Arduino ULN2009 Drive Stepper Motor

I. Physical map

Two. Example code

Note: code from Foreigner http://www.4tronix.co.uk/arduino/Stepper-Motors.php

Function: Control motor positive and negative turn

This Arduino example demonstrates bidirectional operation of A//28byj-48, using a ULN2003 interface board to drive th e stepper.//The 28byj-48 motor was a 4-phase, 8-beat motor, geared down by//a factor of 68. One bipolar winding is on motor pins 1 & 3 and//the other on motor pins 2 & 4. The step angle is 5.625/64 and the//operating Frequency is 100pps. Current draw is 92mA.    Declare variables for the motor pinsint motorPin1 = 8;    blue-28byj48 pin 1int motorPin2 = 9;    pink-28byj48 pin 2int motorPin3 = 10;    yellow-28byj48 pin 3int motorPin4 = 11;  ORANGE-28BYJ48 pin 4//RED-28BYJ48 pin 5 (VCC) int motorspeed = 1200;          Variable to set stepper speedint count = 0; Count of steps Madeint Countsperrev = 512; Number of steps per full revolutionint lookup[8] = {B01000, B01100, B00100, B00110, B00010, B00011, B00001, b01001};/// ////////////////////////////void Setup () {//declare the pins as outputs Pinmode (motorPin1, out  PUT);  Pinmode (motorPin2, OUTPUT);  Pinmode (motorPin3, OUTPUT);  Pinmode (MotorPin4, OUTPUT); Serial.begin (9600);} void Loop () {if (Count <  Countsperrev) clockwise ();  else if (count = = Countsperrev * 2) count = 0;  else anticlockwise (); count++;} Set Pins to ULN2003 high in sequence From 1 to 4//delay "motorspeed" between each pin setting (to determine speed) void anticlockwise () {for (int i = 0; i < 8;    i++) {setoutput (i);  Delaymicroseconds (Motorspeed);    }}void clockwise () {for (int i = 7; I >= 0; i--) {setoutput (i);  Delaymicroseconds (Motorspeed);  }}void setoutput (int out) {digitalwrite (motorPin1, Bitread (Lookup[out], 0));  Digitalwrite (MotorPin2, Bitread (Lookup[out], 1)); DIgitalwrite (MotorPin3, Bitread (Lookup[out], 2)); Digitalwrite (MotorPin4, Bitread (Lookup[out], 3));}

　　

Arduino ULN2009 Drive Stepper Motor