The closed-loop drive is to feedback the rotation angle of the stepping motor to the control panel, compare the distance that needs to be rotated with the distance of the actual rotation, calculate the error value, and then compensate, so as to prevent the problem of multi-step and lost step. The closed-loop drive can completely overcome the lost step of the open-loop stepping motor, and can also significantly improve the performance of the motor at high speed
The smart stepper related hardware is released under the Creative Commons Attribution Share-Alike 4.0 License as much of the work is based on Mechaduino project by J. Church https://github.com/jcchurch13/Mechaduino-Firmware and nano_stepper project by Misfittech. https://github.com/Misfittech/nano_stepper Our work is mainly to optimize the wiring port to adapt to the common 3D printer motherboard in the market.
The firmware is licensed as GPL V3 for non-commercial use.