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استپر موتور به زبان انگلیسی    DRIVING STEPPER MOTORS WITH THE L293D    /   Stepper motors are great to use in robotics. By energizing the coils in themotor in a particular sequence, a motor takes 48 or more small, precise steps to make one full revolution. If you are using two of these motors to driveyour  robot’s wheels, you can get good control over how far it travels by makingthe  motors travel x many steps forwards or backwards. That’s assuming youcan  find stepper motor drivers, of course. I’ve always had problems finding good servo drivers. Once I was even reduced to using discreet components (say it isn’t so!) to drive my steppers. Then I got my hands on the L293D motor driver chip (See motors part 1) and life got a lot easier. The L293D contains two H-bridges for driving smallDC  motors. Now the home-viewing audience might say: "Rob, it’s easy to drive DC motors. What I need to do is drive a stepper motor." No problem. After all, what is a DC motor but a coil and the L293D drives two of them backwards  or forwards. That’s what stepper are - two (or more) coils being  driven in a sequence, backwards and forwards. So one L293D can, in theory, drive one bi-polar 2 phase stepper, if you supply the sequence. I found some close-out two-phase bi-polar steppers (part#117954) in the  Jameco Catalog. For six bucks plus shipping I get a 7.5 degree stepper  with 48 steps per revolution. The stepper motor runs at about 5 volts and pulls 800 milli-

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