View source for Chico joint calibration

We explain here how to calibrate Chico's joint encoders.

= General calibration procedure =

* Power-cycle (i.e., switch off and on) the board controlling the joint that you want to calibrate.

* With the emergency/fault button pressed down, launch <code>iCubInterface --config $ICUB_ROOT/app/iCubLisboa01/conf/icubRaw.ini</code>

* Launch <code>robotMotorGui</code>

* Manually align the joints to a desired zero position and write down the values provided by <code>robotMotorGui</code>

* Open <code>$ICUB_ROOT/app/iCubLisboa01/conf/iCub_Calibration_Lisboa_001.xls</code>

* Go to the desired joint section; edit the yellow fields with the <code>robotMotorGui</code> values that you have previously noted down; observe the resulting red values.

* Edit <code>$ICUB_ROOT/app/iCubLisboa01/conf/icub_<limb>_safe.ini</code> and write the new "red" values that you have just read in the XLS. The rows to edit are typically: Zeros, Min, Max, Encoders, Calibration1, Calibration3.

* Update <code>$ICUB_ROOT/app/iCubLisboa01/conf/icub_<limb>.ini</code> as well.

* With the emergency/fault button must be pressed down, launch <code>iCubInterface --config $ICUB_ROOT/app/iCubLisboa01/conf/icubSafe.ini</code>

* Verify these things:
** that the zero position makes physical sense, i.e., it is really close to the desired zero;
** manually move the joints a bit around the zero position, check that the values provided by <code>robotMotorGui</code> are changing continuously, without glitches or jumps

* Calibration is now complete. You are ready to run <code>iCubInterface</code> with the motors enabled (emergency button up).

= Example: shoulder calibration =

* With <code>canLoader20</code>, flash the old firmware version 1.51 to board number 2 (example for right shoulder: pcan, net 2, board 2).

* For the <code>icubRaw.ini</code> phase, follow the instructions of the general calibration procedure above, and proceed in this order:
** Manually place the 3 shoulder joints to a position that is consistent to the desired values (0, 0, any). This corresponds to the arm being vertical and perpendicular to the floor. Write down the first two encoder values provided by <code>robotMotorGui</code>; let's call them "first value" and "second value".
** Next, manually put the shoulder to position (first value - 30, second value + 30, 0), which means that the first two values are given by the formula, while the third joint must be in a position that corresponds to the desired zero. Take note of the "third value" provided now by <code>robotMotorGui</code>.

* Update the XLS file as per general procedure.

* With <code>canLoader20</code>, flash back to the new firmware version 1.53.

[[Category:Vislab]]