RX and IMU Calibration on Startup
after powering up, the device will try to calibrate the RX input and IMU sensor simultaneously.
during RX calibration, keep the AIL/ELE/RUD sticks in the neutral (centered) position. for flapperons, it does
not matter if they are in the UP or DOWN position. once the device has detected that the sticks have been still
for a period, it will record those readings as the neutral stick positions.
during IMU calibration, keep the plane still on the ground.
it does not have to be wings level, just have to
be still
. once the device has detected that the IMU readings are stable, it will record those readings as the
“zero” rotation rate values.
the LED will flash accordingly if the RX or IMU (or both) calibration is still in progress.
Stabilization will engage once both RX and IMU calibrations complete. You can tell it is the case by any one
of the following:
waiting for the control surfaces to wiggle back and forth 3 times
looking at the LEDs (should not see calibration status)
rocking the plane to see if there is correction (with proper gain setting)
If there is a power cycle in the air, the device will undergo calibration again. But it is unlikely for the plane or
the TX to be still enough for calibration complete in the air successfully. However, the RX signals still pass
through to the servos, allowing you to control and land the airplane, but without any stabilization.
Mixer EPA Mode
there are 3 mixer EPA modes that controls the limits of all the servos.
with
tracking
mode, the servos will never be driven past the point that the RX would drive if there was no
stabilization correction. this would prevent servo binding. however, this means that you should “cycle” the
sticks to the limits on the ground each time before flying for the device to learn the limits from the RX.
otherwise, it would apply a smaller correction than it could based only what it learnt from the RX.
the mixer EPA mode can be set from stick configuration.
CPPM Mode
The device supports CPPM mode for reduced connections to the RX and to enable more channels (AUX2,
THROTTLE and FLAP) on the RX3S V1 and V2 devices. The RX3S V3 device has an integrated RX, which
cannot be set to CPPM mode.
Refer to the connection diagram for CPPM connection. note that the THROTTLE and FLAP channels are
passed through and available through two pins since the RX is unlikely to output CPPM and individual
channels at the same time.
currently, only the “RETA1a2F” CPPM channel order is supported.
Attitude Hold
Attitude HOLD allows the plane to fly with a fixed attitude (as long as there is sufficient power and control
surface authority).
The AUX1 channel determines if the plane is in RATE (stabilization only) mode or HOLD mode.
When attitude hold is enabled, the device will
engage
, or hold the attitude, whenever the sticks are near their
neutral position. Attitude hold will
disengage
when the stick moves away from the neutral position.
Pitch and roll are separately controlled from yaw. For example, the device can hold a high alpha attitude (with
pitch and roll) while you use the rudder to steer the aircraft. For another example, the device can hold a knife
edge (with yaw) while you use the aileron and elevator stick to steer the aircraft.
Attitude hold is short term as the gyros drift after a brief period. When you move the sticks to correct for the
drift, the device will disengage the hold and then re-engage when you return the sticks to the neutral position.
Side Mounting
The device supports mounting to the side of a flat fuselage foamy. Assuming you start from a normal flat
5 SHORT
device init error (gyro)
20 VERY SHORT
low SRAM
50 VERY SHORT
EEPROM has reset, power cycle device now
Mixer EPA mode
Notes
FULL (default)
1000-2000 us
NORMAL
1100-1900 us
TRACKING
start with 1250-1750us, then track and never exceed the RX
Page 11 of 16
FlightStab Guide
10/07/2013
https://docs.google.com/document/d/1Wu7kNyU2rjOpttHuphGEAHgbkrqj7dtaAC7H...
