Bipolar stepper and EasyDriver problem

Hello!

I am trying to put together a photo stacking equipment. LCD 1602, IR-remote to camera, stepper moving object or camera.

The problem is controlling the stepper. I have several bipolar, 4-wire bipolar stepper motors coming from DVD-readers, flatbed scanners and printers. But in my setup they all behave in the same way. They don´t rotate, only wiggle.

The steppers are connected absolutely according to all the good tutorials, and I have tested several different codes, all with the same result. The motor reacts, but just jerks a little to and fro. Even tested with two different EasyDriver boards. What makes the stepper motor lock like this? Voltage? Current? What shall I change?

Help! I am new to this field,

Everything else in the project works smothely, LCD-menues, IR-remote for camera and the overall program flow.

But what makes the steppers “cramp”?

Hoping for help to be able to go on!

Harryboss

Let me add some information.

The motors tested are Mitsumi M49SP-2K, Mitsumi M35-SP-7n and a very small one, aprox. 5x12 mm from a DVD-unit.

I have connected to dir, step and ground from Arduino on pins 8 and 9 or 2 and 3 according to code. The motor voltage has been 3.3V, 5V, 9V, and 12V, all with the same result - the motor is stalling!

I have turned the small pot to low, and to high current values.

I have also tried pushing MS1 and MS2 low and high in different cominations. Frequency of the motorsound changes, but it only vibrates.

It seems like the motor takes a step, but immediately is forced back to the first position, that there is a force first in one, then in the other direction.

I realise that I am missing something here, BUT WHAT?

Harryboss

Now it’s been a while since I played with stepper motors, but I’ve come across the same problem as you a few times. I think what it came down to each time was the motor being wired wrong. An ‘A’ or ‘A*’ might be flipped etc… so I’d run through that thoroughly.