Stepper Motor(28BYJ-48)

The 28BYJ-48 is a stepper motor that can be used with Arduino and MCU controller boards. This document involves the use of the ULN2003 motor driver.

Specifications

• Operating Voltage: 5V
• Step Angle: 5.625°
• 64-step motor
• Half 4 wire

Example Required Hardware

• Arduino board
• Jumper cables
• Stepper motor (28BYJ-48)
• Stepper motor driver (ULN2003)

Connection

The stepper motor is connected to the motor driver with a connector, which is not detailed here.

Arduino	Stepper Motor Driver
D12	IN1
D11	IN2
D10	IN3
D9	IN4
VIN	+
GND	-

Example Code Overview

The example demonstrates making the stepper motor rotate one full turn clockwise, waiting for 1 second, then one full turn counterclockwise, followed by another 1-second wait, in a repeating loop.

#include <Stepper.h>
#define IN1 12
#define IN2 11
#define IN3 10
#define IN4 9

const int stepsPerRevolution = 2048; // [360/5.625*64/2=2048]
Stepper step1(stepsPerRevolution, IN4, IN2, IN3, IN1); // Note the sequence 4,2,3,1
void setup() {
  step1.setSpeed(10);
}
void loop() {
  step1.step(2048);
  delay(1000);
  step1.step(-2048);
  delay(1000);
}