lefeirc RCbro SPARROW 3-OSD User manual

RCbro® SPARROW 3-OSD
LefeiRC www.lefeirc.com/
SPARROW 3-OSD
Manual v2.0

RCbro® SPARROW 3-OSD
LefeiRC www.lefeirc.com/
WARNING
Please strictly abide by relevant national laws and regulations
and fly safely. Before using the FC, you must fully understand the
safety details. The equipment and any electronic products on the
aircraft cannot be completely reliable. The necessary inspections
must be carefully performed before the flight.
Content
Parameter............................................................................................................................................ 3
Interface............................................................................................................................................... 3
OSD&LED............................................................................................................................................ 6
Flight Mode ........................................................................................................................................ 8
Preflight inspection.......................................................................................................................... 9
FAQ .....................................................................................................................................................10

RCbro® SPARROW 3-OSD
LefeiRC www.lefeirc.com/
Parameter
➢FC
SIZE：37*25*10mm
WEIGHT：15g
➢POWER
FC：5V
Battery：2-6S(MAX 80A)
VTX、Cammera：powered by battery or external BEC
➢RC RECEIVER
Protocol：PWM、PPM、SBUS、IBUS、CRSF
Telem：MAVLINK、CRSF
Interface
➢PORT

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CH1-CH4
PWM receiver,CH1-4: A-E-T-R;AUX3-6
RC
PWM receiver,Flight mode channel
PPM/SBUS/IBUS/CRSF
TX
GPS RX
RX
GPS TX
S1
AIL
S2
ELE
S3
THR
S4
RUD
S5
AUX1
S6
AUX2
CAM
Camera
VTX
VTX
B
VTX,CAM power supply
T1
MAVLINK/CRSF-telemetry
*It is recommended to remove the propeller during installation and debugging, pay attention to
safety!
➢How to power the VTX and camera
If the battery voltage is higher than the VTX or camera working voltage, must use an
external BEC power supply.
When the current is too large and the battery power supply capacity is insufficient, if
the image transmission and camera are powered by battery, it may cause the OSD to flicker.
At this time, it is recommended to connect a low ESR large capacitor in parallel with the FC,
such as 470uf/50V, etc.
In some ESCs, the battery voltage and 5V-BEC output voltage fluctuate greatly under
high current conditions, which will cause certain interference to the FC, such as OSD
flickering or even the sensor being affected, resulting in an attitude error. A low ESR large
capacitor is connected in parallel with the output terminal of the ESC (the closer the ESC is,
the better the effect). If space allows, a capacitor can be connected in parallel at the BAT and
ESC terminals of the FC.

RCbro® SPARROW 3-OSD
LefeiRC www.lefeirc.com/
➢Flight controller working voltage
FC is powerd by external 5v BEC.
➢High current working state
When the motor need to work with high current, it is recommended to plate tin on the
exposed pad, as shown in the figure below!
➢Remote control and receiver
◐ PWM
The flight controller supports 5 PWM inputs, including CH1-4 and RC. The specific
settings are that CH1 is AIL, CH2 is ELE, CH3 is THR, CH4 is RUD(A-E-T-R), and RC is the
mode channel. It is recommended to use a 3-SW for the mode channel.
◐ PPM SBUS IBUS CRSF
Just connect the signal to the RC channel, the FC will automatically recognize it, the
channel sequence is A-E-T-R, and the mode channel is CH5 by default. Some CRSF(ELRS)
receivers have only two states for CH5, which makes it impossible to switch the three flight
modes. At this time, you can change the mode channel to CH6 in the OSD setting item.
◐ Calibrate the RC
Ensure that the throttle is at the lowest level before calibration, and other sticks have no
offset .Select the <RC CALI> item, when <CFM?> appears, quickly dial the mode
channel(CH5/CH6) several times to complete the calibration. If <ERR> is displayed after
calibration, it indicates that the calibration failed. If the calibration fails and the RC cannot be
calibrated again, you can turn the roll and pitch stick to the MAX, and then restart the FC , it
will automatically enter <RC CALI> .
◐ RSSI
RSSI channel can be selected, and the range of RSSI value is the same as that of other
channels.

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◐ Tips
When using the RC, there is no need to set the mixing mode, the user can select the
appropriate model in the OSD setting menu; when entering the OSD setting menu, do not
limit the travel of the sticks.
➢InstallDirection
*Need to re-calibrate the level after changing the installation direction.;The installation direction
should point to the aircraft head as shown in the picture.
OSD&LED
➢MAIN
1
Flight Mode
10
GroundSpeed
2
Time
11
Attitude Line
3
Volatge
12
Altitude
4
Current
13
Climb Rate
5
Distance
14
Voyage
6
Return Home Angle
15
Power Consumption
7
Satellite
16
AIL Angle
8
RSSI
17
PITCH Angle
9
Throttle
18
Latitude and Longitude

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*OSD menu item <GPS> can set whether to display the latitude and longitude information.
*The GPS icon will continue to flash when GPS is not connected or GPS is not fixed.
*‘>’ means to turn right, ‘<’ means to turn left, and the number after it indicates the specific
required turning angle.
*If the RC icon flashes, it means that the RC is failsafe or the receiver is disconnected. If the GPS
has been fixed at this time, it will automatically switch to the RTH.
➢CONTROL OSD MENU
Enter Menu
Quickly dial CH5/CH6
Exit
AIL LEFT
Enter
AIL RIGHT
UP/DOWN
ELE UP/DOWN
➢PARAMETERS
FRAME
T-TAIL、V-TAIL、WING
INSTALLATION
InstallDirection
ROLL/PITCH/YAW
GAIN
Set the gain, the YAW gain only works in ACRO .
ROLL/PITCH/YAW
DIRECTION
Set the output directions of servos.
RC CALI
Calibrate the RC
LEVEL CALI
LEVEL CALI
VOL/CURRENT CALI
Set voltage/current offset.
CRUISE SPEED
Flight speed in RTH.
RTH ALT
SAFE ALT
In RTH, if the distance is beyond 3 times the circling
radius, the min flying altitude is <SAFE ALT>. If it is
higher than this altitude, it will slowly descend; after
approaching the HOME, the fly altitude is <RTH ALT>.
FENCE RADIUS
If the distance exceeds this radius, RTH will be triggered.
RTH RADIUS
Circle radius.
MODE 1/2/3
The flight mode corresponding to each position of the
mode channel(CH5/CH6).
ACRO GAIN
Stability gain in ACRO.
VEL GAIN
The faster the speed, the smaller the required gain, and
the larger <VEL GAIN> should be.
AUX1-6[1]
Set AUX function(AXU3-6:CH1-4)
AUX1-6 DIRECTION
Set the output direction of the AUX.
GPS
Whether to display latitude and longitude.
TELE
MAVLINK:MAV1-57600, MAV2-115200,CRSF telemetry
RSSI
RSSI
MODE-CH
Select mode channel
HOS/VOS
Set OSD offset.
THR-DIFF[1]
Throttle differential ratio controlled by YAW.
MANUAL[1]
Sticks control ratio in ACRO mode.
PORT[1]
PWM:CH1-4 is PWM receiver channel.
AUX:CH1-4 is AUX3-6.
GPS RESET[1]
GPS RESET
LANGUAGE
Chinese and English.

RCbro® SPARROW 3-OSD
LefeiRC www.lefeirc.com/
[1]Since the FC has undergone an upgrade, these setting items are added later. If your FC does
not have it, don't worry, it will not affect your flight performance.
*When setting the AUX function, RC6-12 means the remote control 6-12 channel.
*< FENCE RADIUS>only works in fence mode, other modes do not have fence function.
*After changing the <TELE>, you need to restart the FC.
*After changing the <PORT>, you need to restart the FC. If it is set to AUX, the AUX3-6 setting
items will be automatically added after restarting.
➢Flight Summarize
After land, OSD will show summarize about flight info.
Quickly dial mode channel(CH5/CH6) to exit.
➢LED
GREEN
Quick flash
RTH/ALTHOLD/FENCE
Flash
MANUL/ACRO
On
STAB
RED
Flash
GPS NoFix
On
GPS Fixed
Off
NO GPS
➢GPS
The FC supports UBLOX protocol, but does not support NMEA. After power-on, the FC
will automatically configure the GPS. If the FC cannot recognize the GPS latitude and
longitude, you can reset the GPS through the setting item <GPS RESET>.
Flight Mode
➢How
MAN
The airplane is direct controled by RC.
STAB
Control the angle of airplane,and auto level when no RC input.
ACRO
Gyro mode,lock the current angle when no RC input.
ALT
Hold current height when no ELE input.
FENCE
Auto Retun Home when out of fence radius.
RTH
Auto Retun Home.
* FENCE and RTH can only be used when the GPS is fixed, otherwise it will become the ALT.
➢Assisted Takeoff
ALT/FENCE: Push the throttle to enough power, after takeoff(throw it away), the aircraft will
climb to 20m automatically.
RTH Mode: Push the throttle to enough power, shake the aircraft or run, then the motor starts
slowly, and then take off after the power is enough(throw it away), the aircraft automatically
climbs and circles over HOME.
➢Throttle control
MAN/STAB/ACRO/ALT: Throttle is direct controlled by RC.
FENCE: Before triggering RTH, the throttle is controlled by RC, after triggering, it is determined
by RTH.
RTH: Throttle is controlled by RC during assisted takeoff, after entering the circling state, the
throttle is controlled by the FC, it automatically adjusts the throttle according to the cruise
speed you set, you can manually push the throttle up (beyond the throttle calculated by the
FC) to increase cruise speed, but you can't pull it down.
➢Throttle differential
When an AUX port is set to throttle, and the <THR-DIFF> is not zero, then you can
control the differential rotation of the two motors by YAW channel. It is necessary to pay
attention to whether the direction of the speed change of the two motors is correct, if it is

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not correct, just swap the two ESC signal wires.
Preflight inspection
➢Feedback direction
*If the feedback direction is not correct, you can invert the channel in OSD.
*The feedback direction must be set first, then the RC control direction.
➢RC control direction
*If the control direction is not correct, you can set the channel output reverse in the RC.
*After setting the feedback direction, the control direction can only be modified in the RC.
➢FailSafe
When the RC that outputs PWM/PPM/IBUS/CRSF is failsafe, there are usually three
states that can be set.They are: cut (no output), pos hold (hold the output at the last
moment before failsafe), custom (the user sets the output when failsafe), of course, different
RC will be different.
Cut mode: the FC can automatic recognition as failsafe,and switch to RTH;
Pos hold: this mode is not recommended.
Custom mode: the user sets the output data of each channel when the RC is failsafe, to
ensure that the output of the mode channel(CH5/CH6) can make the FC switch to RTH
when the RC is failsafe. Therefore, RTH must be included in the three modes set in the OSD.
PWM/PPM/IBUS/CRSF: it is recommended to use cut mode or custom mode.
SBUS: the FC can automatic recognition as failsafe,and switch to RTH.

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*If you use custom mode, in order to simplify the operation, set the mode channel in the RC to
output an arbitrary value, and then observe which mode the FC switches to after losing control,
and then change the mode to RTH in the OSD. For example, after the RC is failsafe, the flight
mode is automatically switched to A, then just set the position of A to RTH in the OSD.
➢LEVEL CALI
Before calibration, place the FC horizontally and keep it still; if it has not been calibrated
for a long time or the installation direction has been changed, needs to be re-calibrated.
➢Armed
NO GPS: after the FC is initialized, it will be automatically armed, and the motor can be started
in all modes at this time.
With GPS: after GPS fixed, except for RTH, the motor can be started at will, but before fixed,
only MAN can start the motor.
➢Calibrate ESC
Step1：Switch to manual mode, push throttle channel to the max;
Step2：Power on(longer waiting time than directly connected receiver).
Step3：After ESC Beep, push throttle channel to zero.
FAQ
Q.Is the automatic action of the servos normal in RTH?
A.Yes. This is normal for RTH.
Q. Is there any output from the throttle channel when switching to RTH during flight?
A. It is recommended to switch to RTH after flying for more than 6 seconds. At this time, the
throttle is automatically controlled by the FC.
Q.Why does the motor keep beeping?
A. <Throttle control> & <Armed>
Q.RTH or FENCE mode becomes ALT.
A.RTH and FENCE can only be used when the GPS is fixed, otherwise it will become the ALT.
Q. Does the FC support telemetry of devices such as FM30 and HM30?
A. Yes. The FC can output the MAVLINK protocol with two baud rates of 57600 and 115200.