[RETIRED] Stepper motor driver A4988

It works well and stable what it was built for. Control NEMA 23 Unipolar very good. Bye.

I needed to enable the camera to take several shots in a row at certain time intervals and rotate the polarizing filter on the lens for a certain angle between the shots. I achieved this by using a Dasduino and a stepper motor with the associated A4988 driver. The stepper motor is small in size and with a large speed reducer (1: 64) so that very fine control of the rotation angle is possible. The motor works with a low voltage that it receives from Dasduino, and no additional power supply is required. The necessary program for the stepper motor is available in one of the tutorials, so a minimal modification was required to obtain the required angle of rotation of the filter on the lens. Dasduino, after turning the motor to the required angle, sends the necessary exposure signal to the camera via an optocoupler (the camera has a special input for the remote control, Canon EOS 450D). The stepper motor, although very small, has enough power to turn the filter on the camera lens due to the large speed reducer. All together, it is no bigger than the Dasduino itself, and the mechanical parts for mounting the motor to the camera lens are made using a 3D printer. The number of exposures and changes in motor operation are possible by editing the code, so the whole system is simple, yet very flexible and adaptable to changing requirements.