9 Feb.2012 forum RCGroups


last updated 9 Feb.201

The system has been tested for 2 years and now ready to be used by anyone wanting instant response from their RC model plane, latency is just 4ms which is few times better than offere by leading RC manufacturers such as Futaba and Hi-Tec

Fast responding radio-link helps to avoid crashes and makes possible controlling small unstable planes such as flying wings.

For ergonomics and performance was chosen Wii Nunchuck, it is polled 270Hz and sends encoded packets at user defined frequency anywhere in 240-930MHz frequency hopping step is 2MHz, the system meant to work with repeaters - now one can fly far away without powerfull boosters transmitting just 50 mW !.
U-Link sends telemetry at rate 4Hz and integrates gyro stabilization. All electronics without the servos and motor weighs just 22gram!
It is easy to locate downed plane with built-in digital and analog beacons using telemetry and walkie-talkie to hear fading tones and watching RSSI.
Flight controller also includes a programmable pan / tilt camera 3 preset positions and automatic scanner. Also one can ignite fireworks using onboard 5A nichrome igniter or strobe powerful LEDs.

nunchack stick has the same function as conventional joystick control - aileron / elevator
throttle and rudder controlled with accelerometers While controlling throttle by tilting the nunchuck feels natural, rudder control is less comfortable - it takes time to get used to tilt hand left and right while keeping trottle steady. Fortunately sometimes rudder control not needed at all (flying wings).

The nunchuck has trainer port to connect normal controllers,then nunchuck is master - it takes all control while stick moved off-center.

normal controllers without pushbuttons have somewhat limited functionlity. Nunchuck "Z" and "C" buttons are heavily used while flying and for setup.

pilot using nunchuck for the 1st time must remember:

If there are problems with control or crash happened just click the big button "Z" (one short click), the command turns off the motor and blocks the accelerometer - the remote won't respond if tilted so you safe to put it aside..
Before starting motor tilt hand down (throttle = 0) then double click "Z" >> start tilting up thus increasing RPM

To lock Throttle and Rudder hold "C" for about a second, release the button. Now you can relax -keep hand.hanging
Short press the button "C" (or series of clicks) to activate accelerometers.

"C" button:
1 short click is used to activate accelerometers (unless Z not in 1 position), also sets camera pan / tilt to 1st stored position

also single short click used to calibrate gyros if button pushed while throttle is blocked(1 Z) AND elevator pulled full up.

2 clicks: 2nd preset camera pan /tilt (usually the camera turns to the left and down), number 2 when entering commands,
3 clicks: 3rd preset camera pan /tilt (usually the camera turns to the right), number 3 in the serial input commands
4 clicks: = automatic panning / tilting, the camera slowly goes through the presets

push "C" 1s long to switch stick function , you can slowly adjust pan/tilt, click shortly to switch stick back to aileron/elevator
if Z pushed while C is also pushed and used to set pan/tilt current preset will be updated..

Special commands can be 2,3 or even 6-digit long (TX frequency set), for example to ignite fireworks enter 4.2 , you can have long pause in between series of clicks, say pushed C 4 times then 10 seconds later push 2 to fire or 1 to abort.

Setup codes start with 6 C clicks, shortly after you'll hear special tone confirming setup mode, after 4 seconds of inactivity setup will time-out
C: 6:1. X x = sub_channel
C: 6:3.1 calibrate stick and accelerometers, hold nunchuck in neutral position (50% trottle and rudder)
starting transmitted frequency set, enter 6 digits, example 6: TX frequency= 423.563MHz

The receiver has a single button, as opposed to the transmitter to enter codes directly without leading 6:

single click to calibrate gyro (usually not used)
2 clicks reverse both servos on a flying wing
3 clicks reverse pan servo
4. reverse tilt servo

1.1 The first sub_channel, 1.2 second and so on.

2.1 classic aircraft
2.2 flying wing
2.3 two-motor flying wing (Rudder =motors diff.)
2.4 Tricopter(not tested yet)

instal flight-controller as convinient then check gyro reverses:

3.1 Reverse aileron gyro
3.2 Reverse elevator gyro
3.3 Reverse rudder gyro
3.4 swap x/y axis (aileron / elevator gyro swap)

LED confirms all codes entered

if throttle was turned on (2 Z) setup button gets disconnected, need to reboot if setup needed

The receiver weighs 22gram including 3A UBEC, Wii MP board and 20A current sensor, there is no SMA- use simple wire antenna.


pan/tilt action:


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