lefeirc SN-L User manual

SN-L user manual
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SN-L
FixedWingFLightController + Pixel OSD
Ver 2.5
FW 5.8+
LeFeiRC
2019/1/10

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WARING：
Please strictly observe the relevant national laws and regulations for safe flight. We do not advocate
flying high, flying far, experience the fun of the model airplane in a fully safe environment, and create a
good environment for model airplane sports! Before using the flight control, you must fully understand
the various safety details and deeply understand that the flight is risky. It is impossible to be completely
reliable on the equipment and any electronic products on the aircraft. You should use the Sinan (SN_L)
fixed-wing flight control to evaluate the product and use the system according to relevant regulations.
The system provider does not use the product for any use. Responsible for direct or indirect losses and
consequences.
i. 目录
1. INTERFACE ................................................................................................................................................... 3
2. FLIGHT MODE ............................................................................................................................................. 3
3. SWITCH FLGHT MODE ............................................................................................................................. 4
4. INSTALLATION ............................................................................................................................................ 4
5. OSD................................................................................................................................................................. 5
6. REMOTE CONTROLLER ............................................................................................................................ 5
7. PRE-FLIGHT CHECK................................................................................................................................... 6
8. FLIGHT AND CONTROL ........................................................................................................................... 7
9. OSD ACTION ............................................................................................................................................... 7
10. Firmware upgrade ................................................................................................................................. 8

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1. INTERFACE
RSSI Connect to receiver RSSI channel
PPM Connect to SBUS/PPM
A1 Extend other functional interfaces
A2 Extend other functional interfaces
AIL Aileron servo interface
ELE Elevator servo interface / Airspeed interface
THR ESC interface
RUD RUD servo interface
GPS Connect to GPS
PMU Power/Camera/VTX/Current, all in one interface
 CONNECT AIR-SPEED METER
Step1: set AUX1/AUX2 channel as ELE function
Step2: connect ELE servo to AUX1/AUX2 channel
Step3: connect airspeed meter to ELE channel
Step4: power on again
If you should change ELE servo direction, you should set AUX1/AUX2 channel direction
 POWER SUPPLY
All above interfaces are powered by the external 5v BEC module, and the flight controller does not output 5V to supply power
to these interfaces.
2. FLIGHT MODE
MANUAL Remote control directly controls the aircraft
STAB Auto level
HORIZON ACRO mode + STAB mode
RTH Return to home
HOVER Altitude hold and cycle。
ALTHOLD Aircraft hold altitude and flight route(with GPS)
GUID Keep on the route
ACRO Gyro mode
SUB-MODE Switch mode to slave mode
 RTH MODE
When the return altitude is higher than the set height, for example, returning at a height of 150m. If the set return altitude
is 120m, the aircraft will return at a height of 150m, and then decrease the altitude to 120m when approaching the home
position. If the return altitude is less than 30m, the aircraft will climb to 30m before turning. The RC cannot control the aircraft
during the RTH mode, but the throttle can be raised by the throttle stick.
In auto cruise mode, the throttle is automatically calculated based on the speed (airspeed or ground speed). In the case of
a downwind or a large wind, the throttle can be raised by the remote control to prevent the aircraft from stalling. for example
if auto throttle is 45%, but the RC throttle is 50%, then FC output 50% throttle.
 GEO FENCE
When the fence is turned on, the RTH mode is triggered once the height or distance exceeds the fence radius. The way to

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cancel the RTH mode is to switch the mode switch once. If you do not cancel, you can dial the mode switch several times.
3. SWITCH FLGHT MODE
SN_L sets the RC channel 5 as the main mode switch, so the 5th channel of the RC must be set to a three-segment switch; the
SUB-MODE switch can be selected or not used when the remote controller is calibrated.
Example:
Position Mode switch SUB-Mode Switch
1 STAB RTH
2 SUB-MODE HOVER
3 ALTHOLD MANUAL
4. INSTALLATION
① PMU MODULE
 Before power on FC, please check everything is correct.
install direction： <BASE FUNCTION> -<AP DIRECTION>
0° Arrow point to head
180° Arrow point to rear
90° Arrow point to Left side of the nose
270° Arrow point to right side of the nose
The FC installation should try to avoid the vibration source and keep away from the motor; try to install it near the center of
gravity. Be sure to recalibrate the level after changing the installation direction
② HOW TO CONNECT SERVO
Interface
Type
AIL ELE THR RUD AUX1 AUX2
Wing Servo1 Servo2 ESC ALL ALL
T tail AIL servo ELE servo ESC RUD servo ALL ALL
V tail AIL servo ELE servo1 ESC ELE servo1 ALL ALL

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③ CORRECT CONTROL SURFACES MOVEMENT
5. OSD
Speed unit’ Km/h’ or ‘Mile/h’; Distance unit ‘m’ or ’Ft’. flight summary after landing
6. REMOTE CONTROLLER
 CALIBRATE RC
Make sure the 5th channel as mode switch is a three-segment switch.
When a new RC is connected to the FC, it will pop up a calibration screen:
Page1：reset all channels，flip mode switch enter next step Clear all offsets, sticks is homed, and the RC does not set the range limit
Page2：throttle Up，flip mode switch enter next step Get throttle MAX value
Page3：throttle Down，flip mode switch enter next step Get throttle MIN value
Page4：Keep the AIL stick to the Left, flip mode switch enter next step Get AIL channel MIN value
Page5：Keep the ELE stick to the Down, flip mode switch enter next step Get ELE channel MAX value
Page6：Keep the RUD stick to the Left, flip mode switch enter next step Get RUD channel MIN value
Page7：flip subMode switch，flip mode switch enter next step Detect subMode switch
 ENTER RC CALIBRATE： <BASE FUNCTION> - <CALI RC>
① When you can’t enter RC calibrate menu for some reason； follow steps like this:
Power on FC -> make RC sticks move to the side-> wait until RC calibrate menu display
② Before OSD initialization is complete, don’t move sticks, otherwise you would enter RC calibrate menu again
③ After calibrate，don‘t change RC channel offset
 FAIL-SAFE
PPM receiver FC can’t recognize whether the RC is out of control, need to be set in advance.
SBUS receiver can automatically identify if it is out of control，move stick to cancel failsafe mode.

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ENTER OSD MENU <BASE FUNCTION> - <FAILSAFE MODE>
FAILSAFE MODE
GPS connect, satellites>6 GPS disconnect/GPS lose signal
HOLD Hold current mode Hold current mode
RTH Return to home Switch to stab mode, close throttle, Circling down①
STAB Switch to stab mode, close throttle, Circling
down
Switch to stab mode, close throttle, Circling down
①The AIL is 10 degrees to the left, the ELE is 15 degrees down, and the throttle is closed.
 RSSI
① Support independent RSSI and RSSI signal channels in SBUS or PPM signals; can be selected by OSD menu.
② The independent RSSI automatically recognizes the RSSI signal type, PWM or AD type; the RSSI signal of some models of
receivers may cause the OSD picture to flicker due to the RSSI modulation into a high frequency pulse signal.
③ FC does not return to home based on the RSSI signal value.
④ If connect a SBUS receiver, you Set RSSI channel to 18, <OSD SETTINGS MENU> - <SENSOR> - <RSSI CHANNEL> , FC will auto
calculate RSSI according to SBUS signal packet loss rate.
 CALIBRATE ESC
Step1: switch to manual mode.
Step2: unplug the ESC signal line and wait for ESC to make a di---di---di--- sound.
Step3: move the throttle stick to the max position, then plug in the ESC signal line.
Stpe4: hear di—di—, then move the throttle stick to the lowest to complete the calibration.
 ARM&DISARM
Satellites <=6 >6
GPS connect DISARM ARM
GPS disconnect ARM ARM
*If flight mode is manual mode, you can control the throttle in any situation
7. PRE-FLIGHT CHECK
 CHECK ACCEL HEALTH <OSD>-<SCOPE>-<HEALTH>
① The vibration is in good condition. When the plane is flying flat, the vibration point is scattered within the two warning lines.
② The vibration is large, and most of the vibration points fall outside the warning line, which easily leads to the FC
can’t calculate the correct attitude

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 CALIBRATE LEVEL <SENSOR> - <CALI LEVEL>
① Horizontal calibration is required after changing the mounting direction.
② If you have not calibrated for a long time or the temperature difference has changed too much, you need to
recalibrate.
③ Ensure that the aircraft is level and static during horizontal calibration.
 SENSITIVITY ADJUSTMENT
① <BASE FUNCTION>-<AIL BASE GAIN> -<ELE BASE GAIN> -<RUD BASE GAIN> : The larger the value, the faster
the reaction speed and the excessive jitter.
② <ADVANCE FUNCTION>-<STAB GAIN>-<FEED FORWARD GAIN>: The larger the value, the faster the
response joystick will be, and the jitter will be exceeded.
③ Adjustment steps:
Step1: set <FEED FORWARD GAIN> , normally reduce feed forward gain to 40
Step2: set the <AIL BASE GAIN> <ELE BASE GAIN> <RUD BASE GAIN> . You can fly by default, then increase or decrease the
sensitivity according to the state of flight.
④ Speed PID Factor <ADVACE FUNC>-<STAB GAIN>-<SPEED PID FACTOR>
PRINCIPLE: the faster the speed, the smaller the rudder surface sensitivity should be. The greater the value, the
greater the speed involved in PID control.
EXAMPLE: when speed of the aircraft is very fast, the aircraft begins to shake; then you can increase <SPEED PID
FACTOR> value.
8. FLIGHT AND CONTROL
 AUTO TAKEOFF
① ALT-Hold mode：Push the throttle to enough power and the aircraft will automatically climb to a height of 20m.
② RTH mode:
1.1 <TAKE OFF SPEED > more than zero, push throttle stick away from the zero position, give plain a speed until motor start.
1.2 <TAKE OFF SPEED> equal zero, push throttle stick away from the zero position, shake the aircraft, until motor start.
Aircraft will auto climb at 30m.
 SPEED CONTROL
① Disconnect Airspeed
Speed is controlled by the ground speed, cruising speed set in <ADVANCE FUNCTION> - <CURISE SPEED> .
② Connect Airspeed
Speed is determined by airspeed, Preventing the wind from flying in the head, causing the ground speed to be too small,
please set <MINIMUM GROUND SPEED>.
9. OSD ACTION
* in flight can’t enter the setup menu
Enter OSD menu Flip mode switch twice
AIL move left Exit the current menu or exit the selected mode
AIL move right Enter menu or select setting item
ELE move up or down Change item index or select parameter

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10. Firmware upgrade
 Download upgrade software and drivers and install：install “CP210x USB to UART Bridge” driver.
https://github.com/HelloLeFei/SN_L/releases
www.lefeirc.com
 Connect via USB：Select correct com ID.
 Upgrade SN_L
Step1: power off FC at first
Step2: Select “SN_L”
Step3: load firmware and flash,
Step4: Before the end of the countdown, power on FC