INTRODUCTION

FY-901 has integrated three-axis gyro and three-axis accelerometer, which controls the aircraft movement in three-dimensional space. FY-901 can be used in multi-rotor copter.

Aircraft Apply
The FY-901 for multi-rotor copter can be used in the following models:

-Quadcopter X-Type

-Quadcopter cross-Type

-Y3-copter

-Any other configuration apply need, please e-mail us: service@feiyu-tech.com.

RC Radio suitability:

The FY-901 has been tested to work well with the following RC system:

- Robbe-Futaba PPM / PCM 1024 / PCM G3 mode, 2.4G systems

- Graupner / JR PPM 8, PPM 12, SPCM mode;

- MPX PPM8, PPM 12 with UNI mode

- any other system with a neutral position of 1.5 ms (standard in most RC Radios).

The FY-901 Operating Mode for multi-rotor copter supports two flight modes :

v Mode 1: Auto-Stabilization mode. In this mode, the FY-901 will automatically command the control surface of the aircraft to maintain level flight all the time(sticks in the middle position). The sticks correspond the roll and pitch attitude angle.The netual position of sticks is 0 degree and the maximum angle is 55 degrees.

v Mode 2: 3D Control Mode. In this mode, the balancer utilizes its 3-axis gyroscope to sense roll velocity and flight attitude. If no input is given by the pilot (sticks in the middle position) the FY-901 will lock the current aircraft attitude. This prevents from rolling of the aircraft at the axial plane and maintains its current posture. Therefore, the aircraft can be easily maneuvered to complete a variety of 3D movements with added stability and smoothness.

Switch Setting for FY-901 Flight Modes

To activate the different flight modes, use a free Receiver channel (e.g. Channel 5) to output the appropriate signal to FY-901.

Use a 2 way-switch from your RC radio

Flight Modes	MODE 1	MODE 2
Receiver signal output	900-1800uS	1800-2100uS
FY-901 Function	Auto Stabilization mode	3D Mode

b) If you do not connect the Switch channel with your RC Receiver or FY-901 does not detect any incoming signal through this input channel, it will automatically engage Mode 1- Auto Stabilization Mode. However, we do not suggest flying the unit with no signal input to the Switch Channel.

c ) Please note that even though there are Throttle Input and Throttle Output from the FY-901, the system does not control the Throttle to hold the altitude, you must always control the Throttle to keep flying altitude.

Blue LED

Blue LED	Continuousflashing	On Solid
Flight Mode Status	Auto Stabilization	3D Mode

Red LED

RedLED	OFF	Aircraft is stationary but Red LED Flashes	ON Solid
Status Indicator	Normal	Need toinitialize thegyro/ moving	High Vibration Detected. Does notmeet system requirement.

Gyroscope initialization (re-setting):

Out of the box, the FY-901 has been fully initialized. However, if the following condition occurs, resetting the gyro is recommended:

1. The device is kept unused for a long time.
2. There is a change in environmental temperature of over 30 degrees.
3. The red LED light flashes even when the aircraft is stationary

Initialization / Reset Procedure

Power-ON the FY-901 and keep it stationary for at least 20 seconds. You will notice the red light blinks at two different rates (or turns off). Re-setting of Gyro is completed. Disconnect power, unplug the jumper and keep it in a safe place for future use).

NOTE:

• Carry out this re-setting procedure only if the condition (above) occurs. It is not recommended to regularly reset the gyro. It is not necessary.
• The stabilizer unit does not need to be in a horizontal position during initialization. However, you must ensure there is no vibration during this process. If you suspect shaking has occurred, just restart the resetting process.

FY-901 power supply

• FY-901 working voltage =5 to 6V.
• The FY-901 requires stable power input. Therefore, we highly recommend using an external BEC power supply with minimum 3A output. The higher the better.
• Be sure to remove the Red wire from your ESC plug if using an external BEC.
• BEC should be plugged into your RC Receiver. Power is sent to the FY-901 via Channel 1 input.
• FY-901 colour coded cable to RC Recei

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