The big picture, I'm building a machine that will fold and throw a paper airplane. I'm very close but am having a problem. I have gear motors moving belts that move the paper from one process to the next. I have mosfets switching the motors on and off, and switches or infrared sensors to know when to stop the motors. My problem is that the motors keep turning several hundred milliseconds after they are told to stop by the programing. My program is working exactly like i want based on serial outputs i put into each step of the program. my questions are about the wiring that is letting the motor keep going. I have capacitors at each motor and diodes to assist in pulling down the mosfets.
I don't know much about the part numbers of the mosfets capacitors or diodes. I could try to figure it out if you guys really want to know. I'd like to know if there are specific mosfets that will switch faster than others, and anything else i can do to stop the motors faster. I don't want to use encoders because I don''t have the money to replace the motors, and I need to account for the paper slipping and not being moved perfectly by the belts. below Is a video of my machine when I had it in my BFA thesis show I have made significant changes since then I hope it will give some understanding of my project. http://www.youtube.com/watch?v=ES53pFYZUCE