A high-power version of our 3-Amp motor controller, the SMCO4 has the same convenient interfaces (serial, hobby RC pulse, or analog) and improved (10-bit) closed-loop PID control of motor speed or position, all with a more powerful motor driver that can handle higher-current motors.

New Revision: We are now shipping a new revision of our SMC04 motor controller that uses the VNH2SP30 H-bridge chip instead of the older, VNH3SP30 chip. The operating voltage of the SMC04 is now lower (up to 16 V instead of 18 V), but in all other respects, this new revision will perform better (including higher PWM frequencies and better current support). For a comparison of the two chips, please see the VNH2SP30 carrier board product page.

The SMC04 high-power motor controller with feedback has multiple interface and feedback options that simplify servo control of commonly available DC motors. The module features three independent interfaces: a serial protocol for microcontroller-based applications, a pulse-width interface for connection to hobby radio control equipment or serial servo controllers, and an analog voltage interface for simple tests and demonstrations. Two feedback alternatives allows for closed-loop control of position or speed. The SMC04 is higher-current version of our 3-A motor controller with feedback that can handle larger motors with its VNH2SP30 motor driver chip, which is also available by itself and on a carrier board.

The SMC04 motor controller distinguishes itself from other devices in its class by offering a complete feedback-based solution for applications requiring bi-directional, closed-loop control. The user can select either an analog voltage feedback or a digital encoder feedback (quadrature encoding is not supported). With the two feedback alternatives, various simple devices such as potentiometers can be used as sensors to achieve position or speed control.

In a typical application, a user first sets up the motor controller’s parameters based on the physical properties of the mechanical system that is being driven. A feedback potentiometer is coupled to the mechanism output, and the user can then send position commands to the motor controller, which automatically drives the motor to reach the position. Alternatively, the mechanism and sensor can be arranged to provide speed feedback, in which case the motor controller maintains given speeds despite fluctuations in friction or supply voltage.

The motor controller measures 2.475" x 1.175" and has an operating voltage of 6–16 volts, making the device well-suited for medium-sized robots and other projects powered by rechargeable 7.2 V or 9.6 V battery packs or 12 V lead-acid batteries. The motor controller serial protocol is compatible with other Pololu motion control devices, allowing multiple units to be connected to a single serial line to control a mixture of motors and hobby RC servos.