Lemon Microbrick Reference Guide
Page 14 of 20
A rudder servo can be plugged into the outer JST connector, which is normally aileron, and can be operated by
channel 4 (Rudder). The other JST connector (ch6) just follows the onboard Rudder servo.
Aileron Stick > Rudder (Rudder Steering)
Referred to as “Legacy Mode” in the Lemon web page instructions, this mix moves the rudder servo to the
aileron stick (channel2). In the receiver, the
“E” and “R”
blue LEDs are ON during setup thus indicating A->R on-
board mixing.
This mix is helpful for a three-channel model: Throttle, Rudder, Elevator only. The Roll stick controls rudder while
the Pitch and Throttle are unchanged. If choosing this mix, do
NOT
use the outer white JST connector for a servo.
That connector (and the other as well if Dual Aileron is selected in the transmitter) will simply follow the rudder.
Enabling Dual Aileron Stabilization
Holding the button for
just over 18 seconds
causes the
two furthest apart blue LEDs (“A” and “
R
”) to flash.
Quickly release the button.
LED
A E
R Mixer function
◉
◉
These two will be flashing
The display will change. If only the center LED
“E”
is flashing, then the Microbrick is in single aileron mode. If the
center LED is flashing and the outer two
“A and R”
are solid, then the Microbrick is in dual aileron mode.
You have less than 5 seconds to change aileron mode. Press briefly to swap between dual aileron and single
aileron. After changing mode, wait 5 seconds or so for the Microbrick to return to normal operation.
1.
If single aileron is set, then the Microbrick actively stabilizes only on channel 2. Channel 6 can be used for an
independent function like flaps or gear. Normally a Y-lead or a single servo would be used for ailerons and
Normal must be set as the wing type in Spektrum transmitters.
2.
If dual aileron is set, then the Microbrick actively stabilizes on both channels 2 and 6. Dual Ail (or Flaperon)
must be set as the wing/aircraft type in Spektrum transmitters. Normally separate aileron servos would be
plugged into the two white JST connectors.
Note that if you have single aileron setup on the Microbrick but set Dual Ail on the transmitter, with servos
plugged into both white JST connectors, then both ailerons will work but you will only get active stabilization on
the servo on channel 2.
General Hint:
If you think you have done everything right, but the Microbrick does not seem to be responding
correctly after a configuration session, try turning the Microbrick and transmitter off, then on again. It is a small
computer after all, and this has been known to work.
Mixing Considerations
The previous instructions should give you the information you need to set up V-Tail, elevon, dual aileron and
flaperon mixing with the Lemon Microbrick. The purpose of this section is to explain further how all this works.
The key point to understand is that the stabilizer only recognizes and corrects for movement in the three
standard flight axes.
Consequently, the stabilizer expects the transmitter to provide the conventional “pure”
inputs: roll (aileron), pitch (elevator) and yaw (rudder). Any processing (mixing) needed to turn these inputs into
servo commands for a non-standard control arrangement such as elevon or V-tail has to take place in the
stabilizer itself, NOT in the transmitter. By contrast, flaperon mixing takes place in the transmitter.
What is Mixing?
In a simple control setup, each axis has a dedicated control surface (or pair of surfaces in the case of aileron).
Each axis is controlled by a separate channel passed from the transmitter through the receiver (and its
