indicator
Interpretation:
The
working
status
of
the
S4
is
basically
indicated
by
the
GREEN
+
RED
LEDs,
see
below:
Flight
Status
LED
status
Description
Manual
（
GPS
NOT
LOCKED
）
1
second
GREEN
and
1
second
RED
Manual
（
GPS
LOCKED
）
2
seconds
Green
once
per
loop
Manual
altitude
‐
hold
2
seconds
GREEN
and
1
second
RED
Auto
‐
hover
3
seconds
GREEN
First
stage
low
voltage
alert
2
seconds
RED
Final
stage
urgent
low
voltage
alert
3
seconds
RED
Return
and
Land
Continuous
RED
flashing
Magnetic
compass
calibration
Continuous
GREEN
flashing
IMU
Error
Continuous
YELLOW
flashing
The
autopilot
can
calculate
the
low
voltage
alert
according
to
the
Cell
Number
filled
in
by
the
user.
“Final
stage
low
voltage
alert
Number”=
(Voltage
per
cell
‐
0.05v
)
*
Cell
Number
E.g.
voltage
per
cell
3.7
‐
0.05v
=3.65
multiplied
by
cell
number
=
total
voltage
(14.6v
for
4
cells)
When
the
final
low
voltage
alert
is
indicated,
the
craft
will
land
(You
can
adjust
the
landing
position
during
landing
but
make
sure
you
DO
NOT
push
the
THR
stick
during
this
operation.)
