This is a page describing the LineRunner algorithm for the SwampTiger. It is a general PID (Proportional to error, Integral (sum) of the error, Derivative (change) of the error), and I believe is organized unusually well for a NXT-G program. Besides being organized well, it has the ability to cycle through different PID values during a series of runs so people can see how the different values impact the line-following behavior.
Besides the visual document below, the following links may be useful:
Note that some of these images are 1400 pixels wide and are shrunk to display inline. You can enlarge them by opening them in their own window.
SwampPid
Calibrate
ConfigPID
ResetCounters
DecideMove
CalcError
CalcIntegral
CalcTurn
UpdatePreviousError
CalcBMotor
DisplayValues
MakeMove
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