the stepper motor is not rotating just vibrating

Using Arduino Programming Questions
#1

I am using a 28BYJ-48 Stepper motor

#include <Stepper.h>
const int stepsPerRevolution=4096;
Stepper leftStepper(8,9,10,11);
void setup() {
// put your setup code here, to run once:
leftStepper.setSpeed(20);
pinMode(8, OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
Serial.begin(9600);
}

void loop() {
// put your main code here, to run repeatedly:
leftStepper.step(stepsPerRevolution);
delay(100);
}

#2

Try with a much lower speed, after consulting the documentation for the motor driver library.

If that doesn't help, the motor wires may be swapped. With the power off, swap a pair of wires, power up and try again. If that doesn't fix the problem, repeat with another pair of wires.

PS: please read the "How to use this forum" post for instructions on how to post code properly and which important details to provide.

#3

Check your wiring. If you've been following the usual tutorials for the 28BYJ then the connection you have as Stepper leftStepper(8,9,10,11); should be Stepper leftStepper(8,10,9,11);

#4

This seems strange

const int stepsPerRevolution=4096;

to the best of my knowledge (see this web page) the 28BYJ motors have 32 full steps per revolution of the motor

...R

#5

@Robin2 from the web page you posted:

These means that in the recommended half-step mode we will have:64 steps per motor rotation x 63.684 gear ratio = 4076 steps per full revolution (approximately).

#6

Hutkikz:
@Robin2 from the web page you posted:

Very true. However the Arduino is controlling the motor, not the output shaft.

...R

#7