Itty Bitty Buggy: Car Movement Tutorial (mDesigner)
From Microduino Wiki
Car
Car blocks are blocks which controls both of the motors at the same time in order to move the forward / backwards (Car - Move block) or turn left / right (Car - Turn block). These are convenience functions designed to be "general purpose". Motors can be controlled directly with the Motor blocks. See section #Motors.
Motors
Motor blocks are blocks which controls the motors (A/B) on Buggy Base directly. This gives the user the ability to fine tune the behavior of the motors. These blocks can set the movement direction of the motors (Motor - Set Speed block) or brake / stop the motors (Motor - Brake block).