Cytron Technical Forum

Referring to the topic above, I failed to drive my stepper motor with the driver. If I don't use UART, by sending pulse of 1000 ms into the pulse port, nothing happen? On and Off continuosly, what should i send in to control the rotation of stepper motor?? If I want to use arduino digital port like port 13 to send in the pulse, what kind of pulse or program should i use? Need help in urgent, Thanks.

Have you check out the arduino stepper motor library: http://arduino.cc/en/Reference/Stepper

But, now I am using SD02B and there's only 1 port for me to send in the pulse(not tx and rx), and after I read the user manual, I tried to send in the blinking pulse but the motor runs out of control, its like totally slipping, very high speed no matter what pulse I change~

Do this motor driver have button for fast testing?

Slipping ?
Normal for stepper motor slipping, I check ->

Stepper motor coil resistance
Stepper motor phase wiring - Most likely
Stepper motor sizing (is it undersized ?)

You can press the TEST button on SD02B to test the driver. Most likely it's because of wrong wiring. Can you follow the instruction in SD02B user manual to determine the wiring sequence? Another possible reason is the pulse you sent is higher than the working frequency of your stepper motor. Try keep it at very low rate first.

The wiring is correct coz when i press the test button, it runs normally. Can you pls suggest a program of arduino uno for me? Which can be used to trigger the "Pulse Port" of SD02B. Thanks alot.

For starting, you put pulse at low frequency or that means you give higher delay for the pulse.
Ex stepper motor driver.

Did you tie EN pin to 5V and DIR pin to either 0V or 5V? Or you left the pins floating?

my EN pin must connect to 5V (even i don't want the motor shaft to be hold) and DIR must 0V or 5V? floating of these 2 will cause problem?