Auto Marble Machine

Remake of the 3D Printed Marble Machine #2 - Designed by Tulio Laanen (http://www.thingiverse.com/thing:795952) including a small stepper motor for continuous operation.

https://youtu.be/pe5QDOH1b50

A new base was added to house the motor, lights and electronics. I also add a small drawer to store the metal balls when not in use and a new cap instead of the turning blade. The lift was also modified to fit the motor and the cap.

I didn't modify the track of the original design but then it has to be manually modified to fit the motor and lights. The modification consists in drilling a 9.5 mm hole through the base in the center of the lift housing to fit the motor, and drilling several 5 mm holes to fit the LED's.

I used a small and inexpensive step motor 28BYJ-48 fixed with super-glue to the track base. The electronics are very simple: A PIC 16F628A programmed to generate 4 channels of sequenced pulses to the motor's driver ULN2003 and a 7.5 V 300 mA to power separatly the PI