He hooks up the SN754410 to two motors, giving him speed and direction control for both based on the duty cycle of a PWM signal entering the chip for less than $2.50.

Both the motor and the encoder are connected to an Arduino Pro Mini which receives step and direction commands from the printer controller.

The OEM module features exceptional motor control properties and also contains very fast digital current control bandwidth capabilities enabling peak DC motor current (and therefore torque) control.

This library includes dozens of Arduino sketch examples,” according to its maker, New York-based Teknic. For a more comprehensive programming environment, there is a C++ library which includes example ...