[ Arduino # 4 ] Turn the pulley with a stepping motor and stop at a fixed position. (With subtitles)

This is the continuation video of # 1 "Let's try turning the stepping motor".
Once you are able to spin the motor, you now want to stop it in place.
So I'll show you how to use a photomicrosensor to stop in place.
If you turn the stepping motor fast from the beginning, change the speed on the way, or repeat running and stopping, the angle will inevitably shift.
I think you want to run the machine continuously.
I hope you find my method helpful.