Motor Controller - Pololu TReX Jr.

Replacement: None. There is no direct replacement for this motor controller. This page is for reference only.

The TReX Jr Dual Motor Controller from Pololu is a versatile DC motor controller designed to seamlessly blend autonomous and human control of small robots. The TReX Jr can control two bidirectional and one unidirectional motor via three independent control interfaces: radio control (RC) servo pulses, analog voltage, and asynchronous serial (RS-232 or TTL). Using the compact MC33887 motor driver allows for a single-board design that reduces cost while maintaining a small package. As an added benefit, the use of the MC33887 motor driver allows operation to 24V.

The serial interface can switch instantly with one of the other two interfaces, allowing mixed autonomous and remote control. For example, a robot could be configured to run autonomously most of the time, but a human operator could override the autonomous function if the robot gets stuck or into a dangerous situation. If the serial mode is selected as the primary interface, high-resolution measurements of all five channel input signals (be they RC pulses or analog voltages) are made available to the autonomous robot controller, allowing for complex and unlimited mixing of operator control and sensor input.

  • 5-24VDC supply
  • 2 bidirectional, 5A peak, up to 2.5A continuous primary motor outputs
  • 1 unidirectional, 10A continuous auxiliary output
  • 128 step speed control in each direction
  • Three control interfaces: RC servo pulses, analog, or serial
  • 5 input channels (RC servo or analog)
  • 12-bit resolution with 1us accuracy for the RC pulses
  • 10-bit resolution on the analog output
  • Both RS232 and TTL bidirectional serial interfaces
  • Supports baud rates between 1200 and 115,200bps.
  • 1.75x1.75x0.5"


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

Customer Reviews

No reviews yet.