HOBBYEAGLE A3 Evo Stabilizer Flight Controller User Manual
- June 6, 2024
- HOBBYEAGLE
Table of Contents
- INSTALLATION
- CONNECTION
- FLIGHT MODES
- GAIN ADJUSTMENT
- SETTING METHOD
- Setup Menu
- Function Selection
- Option Switching
- Exit of Menu
- Setup Menu Table (* is the default setting)
- Gyro Direction
- Wing Type
- Servo Connection Illustration
- Receiver Type
- Mount Orientation
- Flight Mode Allocation
- Servo Frequency
- Level Calibration
- Hover Calibration
- Remote Master Gain
- * Factory Reset
- * Accelerometer Calibration
- LED DESCRIPTIONS
- SPECIFICATIONS
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
HOBBYEAGLE A3 Evo Stabilizer Flight Controller
Thank you for purchasing our products. A3 EVO is a high-performance and functional 6-axis gyro system designed for R/C airplanes. In order for you to make the best use of your gyro and to fly safely, please read this instruction manual carefully and set up the device as described below.
IMPORTANT NOTES
- Radio controlled (R/C) models are not toys! The propellers rotate at high speed and pose potential risk. They may cause severe injury due to improper usage. It is necessary to observe common safety rules for R/C models and the local law. Read the following instructions thoroughly before the first use of your gyros and setup the gyro carefully according to this manual. We also recommend that you seek the assistance of an experienced pilot before attempting to fly with our gyros for the first time.
- After power on, A3 EVO needs to perform an accurate gyroscope calibration, keep the airplane stationary after power on and wait while the LED flashes Blue. The LED will stay solid Blue if a slight movement is detected and the calibration will not start until you stop moving the airplane, however, making the airplane level is NOT required during the initialization.
- A stick centering is also required following the gyroscope calibration. Always put all the sticks center (the throttle stick in the lowest position) before power on the airplane, and do not move the sticks until the initialization is done.
- Make sure to check the gyro direction of Aileron, Elevator and Rudder channels after installation and always perform a test of them before each flight. An opposite reaction of the gyro could lead to losing control or even crash!
- It is recommended to use the supplied 3300uF/16V capacitor to get a more stable and secure working voltage for the gyro. The capacitor can be plugged onto any one of the free connectors of the gyro or receiver.
INSTALLATION
Use one of the supplied double-sided tape to attach the gyro to your airplane
firmly. For best performance, the gyro should be mounted as close to the C.G.
as possible, and the housing edges must be aligned exactly parallel to all
three rotation axes of the plane. The gyro can be attached flat or upright,
and even upside down, however, you have to ensure that the shorter side with
the setting button always points toward the heading direction of the airplane,
otherwise the gyro will not work normally in LEVEL and HOVER modes.
NOTES
- Never use the hot-melt glue or nylon ties to fix the gyro onto the airplane!
- You need only one piece of the tapes each time, a soft or thick mounting may probably impact the performance of the gyro.
- The gyro is a sensing device, please make enough space around it and keep as far away from other electronic devices or wires as possible.
CONNECTION
NOTES
- [MODE] is used for flight mode switching of the gyro, connect it to a 3-way switch channel of the receiver to switch the flight mode in flight.
- [SBUS/PPM/G] is used for remote master gain adjusting, connect it to a proportional channel of a volume or slide lever of the transmitter to tune the master gain in flight.
- The ESC or throttle servo is connected to the throttle channel of the receiver directly without passing through the gyro.
- Pay attention to the polarity of the plugs. The orange signal line must always be on the top and the brown on the bottom.
Single-line Receiver Connection
A3 EVO supports PPM and Futaba S.Bus serial receivers which allows you to connect the gyro to the receiver with one single wire. When using a specific type of these receivers the appropriate type of receiver channel allocation will radio transmits the channels in the correct order. If you use a standard PWM receiver with standard wiring layout the channel mapping does not apply. When A3 EVO is operating in single line receiver mode, the [THR Out/AIL] can be used as the throttle output channel for the ESC or the throttle servo if a mini receiver is being used which has no additional output connectors.
**** Please note that the Remote Master Gain is disabled in single line mode as default. Choose a channel number for gain channel in item 11 of the Setup Menu to activate this feature if needed.
Table 1: Default Channel Mapping f or Single Line Receivers
Serial Receiver Protocol| AIL| ELE| THR| RUD| MODE|
GAIN
---|---|---|---|---|---|---
PPM Receiver| CH1| CH2| CH3| CH4| CH5| –
Futaba S.Bus (FrSky SBUS or WFLY WBUS)
| CH1| CH2| CH3| CH4| CH5|
–
FLIGHT MODES
A3 EVO provides 4 flight modes which can be switched by a 3-position switch of the transmitter during flight. We have provided you with 4 different mode allocation corresponding to the 3 positions of the switch in Item 7 of the Setting Menu, the default setting is MODE 1: NORMAL LEVEL – HOVER. The color of the LED shows the current flight mode of the gyro while in use.
Table 2: Colors of the LED for Flight Modes
Table 3: Flight Mode Allocations
Mode | Position-1 | Position-2 | Position-3 |
---|---|---|---|
MODE-1 ***** | NORMAL | LEVEL | HOVER |
MODE-2 | NORMAL | GYRO OFF | LEVEL |
MODE-3 | NORMAL | GYRO OFF | HOVER |
MODE-4 | LEVEL | GYRO OFF | HOVER |
GYRO OFF Mode
When operating in GYRO OFF mode the gyro will be deactivated completely, and the airplane will be completely under the control of your transmitter as it was before installing the gyro. This mode is usually used for testing purpose only.
NORMAL Mode
The NORMAL mode, also known as the `Rate mode’, is the most basic function of the gyro. It works based on the rotation rate control of each axis of the airplane. When operating in this mode, the gyro will only correct currently occurring rotational movements, a momentary reaction will be applied to the servos when the airplane rotating on corresponding axis, after rotation the servos will move back to their neutral position as soon as the airplane standing still immediately. The NORMAL mode can be used with nearly any size and type of airplanes. It can effectively improve the stability and precision of the airplane and reduce the stall point specially.
LEVEL Mode
The LEVEL mode is also known as the Auto-Level mode’,
Auto-Balance mode’ or
`Horizon mode’. When operating in this mode, the airplane will be brought to
horizontal position automatically when releasing the sticks. Different from
the ANGLE mode, there is no maximum angle limitation in this mode and the
airplane will be stabilized only when there is no specific control input from
aileron and elevator sticks. This mode can be used if the pilot becomes
disoriented and would like to save the airplane from crashing.
HOVER Mode
mode. The only difference is that when you release the sticks, the airplane will be brought to vertical position (nose up) and keeps hovering. This mode is designed to help you to learn hovering maneuver and reduce the probability of crashing.
GAIN ADJUSTMENT
Basic Gain
There are 3 trimming potentiometers on the front of the A3 EVO. They are used to adjust the basic gain of the gyro for Aileron, Elevator and Rudder separately. Clockwise for increase, anticlockwise for decrease. Basic gain determines the momentary reaction strength of the gyro. In general, the higher the gain the harder the airplane will stop after rotation and the more stable and precise the airplane will fly. But if the gain is too high the airplane will tend to oscillate at high frequency on the corresponding axis. If too small, the operation and stability will not be so good and the airplane does not stop precisely and overshoots. The gyro will be deactivated completely if you turn the basic gain to 0%.
For the first flight test it is recommended to start with a lower basic gain setting (e.g. 30%) and switch the gyro to NORMAL mode. In case the airplane starts to oscillate in flight then reduce the gain of the corresponding axis. If the control feels weak and imprecise and does not hold position when stopping then increase the gain, according to this approach, fine tune the basic gain until you get the best performance.
Remote Master Gain
The [SBUS/PPM/G] is used to control the remote master gain for parallel PWM receiver. You can make a linear adjustment by using a volume or slide lever on your transmitter or make a 3-level gain selection using a 3-position switch. This function is optional, the master gain will always default to 100% if you do not connect it. Master gain will not affect the basic gain setting on the gyro.
SETTING METHOD
Setup Menu
To get into the Setup Menu, press and hold the button for about 2 seconds until the LED starts flashing Blue and Red quickly. The Setup Menu contains 11 setting functions which normally only need to be setup once after installation.
Function Selection
In the Setup Menu, the LED will flash Blue and Red several times every 3 seconds in a loop and the number of times LED flashes shows at which function item you are currently. For example, one Blue and Red flashing means the first setting “Aileron Gyro Direction”, after waiting about 3 seconds, a twice Blue and Red flashing means the second setting “Elevator Gyro Direction”, and so on.
Option Switching
When you reach the function that you wish to operate in, short press the button to get into it. After entering in, the current selected option is indicated by the color of the LED. Each short press of the button advances the option to the next value. After you finish making your selection, just wait for 5 seconds until the LED starts blink quickly which indicates that the modified is saved and then you will be brought back to the Setup Menu level automatically. If you do not want to change anything, just wait for timeout without any operation.
Exit of Menu
To exit the menu just keep the button pressed for 2 seconds again until the LED starts flashing Blue and Red quickly.
Setup Menu Table (* is the default setting)
Gyro Direction
The top 3 items of the Setting Menu is used to reverse the gyro direction for
Aileron, Elevator and Rudder. The color of LED shows you the gyro direction
currently selected, the default setting is Normal (Solid Blue). Each short
press of the button will switch between Normal and Reversed. After you finish
making your selection, just wait for 5 seconds until LED starts blink quickly
which indicates that the modified is saved and then you will be brought back
to the Setup Menu level automatically.
VERY IMPORTANT!
It is extremely important to make sure that the gyro reacts in the correct
direction for each channel before flight. An opposite reaction of the gyro
could lead to losing control or even crash!
Check the gyro direction for Aileron Quickly move the right wing downward around the roll axis, the right aileron surface should flap down and the left flap up as shown below.
Check the gyro direction for Elevator Quickly move the nose of the airplane downward around the pitch axis, the elevator surface should flap up as shown below.
Check the gyro direction for Rudder Quickly move the nose of the airplane
to the left around the yaw axis, the rudder surface should flap right as
shown below.
Wing Type
The 4th item of the Setup Menu is used to setup the wing type. A3 EVO supports standard fixed-wing, flying-wing (delta-wing) and V-tail. The color of LED shows you the wing type currently selected. The default setting is Standard (Solid Blue), each short press of the button will switch to the next type. After you finish making your selection, just wait for 5 seconds until LED starts blink quickly which indicates that the modified is saved and then you will be brought back to the Setup Menu level automatically.
NOTES
- Make sure that there are no mixing functions active on your transmitter. Have a look at the radio’s servo monitor and verify that each stick controls only one output channel.
- If two aileron servos are being used, please connect a Y-extended lead to [OUT1].
- Most flying-wings have no rudder, in this case, [RUD] is unnecessary to connect.
Servo Connection Illustration
Receiver Type
The 5th item of the Setup Menu is used to choose the receiver type. The color
of LED shows you the receiver type currently selected. The default setting is
PWM Receiver (Solid Blue), each short press of the button will switch to the
next value. After you finish making your selection, just wait for 5 seconds
until the LED starts blink quickly which indicates that the modified is saved
and then you will be brought back to the Setup Menu level automatically.
Restart the gyro to make the new receiver type setting take effect!
Mount Orientation
The 6th item of the Setup Menu is used to setup the mounting orientation of the gyro. The color of LED shows you the orientation currently selected. The default setting is Flat, face up (Solid Blue), each short press of the button will switch to the next value. After you finish making your selection, just wait for 5 seconds until LED starts blink quickly which indicates that the modified is saved and then you will be brought back to the Setup Menu level automatically.
The setting here should be the same as the mounting orientation of your unit
installed in the airplane, otherwise the gyro will not work normally.
Flight Mode Allocation
The 7th item of the Setup Menu is used to select the flight mode allocation definition for the 3-position switch. The color of LED shows you the orientation currently selected. The default setting is Mode-1 (Solid Blue), each short press of the button will switch to the next value. After you finish making your selection, just wait for 5 seconds until LED starts blink quickly which indicates that the modified is saved and then you will be brought back to the Setup Menu level automatically.
See “Table 3: Flight Mode Allocations” on page 5 for description of each mode.
Servo Frequency
The 8th Item of the Setup Menu is used to select the working frequency of the servos. The color of LED shows you the frequency currently selected. The default setting is 50Hz (Solid Blue), each short press of the button will switch to the next value. After you finish making your selection, just wait for 5 seconds until LED starts blink quickly which indicates that the modified is saved and then you will be brought back to the Setup Menu level automatically.
Please note that the analog servos can only work with 50Hz. If you do not know
what the maximum update rate that is tolerated by your servos never use more
that 50Hz. The higher the frequency the better it is for the flight
performance of the gyro but you must check the servo specifications before
increasing the setting. Otherwise, the servos may get damaged!
Level Calibration
When flying in LEVEL mode, A3 EVO needs to know the angle of the airplane in both roll and pitch directions, this is achieved by calculating the attitude of its own. A small angle deviation caused by installation can lead to an unexpected behavior when flying in LEVEL mode. For this reason, a level calibration is recommended to offset the error caused by installation and to establish a proper level reference of your airplane after installing the gyro.
Before calibrating, the airplane should be placed on the horizontal ground and make the wing parallel to the ground. Make the airplane slightly nose-up because a certain elevation angle is usually required to maintain level flight for most airplanes. Short press the button when you reach the 9th item of the Setup Menu, then LED will start blink Blue rapidly for several seconds, do not move the airplane and keep its attitude until the calibration is done.
Hover Calibration
As a same reason, a hover calibration is recommended to perform after
installation if you want to fly with HOVER mode. The procedure is quite
similar to that of level calibration. The only difference is that before
calibrating, you need to lift the airplane and make it vertical to the ground
instead of putting it on the ground.
Short press the button when you reach the 10th item of the Setup Menu, then
LED will start blink Blue rapidly for several seconds, do not move the
airplane and keep its attitude until the calibration is done.
Remote Master Gain
The 11th item of the Setup Menu is used to enable or disable the remote master
gain function for SBUS or PPM receiver mode. The master gain is disabled as
default when leaving the factory, you need to choose either channel 6 or
channel 7 as the gain channel to activate this feature if needed.
* Factory Reset
To restore the gyro to factory default settings, press and hold the button while turn on the power of the gyro, release it when LED starts flash Blue and Red. (FYA: the button needs to be hold for more than 4 seconds), after successfully entering the program the LED will remain flashing Blue, press and hold the button again for about 2 seconds until the LED starts flash Blue quickly, release the button to confirm the reset. After a successful reset the gyro will start the initialization automatically.
* Accelerometer Calibration
Before leaving the factory, every unit has been carefully tested and calibrated. Usually, you do not need to perform a calibration of the accelerometer during use. However, in some specific cases, we would suggest you re-calibrate the accelerometer to obtain better performance, these include temperature changes those will probably cause the mechanical characteristics changes of the sensor, or replacement of new sensor, etc. The calibration should be done on a horizontal desktop and the gyro needs to be removed from the airplane.
Entering the Calibration Program
To access the accelerometer calibration program, press and hold the button while turn on the power of the gyro, release it when LED turns Blue and Red.
Calibration Steps
A3 EVO uses a quick approach for accelerometer calibration, there are only 2 steps corresponding to both sides of Z axis of the unit required to be calibrated. Each step will take about 2 seconds. While calibrating, the LED will flash Blue several seconds and then light up solid in Blue. Do not move the gyro until the calibration is done.
① Put the gyro flat and face up on the table and make it parallel to the
desktop. short press the button, do not move the gyro while the LED is
flashing Blue quickly.
② Put the gyro flat and face down on the table and make it parallel to the
desktop, short press the button, do not move the gyro while the LED is
flashing Blue quickly.
③ After you have finished the 2 steps above, the LED will flash Blue and Red
once which indicates that the calibration is complete, after a successful
calibration the gyro will start the initialization automatically
LED DESCRIPTIONS
SPECIFICATIONS
Main Controller: | AVR MCU |
---|---|
Gyro Scale Range | ±2000dps |
PWM Output: | Limit: 970uS to 2070uS, Neutral: 1520uS |
Input Voltage: | 4.8V to 8.4V (H.V. 2S Lithium Battery Supported) |
Operating Temperature: | -10℃ to 50℃ |
Size | 43×27×14mm |
Sensor: | MEMS 6-axis sensor |
Accel Scale Range | ±4g |
Weight | 10g (excluding wires) |
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