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R/C Operation
90 AX500 Motor Controller User’s Manual Version 1.9b. June 1, 2007
Left/Right Tuning Adjustment
When operating in mixed mode with one motor on each side of the robot, it may happen
that one motor is spinning faster than the other one at identically applied power, causing
the vehicle to pull to the left or to the right.
To compensate for this, the AX500 can be made to give one side up to 10% more power
than the other at the same settings. This capability is described in detail in “Left / Right
Tuning Adjustment” on page 43, in the General Operation section of this manual.
Joystick Calibration
This feature allows you to program the precise minimum, maximum and center joystick
positions of your R/C transmitter into the controller’s memory. This feature will allow you to
use the full travel of your joystick (i.e. minimum = 100% reverse, maximum = 100% for-
ward). It also ensures that the joystick’s center position does indeed correspond to a “0”
motor command value.
Joystick calibration is also useful for modifying the active joystick travel area. For example,
the figure below shows a transmitter whose joystick’s center position has been moved
back so that the operator has a finer control of the speed in the forward direction than in
the reverse position.
The joystick timing values can be entered directly in the controllers flash memory using
your PC running the Roborun configuration utility. This method is described in “Loading,
Changing Controller Parameters” on page 134
New Desired
Center Position
Min
Forward
Min
Reverse
Max
Forward
Max
Reverse
FIGURE 59. Calibration example where more travel is dedicated to forward motion