JIYI K3-A User manual

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K3-A
USER MANUAL
Ver.1.0.6
Last updated:2017/07/24
Thank you for choosing K3-A flight controller. Hope you will have a good
flight with K3-A. We strongly recommend you to read this manual
carefully before you install K3-A flight controller. The following
instructions will help you to make your K3-A flight controller work
perfectly.
Note: This manual shall be used together with the K3-A assistant
software. If you find differences between this manual and the assistant
software, please follow the assistant software.
If you have any difficulty during the usage, please contact with JIYI
Robotic Co., Ltd. at [e-mail]

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Content
1. Technical Terms and Abbreviations ............................................................................... 5
2. Packing List.............................................................................................................................. 5
3. Setup Wizard........................................................................................................................... 6
3.1 Aircraft Types............................................................................................................... 6
3.2 Wiring Diagram ........................................................................................................... 6
3.3 FCU Setup ...................................................................................................................... 8
3.4 GPS Setup ...................................................................................................................... 8
4. Configuring by Assistant Software............................................................................... 10
4.1 Installing driver and Assistant Software .......................................................... 10
4.2 Connect to the FCU .................................................................................................. 11
4.3 The configuration FCU ............................................................................................ 12
5. Fligth ........................................................................................................................................ 13
5.1 Flight mode introduction....................................................................................... 13
5.2 Advanced Fountion .................................................................................................. 13
5.3 Introduction to the Functions of Remote Controller ......................................... 23
Appendix：................................................................................................................................. 28
Appendix1 Product Specification：........................................................................... 28
Appendix2:LES STATUS DESCRIPTION ..................................................................... 30
Appendix3 :JIYI Technical Suppport.......................................................................... 31

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Disclaimer
Kindly Reminder: K3-A is not a toy, please read the manual carefully before you use
this product. Upon reading this, you’re deemed to agree with the disclaimer, this
products is not suitable for people aged below 18 years old.
This product is a professional flight controller developed by JIYI for industrial
application. Under the normal electric supply and instant condition, this controller
can satisfy plant protection, mapping, Aerial photography and other purposes . JIYI
is always aiming high quality, reliable and stable products. As safety consideration,
we strongly recommend you to remove the propeller during the configuration,
ensure the wiring connection and electric supply are in place, and stay away from
crowd, fragile and dangerous objects during the flight. If any of below reason (not
limited to below reason) occur during the use of our products, JIYI shall not be
liable for any direct or indirect loss, damages and injuries that result from the usage
of our products. JIYI shall only be responsible for flight controller damaged which is
caused by the controller itself. JIYI shall not be liable for any other form of Liability
and Compensation.
1.User do not follow the manual during the usage;
2.Weak structure of aircraft or damage on aircraft structure;
3.User using third party product which caused the abnormal flight;
4.User’s wrong judgment or improper handling;
5.User intended to against others;

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6.User continue with the flight even though knew that the product is function
abnormally;
7.Flying under the condition of strong interference, radio interference and
prohibited area or vision unclear or blocked or unable to judge and identify the
flight condition;
8.Under bad weather condition or not suitable flight condition;
9.Abnormal working condition of flight controller where caused by user tearing or
modifying the JIYI product and accessories;
10.Flight where user under drunk, drug abuse or any other unhealthy condition;
11.Any others products defects which is not caused by JIYI products.

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1. Technical Terms and Abbreviations
CH
Channel
FS
Fail Safe Protection
FCU
Flight Controller Unit
PMM
Power Management Module
ESC
Electronic speed controller
JIYI
JIYI Robotics CO.,Ltd.
2. Packing List
Standard Packing:FCU1, PMM 1, GPS/Magnetic Compass Module 2, GPS
Folding bracket 2, LED Module 1, Dupont cables8, Micro-USB cable1,
3M MoveDots(ROUND)2, 3M MoveDots (STRIPE)2
The Optional Module : Flow Sensor 1; Radar Module 1;
Bluetooth Datalink 1 ;RTK Module1;

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3. Setup Wizard
3.1 Aircraft Types
Supported Aircraft Types are showing in the following figures:
Notes :
(1) It uses the yellow arms to show the nose direction;
(2) Those marked numbers matches the input ports M1 to M8 of FCU;
(3) The upper propellers of coaxial multicopter indicates by green and the lower
indicates by red.
3.2 Wiring Diagram
3.2.1 Instruction of Ports

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The port definitions of K3A is showing in the following table:
2、Overall Wiring Diagram
M1
Connects to ESC 1 #
POW
Connects to power management
module
M2
Connects to ESC 2 #
GPS
Connects to GPS module
M3
Connects to ESC 3 #
LFS
Connects to flow sensor
M4
Connects to ESC 4 #
PUMP
Communicates to water pump
M5
Connects to ESC 5 #
CH6
Communicates to the second
water pump
M6
Connects to ESC 6 #
CH5
PWM output, controlled by OUT2
M7
Connects to ESC 7 #
CH4
PWM output, controlled by OUT1
M8
Connects to ESC 8 #
CH3
Connects to switchlevel meter
RTK
Connects to GPS2 module or RTK
module
CH2
Connects to percentage level
meter
EXT
Connects to radar module
RC/CH1
Connects to PPM/SBUS receiver
LINK
Use USB to connects to Assistant2
or use datalink to connect to APP
LED
Connects to LED tricolored light
module

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3.3 FCU Setup
3.3.1 The Direction of K3A FCU
Please choose a direction as the following figure shown. And set the
corresponding configuration in the Assistant2 Software.
PATH: Basic Setting ->Installation - > IMU Direction. ( Nose direction indicates
by the red arrow).
3.3.2 Installation Position
(1) The K3A FCU must be face-up. Please don’t invert it and try your best to keep
paralleled .
(2) In order to guarantee the best flight effect, we suggest to install FCU horizontally
in the gravity center of the aircraft.
(3) The internal vibration reduction system has been assembled in FCU, so please use
tough 3M movedots to fix the FCU.
3.4 GPS Setup
3.4.1 Install Direction
Please choose a direction as the following figure shown.And set the
corresponding configuration in the Assistant2 Software.
PATH:Basic Setting ->Installation - >GPS direction . ( Red arrow indicates the
nose direction).

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3.4.2 Installation Position
(1) GPS module should be installed as high as possible. And keep it far away from
ESC, power wires, motors and battery;
(2) Ensure to fly in open environment (no shield);
(3) Avoid flying under magnetic interference;
(4) Please don’t put magnetic stuff close to the GPS, otherwise it could be cause to
permanent damage of the compass.

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4. Configuring by Assistant Software
4.1 Installing driver and Assistant Software
1、Boot up the computer, and then visit JIYI’s official website （www.jiyiuav.com）.
Download the driver program and K3A Assistant2 software;
2、Run the installation program of the driver and the assistant software installation
program;
3、After the installation is completed, open the assistant software. The interface is
shown as below:

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Attention: USB port of computer just can supply 0.5A current at most for flight
controller. If there are excessive peripherals mounted on flight controller, it
would lead to insufficient power supply and connection failure, and at this
moment it needs power supply. The propeller must be discharged when you use
power supply, meanwhile the motor should be turned off.
4.2 Connect to the FCU
Click the “Connect” button , the following interface shows the FCU had beed
connected successfully.

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4.3 The configuration FCU
Please read < ASSISTANT2>

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5. Flight
5.1 Flight mode introduction
5.1.1 ATT-STA
ATT-STA is the basic mode of all flight mode ,which only depends on the
IMU .And it couldn’t be influenced by other sensors. It’s the most stable and safest
flight mode.
1、Working condition
The ATT-STA mode can be switched in any status. And it also supports arm and
disarm the FCU. If the aircraft is in the mode, LED will be flashed single green.
2、Operation description
Switch CH5 of the remote controller to the ATT-STA mode. Arm FCU and push
the throttle until the aircraft taking off. The taking-off throttle depends on the driver
system of the aircraft. Because of the advanced algorithm of flight controller, you can
easily make aircraft hover without controlling the throttle lever under indoors or
breezeless environment.
To find the respective function of the stick, please refer to the following table:
ATT-STA
Channel setting
Description
CH1
Control roll angle
To change the desire roll angle of aircraft
CH2
Control pitch angle
To change the desire pitch angle of aircraft
CH3
Control throttle value
Different from ATT-ALT mode, flight
controller doesn’t involve in altitude
control. the hover-throttle value will be
changed with the driver system of aircraft.
CH4
Control the rate of yaw
To change the desire rate of pitch angle
5.1.2 ATT-ALT
ATT-ALT mode is suitable for central-control remote controller. In the mode,
IMU and Barometer will both involve in flight control.

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1、Working condition
The ATT-ALT mode can be switched in any status. And it also supports arm and
disarm the FCU. If the aircraft is in the mode, LED will be flashed single green.
2、Operation description
Switch CH5 of the remote controller to the ATT-ALT mode. Arm FCU and push
the throttle. If throttle stick under 50%, motors will be idling. And you can push the
throttle stick gently to make the aircraft take off. If the throttle is placed in 50%
position, the aircraft will be in alt-hold flight .
To find the respective function of the stick, please refer to the following table:
ATT-ALT
Channel setting
Description
CH1
Control roll angle
To change the desire roll angle of aircraft
CH2
Control pitch angle
To change the desire pitch angle of aircraft
CH3
Control speed of altitude
Different from ATT-STA mode, flight
controller would involve in altitude
control. When the throttle is in the middle,
the aircraft stays in constant altitude.
CH4
Control the rate of yaw
To change the desire rate of pitch angle
5.1.3 GPS-ANGLE
GPS-ANGLE mode is the most commonly flight mode, and it can meet with most
demands of customers on flight control. In the mode, Besides IMU and Barometer,
compass and GPS also involve in flight control.
1、Working condition
Owning to use GPS to control the aircraft, so it has to wait for the complete of
searching satellite and achieve to the required positioning precision. You can arm the
aircraft, when GPS status in normal ,good or RTK positioning. The following table
shows different LED status with different GPS status.
GPS Status
Indicator Light Status
Priority
Unconnected GPS/GPS no
receives satellite
Red indicator blinks for three times
Low
Bad signal
Red indicator blinks twice
low
Normal signal
Red indicator blinks once
low
Good signal
Red indicator doesn’t blink
low
RTK positioning
Yellow indicator blinks once

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If the aircraft is in the mode, LED will be flashed green twice.
2、Operation description
After searching satellite or RTK positioning, switch CH5 of the remote controller
to the ATT-ALT mode. Arm FCU and push the throttle. If throttle stick under 50%,
motors will be idling. And you can push the throttle stick gently to make the aircraft
take off. If the throttle is placed in 50% position, the aircraft will be in alt-hold
flight .If the aircraft is in motion, all the control sticks of remote controller return to
the middle position, the aircraft will brake and hover automatically.
To find the respective function of the stick, please refer to the following table:
GPS-ANGLE
Channel setting
Description
CH1
Control roll angle
To change the desire roll angle of aircraft
CH2
Control pitch angle
To change the desire pitch angle of aircraft
CH3
Control speed of altitude
When the throttle is in the middle, the
aircraft stays in constant altitude.
CH4
Control the rate of yaw
To change the desire rate of pitch angle
5.1.4 GPS-SPEED
GPS-speed mode is the strictest flight mode to control the flight speed of aircraft,
It can meet with the demands of the speed-sensitive users. In the mode, Besides IMU
and Barometer, compass and GPS also involve in flight control.
1、Working condition
The working condition is as same as GPS-angle mode.
2、Operation description
The description of control stick is different from GPS–ANGLE mode, other
operations are as the same as GPS-angle mode.
To find the respective function of the stick, please refer to the following table:
GPS-ANGLE
Channel setting
Description
CH1
Control the rate of
roll angle
Different from GPS-angle mode, the stick
couldn’t control the roll angle of the
aircraft any more, but strictly controls the
flight speed of the aircraft in roll direction.

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CH2
Control the pitch of
roll angle
Different from GPS-angle mode, the stick
couldn’t control the pitch angle of the
aircraft any more, but strictly controls the
flight speed of the aircraft in pitch
direction.
CH3
Control speed of altitude
When the throttle is in the middle, the
aircraft stays in constant altitude.
CH4
Control the rate of yaw
To change the desire rate of pitch angle
5.1.5 AB-MODE
1、Setting
Before using the mode, you need connect to the Assistant2 Software for some
channel setting.
Settings of AB record: connect to Assistant2 Software and enter the path of
“Adv”—“Plant”. Read AB operation process.
Gear 1: close
Gear 2: record A
Gear 3: record B
AB record
channel value
p<=1200
1400<=p<=1600
p>=1800

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2、Operation description
Step 1: Record A waypoint:
Hovering in GPS mode, switch the control stick of AB record to Gear 2. If
recording has finished, LED will flash yellow light for 2 seconds.
Step 2: Record B waypoint:
Making the aircraft to fly to the wanted place and hovering the aircraft .Switch
the control stick of AB record to Gear 3. If recording has finished, LED will flash
green light for 2 seconds.
Step 3: AB execution
Switch the control stick of AB mode execution.
Step 4: Select direction
Push the CH1 to select the direction. If you push CH1 to the left, it will move to
the left. If you push CH1 to the right, it will move to the right. Most important is that
it has to clean AB waypoints which recorded last time before you execute those steps.
Otherwise it will execute the AB points of operation settings which recorded last time.
Step 5: Interrupt AB operation
AB operation can be interrupted by the following ways: shift CH5 bar to an other
flight mode, switch control stick of AB operation to Gear 1, or switch to the
return-to-home.
During the execution, LED flash green light for four times.
During the execution, the CH3 and CH4 of remote controller can be used to
control the altitude and flight direction.
3、Correction function
AB points distance correction :
push pitch bar upwards or downwards, it can lengthened or shortened the AB
waypoint length.

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4、Parameters setting
Supporting the configurations of the banner and speed in AB operation by both
Assistant2 Software and APP.
Assistant Software setting:connect to Assistant2 Software and enter the path of
“Adv”—“Plant”. Read AB operation process.
APP setting: use data-link to connect the FCU. Please refer to the port definitions
table.
5、Others
Clear AB waypoints: shift the control stick of AB records quickly for 4 to 5 times,
then LED will flash red, green and yellow rapidly and alternately. This meas AB
points has been clearly deleted. If you forget clear AB waypoints whitch recorded last
time, you will not be able to record new AB waypoints.
5.1.6 Auto-return-to-home mode
Auto-return-to-home mode provides the safety guarantee for long-distance flight
and FS protection.
1、Working condition
The working condition is as same as GPS-angle mode. FCU will record the
current position as the return-to-home waypoint when everytime users unclock the
aircraft. If the aircraft is in the mode, LED will be flashed green quickly.
2、Operation description
The automatic return-to-home mode can be triggered by control stick, also can be
triggered through lost control protection. When CH6 switch to one-key
return-to-home position or the FCU is in FS protection status, the aircraft will
automatically lift to a set altitude if the distance between the aircraft and the return
waypoint is more than 2m(if the current altitude is higher than the setting
return-to-home altitude, it takes the current altitude for return-to-home). During
return-to-home the aircraft won’t be interfered manually by the control stick channel.
After the aircraft arrives at the return-to-home waypoint, firstly it will hover for about
3 seconds, and then slowly land, at this time you can control the flight status of the
aircraft (but no response to throttle stick) by the ch1 ch2 ch4 channels, which making
the aircraft to seek a more suitable landing place. Until the aircraft landing completes,
the aircraft will lock automatically. If the distance between the aircraft and
return-to-homewaypoint is less than 2m, the aircraft will land and lock automatically.

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Attentions
1. The premise of automatic return-to-home is that the aircraft return-to-home
waypoint has been recorded. If you need to use automatic return-to-home, please arm
it after searching satellite . You can refer to the appendix about LED tricolored light
indication and meaning.
2. When the aircraft is near people, we suggestted not to switch into the automatic
return-to-home mode in case of accident.
5.2 Advanced functions
5.2.1Cut-out and continue spraying
If you interrupt AB operation and change battery, it will continue to execute the
latest AB operation after switching the control stick to AB mode.
Please read the ASSISTANT2 description before use this functions.
5.2.2One-key sidesway
1 Parameters setting
Supporting the configurations of the banner in sidesway by both Assistant2
Software and APP.
Assistant Software setting:connect to Assistant2 Software and enter the path of
“Adv”—“Plant”. Read AB operation process.
APP setting: use data-link to connect the FCU. Please refer to the port definitions
table.

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3、Operation：switch to “Close”–“Move to the left”–“Close”, and it will execute a
left side-move once; switch to “Close”—“Move to the right”–“Close”, and it will
execute a right side-move once.
5.2.3Pump control function
The function is to control flow of the pump.It supports two kinds of control
modes: one is manual control mode which means output of pump is controlled by the
remote controller directly. the other is linkage mode which means when the pump is
switched on, the flow speed of the water pump is corresponding to the horizontal
flight speed of the aircraft. In other words, the higher flight speed and the larger flow.
1、Connection : connect the ESC signal wire of the water pump to the PUMP port on
the FCU.
2、Setting: connect to Assistant2 Software, configure the channel to control the water
pump.
Supporting the configurations of the PUMP by both Assistant2 Software and
APP.
Assistant Software setting:connect to Assistant2 Software and enter the path of
“Adv”—“Pump”.
APP setting: use data-link to connect the FCU. Please refer to the port definitions
table.