So I used a stepper motor in the past, and it worked as it should, but today I used it again, and I set it up to have 360 steps in a revolution, but when I say motor.step(90) it steps 15(I estimate ), and when I put step(1000) it stepped 180. Is my motor broken or what? I hooked it up like this: https://osoyoo.com/wp-content/uploads/2017/07/stepper_fritzing.jpg

 

Hello,

Looking at the drawing, you are powering the steppermotor is powered with 5 Volts.
What is the stepper motor data?

Bertus

 

Hello,

Looking at the drawing, you are powering the steppermotor is powered with 5 Volts.
What is the stepper motor data?

Bertus

What do you mean with stepper motor data? I am a beginner, so i am not sure. This is my code:

#include <Stepper.h>
int motorPin1=8;
int motorPin2=9;
int motorPin3=10;
int motorPin4=11;


Stepper motor(360,motorPin2,motorPin4,motorPin3,motorPin1);
void setup() {
  motor.setSpeed(75);

}

void loop() {
   motor.step(1000);
  delay(1000);
// motor.step(-100);
}

I put motor.step(-100) in // beacause I was testing if that was the problem.

 

Btw a few hours ago my motor didn't want to go in one side, but it worked perfectly in the other.

 

Hello,

What is the motor voltage and current?

Bertus

 

I know that the voltage is 5V, but I am not sure about the current, I am trying to find documentation online on my stepper(model 28byj-48 ). Thank you

 

Hello,

Strange the current is not given, but it will be in the range of 100 mA.
Are all connections well made?

Bertus

 

Yeah, I am pretty sure that all of the connections are good.

maybe my motor is just "dead"

 

Hello,

Is the powersupply for the 5 Volts stable?

Bertus

 

I'm pretty sure that it is. Thanks for your effort btw

 

First off, the 5Volts may work OK if it isn't moving a load. A 20V power supply would give much better proformance from a 5V stepper motor. The thing about steppers is the current is much more important than the voltage on them. The voltage rating comes from having one coil activated with no stepping at all.

Now to why it's not moving the way you are expecting. That motor has a built in gear box, see how the output shaft is offset? It has a 64 to 1 gear reduction, so it will take 4096 steps to go a full 360 degree rotation.
Steps= (360°/5.625°) * 64 = 4096 steps
From - http://embark360.weebly.com/byj48-stepper-motor.html

 

The rated voltage is OK for up to a few hundred RPM, as the inductive reactance increases, and hence current decreases, the torque starts to drop fairly rapidly.
A much higher P.S. voltage is required for higher RPM, in order for the drive to automatically control the plate rated current of the motor to a constant level. Neither higher or lower.
Max.

 

You're missing steps. If the controller tries to step too fast, the motor will skip steps. First try adding a longer delay between steps. I'm not familiar with the library you're using, but it's likely the SetSpeed() parameter when you setup the controller.

edit --> Google shows me your setSpeed() call sets the max speed in RPM, 75 is pretty low and I would think should be OK.

Second try boosting the voltage to the stepper motor. It's OK to go a little above the rated voltage for the motor. Heat is what kills electric motors. Heat comes from current. In this case it's the average current you're worried about, and since the steps are just a little blip of current, your average current will be very low.

Third do you have anything attached to the stepper that has mass? Try just a piece of tape so you can see it spin.

 

One way to insure a precise step waveform is to insert a forward biased schottky diode in each of the stepper motor driver wires. ... Maybe this will improve performance.

 

Quality stepper controller manufacturers such as Gecko for example, use the continuous rated current operation in all their drives throughout the rpm range of the motor.
Max.

 

Everyone, please look at post #11 and read the second paragraph. The reason it is not moving the desired angle is because it is geared and requires over 4000 steps per rotation.

Bob

 

Thank you all, I will try all of the suggestion.

 

Everyone, please look at post #11 and read the second paragraph. The reason it is not moving the desired angle is because it is geared and requires over 4000 steps per rotation.

Bob

How come you get all of the likes for what I found out about the motor?

 

So I used a stepper motor in the past, and it worked as it should, but today I used it again, and I set it up to have 360 steps in a revolution, but when I say motor.step(90) it steps 15(I estimate ), and when I put step(1000) it stepped 180. Is my motor broken or what? I hooked it up like this: https://osoyoo.com/wp-content/uploads/2017/07/stepper_fritzing.jpg

View attachment 228969

How did you made this diagram???Please name the software

 

What speed are you trying to run at? They cannot go from 0 velocity to a high rate without ramping up the mechanical velocity of the rotor. It sounds like all the pulses were sent but the mechanics could not keep up.