|The new 3-Amp motor controller
with multiple interface and feedback options simplifies servo control of
commonly available DC motors. The module features three independent
interfaces: a serial protocol for micro-controller-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 new 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
The motor controller measures 1.4" x 1.4"
and has an operating voltage of 6–18 volts, making the device
well-suited for small robots and other projects using toy motors and
rechargeable 7.2 V or 9.6 V battery packs. 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 sizes and hobby RC servos.
Please read the manual
for further information.