computor based stepper motor

[mashhud zafar]

how i can control stepper motor by giving inputs from computor??????

 

[gidimiz]

Hi,

You will have to build an MCU that will control the stepper motor and has an RS232 connection to the computer. Then from the PC you can send a command like Forward and then the MCU will drive the motor forward, and so on.

 

[bilgekaan]

|

there is no need for a mcu between pc and stepper. you can connect stepper to parallel port. and directly control stepper through parallel port. but there is one constraint that parallel port cannot drive enough current to drive stepper coils so you have to put driver circuit between parallel port and stepper.
vdd
_|_
|_ _|( STEPPER COIL PHASE A)
|
|
|
R | /
pARALLEL PORT ------/|/|/|----------- /
| \
_\/
|
|
gnd


Even if you are using mcu between stepper and pc you have to use this kind of circuit to drive stepper because mcu also cannot drive enough current for stepper

 

[Srammie]

You have to know what type of stepper motor you have. Bipolar/unipolar etc. When its a bipolar you can use the L297/L298N combination. With this combination the only thing u have to do is control direction and give pulses ;-) PM me if you want the schematic and single sided layout..

If you can use the parallel port aswell i would use it. There are loads of programs out there that control the parallel port.

One last thing these L297/298 chips are expensive so maybe the best thing is to look for a complete (used) controller. In many cases these are cheaper then the individual parts alone!