RepRapDiscount Smart Controller issue?

Hi All!

I'm just starting out in the world of RepRap and I'm building my first printer (Mini Kossel) and I'd like to ask for some help with the electronics please!

I've set the electronics up, a Taurino Classic + RAMPS 1.4 with Smart Controller from RRD, but I think there might be a problem with the controller.
I have already made the appropriate changes to the Marlin firmware.

When selecting a menu item, I have to turn the dial two or three notches before the cursor moves.
Also, if I try to move an axis by, say 1mm, it jumps in 2mm increments! I can only get it to move 1mm if I carefully park the dial "between" notches!

The big question is, are my electronics faulty or is this actually the expected behaviour? Is anyone else experiencing this?

Thanks.

Here's a video I made of the phenomenon...

[youtu.be]

In Marlin, in ultra_lcd.cpp there is a define called:

#define ENCODER_STEPS_PER_MENU_ITEM 5
#ifndef ENCODER_PULSES_PER_STEP
#define ENCODER_PULSES_PER_STEP 1
#endif

I had different problems. Menu was OK, but values changed too fast. I changed my encoder_pulses_per_step to 4 and Menu_item to 2. This made moving the axis much more manageable.

Awesome, problem solved. I set mine to:

#ifndef ENCODER_STEPS_PER_MENU_ITEM
#define ENCODER_STEPS_PER_MENU_ITEM 1
#endif
#ifndef ENCODER_PULSES_PER_STEP
#define ENCODER_PULSES_PER_STEP 2
#endif


Thanks very much indeed Hazer!

These settings seemed to fix my situation nicely. Prior to this manual motions of the printer would overmove by a factor of 4. This fixed that. Menu selection is still OK too.

#define ENCODER_STEPS_PER_MENU_ITEM 1

and

#define ENCODER_PULSES_PER_STEP 4