I have two Bittles and both are displaying the same problem. Software was downloaded using Arduino. Both enter calibration mode and the left hind lower leg sticks up. We have calibrated several times and get the same result. Do I need to reinstall software from GitHu…
Because I haven't seen your video, I guess you may be powering on Bittle with the lower legs bent to the opposite side.
If your Bittle's left hind leg is in the right direction but doesn't move when calibrating, you may rotate it to the right direction. You should feel a moderate resistance and the joint will lock at the right position. The cause is that the new gears are a little too tight and the resistance triggered the protection algorithm. The servo will reduce the force on the joint to avoid overcurrent.
Hi, do you have a video to show the sticky leg?
Did you get the pre-assembled version? You need to bend the hint leg forward before powering up. They are bent to the opposite position only for packaging.
The servo has an algorithm to avoid over-current when stuck. When a new robot first power up, its gears are still tight. It may mistaken the force as a stuck case and reduce the driving force. Try pull the leg softly to the calibration position then it should be locked there. It should become smooth afterward.