FAMTECH MG25 User manual

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MANUAL
MG25

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CN SHANGHAI FAMTECHS CO., LTD.
MG25 is a flight controller especially designed for small size quadcopters, it’s compact,
easy to use and quite stable on flying.
● Compact size, lightweight design, especially suitable for 250 size quadcopter which has
limited space and weight.
● 32-bit ARM processor, powerful computing capability.
● High-precision MEMS sensor embedded 3-axis gyroscope and 3-axis accelerometer.
● Supports SBUS receiver, simplify wiring.
● Advanced attitude and control algorithms, excellent performance.
● Supports auto level, manual modes, made it suitable for both beginners and advanced pilots.
● Uses a separate input channel to select flight modes.
● Easy to use, users can simply set and fly.
● PC client software provides a rich set of parameters for high-end users.
● Supports FC53 programming card, makes setting on field more convenient.
1.Introduction
2.Features
3.Technical parameters
4.Package contents
MG25 flight controller × 1
Single signal cable × 2
3 signal cable × 1
USB link module × 1
Double sided adhesive tape × 1
Need an at least 4 channel transmitter, if the transmitter only have 4 channels, MG25 will
works on auto level mode. 5 or more channel transmitter is recommended, so that different
flight modes can be switched by the 5th channel
5.Remote control requirement
Dimensions: 32mm × 23mm × 15mm
Weight: 7g (excluding cables)
Working temperature: -30 ~ 60 degree Celsius
Input voltage: DC 4.2V ~ 7.4V
Maximum current consumption: 105mA

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CN SHANGHAI FAMTECHS CO., LTD.
AG22 supports 4.2v ~ 7.4v voltage power supply, sharing power with the receiver, you
can choose single ESC BEC or external BEC as a power source.
*
6.Power supply
● MG25 should be mounted as shown in the figure below, head point forward.
Please note the sequence of motors and rotating direction of propellers, please stick
MG25 to your quadcopter with double side tape accessory.
7.Installation
*
X type +type
Head direction
Motor1Motor4
Motor2Motor3
Head direction
Motor1
Motor4
Motor2
Motor3
-
M3 Ele Aux
Thr
M2 M1
Rud
Ail
(BUS)
+ + + + +
- - - - -
+
M4
outputs inputs
MG25 inputs and outputs are listed as follows (back side view).

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CN SHANGHAI FAMTECHS CO., LTD.
● Connection of MG25 with regular PWM receiver is shown below.
● Connection of MG25 with SBUS receiver is shown below.
1 AIL
2 ELE
3 THR
4 RUD
5 CH5
6 AIL2
brown
red
orange
Receiver
Normal receiver
SBUS
Receiver
SBUS supported receiver

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CN SHANGHAI FAMTECHS CO., LTD.
8.First time setup
● Basic setting
Please select appropriate‘Frame type’, ‘Receiver type’and‘Idle speed’via PC
software according to your quadcopter and transmitter.
● Transmitter setting
Please set the model type to general airplane on your transmitter.
Please connect MG25 AUX to the 5th channel of your transmitter, and use a
double-stage switch to sleect different flight modes, the corresponding flight modes to
switch position are shown in the table below
● Power on instruction
Please strictly follow the instructions below to power on the MG25.
Note: When using SBUS receiver, transmitter channels must be distributed
as shown in the table below.
!
Channel
Function
CH1
Aileron
CH2
Elevator
CH3
Throttle
CH4
Rudder
CH5
Gear
Power on the
remote
controller
Power on the
quad-rotor
Put the quad-rotor on the ground
(without completely horizontal),
do not take in your hand
Green LED flashing (in this case,
please keep the four-rotor still does
not want to move any joystick)
Green LED finished flashing, red
light, the end of the flight control
initialization is locked, you can
unlock and start flying
Switch postion
Signal width
Flying mode
low
900-1300us
manual
high
1300-2100us
Auto level

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CN SHANGHAI FAMTECHS CO., LTD.
● Arming and disarming
After power on the copter correctly, execute the arming gesture (move the sticks and
hold for 1 second as shown in figure below), the copter will be armed (green light on), all
motors will begin to spin slowly, you can raise the throttle to take off; if throttle keeps down
over 3 seconds, the copter will disarm again (red light on, all motors stop).
Note: If you execute arming gesture when MG25 is armed, MG25 will disarm
again immediately.
!
● MG25 stick range calibration & ESC calibration
Stick range calibration makes control of MG25 more precise, MG25 provides a simple
way to calibrate stick range: Turn on the transmitter, put the throttle stick at maximum
position, and then connect the battery, both red and green LED on MG25 will on, that
means MG25 has entered stick range calibration mode. After that, pull the throttle stick
down to its minimum position until all LEDs are off, stick range calibration is finished.
Note:
1.All channels must be set to a same travel.
2.During this process, all MG25 outputs are same as your throttle, so you can connect all
ESCs to MG25 outputs so that ESC throttle calibration can be done at the same time.
9.Settings
MG25 can be connected to PC via USB link module, connect these as shown in figure
below.
USB link
micro
USB USB
To PC

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CN SHANGHAI FAMTECHS CO., LTD.
Parameter explanation：
● Frame type：Choose frame type of your quadcopter
1.Quad-X：X type quadcopter
2.Quad-cross：Cross type quadcopter
● Receiver type：Choose receiver type
1.PWM receiver：PWM receiver
2.SBUS receiver：SBUS receiver
● Idle speed：Defines the motor speed when copter is armed.
1.Off：Motor not moved
2.Low：Motor keep low speed
3.Normal：Motor keep medium speed
4.High ：Motor keep high speed
● Basic gain: Most crucial parameters, direct affect flying performance. Usually, larger
copter needs larger basic gains. The default settings are optimized for 250 size
quadcopters.
● Angular rate limit: These parameters decide maximum rotating speed your copter can
reach on manual mode. The higher these parameters are set, the more manoeuvrable you
copter will be. If you want do flips and rolls, it’s better to set over 300.
● Angle limit: Maximum angle of each axis of your copter can achieve on auto level
mode, you can increase these if you want fast fly on auto level mode.
● Attitude gain: You can get quick response of the copter to your controls if you increase
PC setup software interface is shown below:
Please install the ‘USB to serial’ driver first. After MG25 powered on and initialization
finished, select right COM port, and click Connect MG25 button to link MG25, when
parameters are modified, click Apply setting button to save settings.
these parameters.
● Angle trim: These parameters are used to compensate angle bias on auto level flying
(usually caused by inaccuracy of the mounting surface). During auto level flying, if you
put aileron stick on its neutral but the copter still drift left, you can increase roll angle
trim to eliminate this, otherwise the opposite; if you put elevator stick on its neutral but
the copter still drift backward, you can increase pitch angle trim to eliminate this,
otherwise the opposite
MG25 can also be connected with FC53 programming card for field setting. Please
refer FC53 instruction manual for more details.

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CN SHANGHAI FAMTECHS CO., LTD.
Parameter explanation：
● Frame type：Choose frame type of your quadcopter
1.Quad-X：X type quadcopter
2.Quad-cross：Cross type quadcopter
● Receiver type：Choose receiver type
1.PWM receiver：PWM receiver
2.SBUS receiver：SBUS receiver
● Idle speed：Defines the motor speed when copter is armed.
1.Off：Motor not moved
2.Low：Motor keep low speed
3.Normal：Motor keep medium speed
4.High ：Motor keep high speed
● Basic gain: Most crucial parameters, direct affect flying performance. Usually, larger
copter needs larger basic gains. The default settings are optimized for 250 size
quadcopters.
● Angular rate limit: These parameters decide maximum rotating speed your copter can
reach on manual mode. The higher these parameters are set, the more manoeuvrable you
copter will be. If you want do flips and rolls, it’s better to set over 300.
● Angle limit: Maximum angle of each axis of your copter can achieve on auto level
mode, you can increase these if you want fast fly on auto level mode.
● Attitude gain: You can get quick response of the copter to your controls if you increase FAMTECH All Rights Reserved
FC53
SYSTEM MENU
BATTERY MONITOR
PWM TEST
SERVO TEST
SELECT FUNCTION
PROGRAM CARD
10. LED status
LED status indicates the state of MG25, please refer the table below.
LED status
Green light flashing
Green light flashed over,
Red light on
Green light on
Both red and green light on
Red light flashing
MG25 status
Initializing
MG25 disarmed
MG25 armed, ready to fly
In stick range calibration procedure
MG25 error
Actions
Do not move copter or sticks
Take off and fly
calibrating
Reboot MG25
these parameters.
● Angle trim: These parameters are used to compensate angle bias on auto level flying
(usually caused by inaccuracy of the mounting surface). During auto level flying, if you
put aileron stick on its neutral but the copter still drift left, you can increase roll angle
trim to eliminate this, otherwise the opposite; if you put elevator stick on its neutral but
the copter still drift backward, you can increase pitch angle trim to eliminate this,
otherwise the opposite
MG25 can also be connected with FC53 programming card for field setting. Please
refer FC53 instruction manual for more details.
Execute the arming gesture,
if still can’t arm, please
check receiver inputs

Shanghai Famtechs Co., Ltd.
Add: Rm.575,No.31, Shaochang Rd,Fengxian district ,Shanghai,China
P.C: 201413
Mail:[email protected]
Web: www.fam-techs.com