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# Write a function <code>F(expected jerk, observed jerk)</code> → <code>Move_to_tighten_strings</code>, and call it once in a while | # Write a function <code>F(expected jerk, observed jerk)</code> → <code>Move_to_tighten_strings</code>, and call it once in a while | ||
Since cheap 6-axis IMUs are really good at recording rotation, I expect the notion of "jerk" to include rotation (with expected rotation always 0). Timing will be really important, but Hangprinter-Marlin already has five <code>nop</code> operations in the middle of the stepping code (see the workhorse function in <code>stepper.cpp</code>), that could be utilized for IMU readings at precisely the right times | Since cheap 6-axis IMUs are really good at recording rotation, I expect the notion of "jerk" to include rotation (with expected rotation always 0). Timing will be really important, but Hangprinter-Marlin already has five <code>nop</code> operations in the middle of the stepping code (see the workhorse function in <code>stepper.cpp</code>), that could be utilized for IMU readings at precisely the right times. | ||
Thanks to [http://forums.reprap.org/read.php?178,344022,445503#msg-445503 Dejay on forums.reprap.org] for pointing out the possibility of a similar mechanism. | Thanks to [http://forums.reprap.org/read.php?178,344022,445503#msg-445503 Dejay on forums.reprap.org] for pointing out the possibility of a similar mechanism. |