Pololu TReX - Manual (Page 13)

Learning mode phase 1: learning neutrals
While the red LED is on solid, the TReX is attempting to learn the neutral values of all five channels. Do NOT move
the control sticks at all while the red LED is on. It should only take around two seconds for this first phase, though
it could be much shorter if the TReX encounters problems learning the neutrals for all five channels. If any RC pulse
errors occur during the learning process or if the channel variance is too large, the TReX will not learn the channel.
Learning mode phase 2: neutral learning report
Once phase one is through, the TReX will flash its status LEDs five times to indicate neutral-learning success or
failure for each channel. A green flash means that the neutral value was successfully learned for the corresponding
channel. A red flash means there was a problem and that channel will not be learned. For example, a flash pattern of
“red, red, green, red, green” means that neutrals were learned successfully for channels 3 and 5; channels 1, 2, and 4
will not be learned. If all five flashes are red, the learning process terminates here.
Learning mode phase 3: learning the extremes
This phase begins when both the red and green status LEDs light simultaneously and lasts approximately ten seconds.
During this time, the TReX is attempting to determine the maximum and minimum values for each of the five
channels. You should try to hold each channel at each of its two extremes for at least half a second. Move the control
sticks around slowly and steadily. If you jerk them around very rapidly the TReX may reject the channel inputs as
unreliable. If any RC pulse errors occur or if the channel variance isn’t large enough, the TReX will not learn the
channel.
Learning mode phase 4: final learning report
This phase is identical to phase 2, except here the green flashes represent channels that were fully learned. The
flashing pattern will repeat until the TReX is reset. Now every time the TReX starts up, it will quickly flash the LEDs
in this pattern to indicate which channels are calibrated and which are not.
Note: Once learning is complete, you should remove the learning-mode jumper and reset your TReX.
Pololu TReX User's Guide © 2001–2013 Pololu Corporation
3. Getting Started Page 13 of 24