The 3D Printed Marble Machine 3 stepper mod 28byj-48

This is a mod for The 3D Printed Marble Machine 3 by Tulio with a 28byj-48 stepper motor instead of the manual lift of the balls.

arduino Library : http://www.airspayce.com/mikem/arduino/AccelStepper/

arduino code:
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#include
#define HALFSTEP 8

// Motor pin definitions
#define motorPin1 3 // IN1 on the ULN2003 driver 1
#define motorPin2 4 // IN2 on the ULN2003 driver 1
#define motorPin3 5 // IN3 on the ULN2003 driver 1
#define motorPin4 6 // IN4 on the UL