SKU: 15441799400

Pololu TReX Jr Dual Motor Controller DMC02

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Description

Pololu TReX Jr Dual Motor Controller DMC02This lower power, smaller, and lower cost version of the TReX is the ultimate general purpose motor controller for small motors: it has a wide operating range (5 to 24 V), delivers 2. 5 A continuously per motor, provides current sensing on the two main channels, and it features the TReX triple interface that allows you to control motors from a serial line (RS 232 or TTL), radio control (RC) receiver, or analog voltage source such as a potentiometer. A

This lower-power, smaller, and lower-cost version of the TReX is the ultimate general-purpose motor controller for small motors: it has a wide operating range (5 to 24 V), delivers 2.5 A continuously per motor, provides current sensing on the two main channels, and it features the TReX triple interface that allows you to control motors from a serial line (RS-232 or TTL), radio control (RC) receiver, or analog voltage source such as a potentiometer.

A novel blend of serial, RC, and analog motor control
The TReX Jr Dual Motor Controller, a lower-power version of the TReX Dual Motor Controller, 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 24 V.

The TReX Jr uses five input channels to receive the RC or analog control signals. When operating in RC or analog mode, the five channels function as follows:

  • Channel 1: motor 1 speed and direction or, if in mix mode, turn left/right
  • Channel 2: motor 2 speed and direction or, if in mix mode, go forward/reverse
  • Channel 3: auxiliary (unidirectional) motor speed
  • Channel 4: can be used to enable “flipped mode”, which allows invertable robots to be controlled as normal when they are inverted
  • Channel 5: determines whether the motors are controlled by the channel inputs or the serial interface; this channel allows you to switch between autonomous and human control at will


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. For example, the TReX would be a great motor controller for a remotely controlled balancing robot.

Technical specifications

  • Dimensions 1.75" x 1.75" x 0.5" (0.3" height without connectors)
  • Supply voltage 5 - 24 V
  • Primary motor outputs 2 bidirectional, 5 A peak, up to 2.5 A continuous (may be combined to control 1 bidirectional, 5 A continuous)
  • Auxiliary output 1 unidirectional, 10 A continuous
  • Speed control 128 steps in each direction
  • Control interfaces RC servo pulses, analog voltages, or serial commands; master interface set by mode-select jumper
  • Input channels 5 (RC servo pulses or analog voltages)
  • RC pulse measurements 12-bit resolution, 1 us accuracy
  • Analog measurements 10-bit resolution
  • Serial interface both RS-232 and TTL (logic level), bidirectional
  • Baud rates supports 11 common baud rates ranging from 1200 to 115,200 bps
  • Expanded protocol Allows multiple Pololu servo and motor controllers on one serial line
  • Compact protocol Allows both motors 1 and 2 to be simultaneously set with just three bytes


Documents


Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 15441799400

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karen denner
New York, US
★★★★★ 5
Your fur kid will thank you!
Color: Yellow Green, Size: 6 Inch
My dog absolutely LOVES this toy! I recently adopted a rescue & wasn’t sure what she might like, so I bought this in a 6” size for a 50# shep/lab/hound. The ball comes with a cute little pump with needle which only takes a few seconds to inflate. I put the ball outside for her; she wasn’t sure of it at first but it didn’t take her long to realize how fun it was to throw around & chase. She throws it up in the air by the loops & runs all over the yard with it & it’s so comical to watch! It seems pretty durable & well made - I’m shocked she hasn’t punctured it by now, but if she does I will definitely buy her another….and another. This is easily her favorite toy. I highly recommend it for your fur kid - you won’t be disappointed, & neither will they..
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Reviewed in the United States on April 21, 2026
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Ladyshell
Dallas, US
★★★★★ 5
First ball was great!
Color: Black Green, Size: 8 Inch
This ball was great! My dog loves it. I ordered another smaller one. It had no pump and the inside was separated from the outside piece so it couldn’t be pumped up.
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Reviewed in the United States on May 18, 2026
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AMM
New York, US
★★★★★ 5
Fun and durable
Color: Flag, Size: 6 Inch, Color: Flag, Size: 6 Inch
I have a 5 month old teething Whippet puppy and this toy is a favorite. She loves carrying it around by the straps, playing tug, and trying to chew it. I think it’s pretty tough and durable for someone her size. I could see how a shepherd might destroy it quickly, though. I was surprised to find you have to inflate it, but the pump and needles are included and it hasn’t lost any air over several days of rough play. (I kick it and toss it to her. We tug with the straps. She carries it everywhere.) The material feels like a heavy duty soccer ball, just smaller. It’s the perfect size for her. I’d definitely buy it again.
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Reviewed in the United States on May 1, 2026
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Leo
Fort Morgan, US
★★★★★ 4
It's a (smaller) soccer ball with nylon straps. Will no last long for aggressive chewers.
Color: Black Green, Size: 8 Inch
As the item title states, it's a soccer ball with straps. It feels like a soccer ball, but smaller and doesn't make any noises. The 8 inch size just right for my 50 lb dog. He can't get his mouth around the ball, but can bite down on the straps as we kick it around. He also plays and tosses it around by himself. It's also easy to clean. It's a good item, but suffers from two issues. 01) The nylon straps are tough, but not as durable as I though. My dog is aggressive chewer and has managed to chew them up a bit. 02) There is a nylon strap that is longer than all the others, so he tends to focus on that one. After about 15 days of playing with hit, he's managed to chew that strap up to the point that it's almost falling off. It would be nice if all the straps were the same, larger, size.
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Reviewed in the United States on October 27, 2025
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debra
West Palm Beach, US
★★★★★ 5
Highly recommend
Color: Black Green, Size: 8 Inch
I was skeptical that it would hold up to our aggressive chewer puppy (staffyX) - especially during teething. But it has survived past teething into adult chompers and is still fantastic! Its his favorite outside toy, especially the tags make it fun (and those have been holding up well too). If/when it fails, I'll buy another one.
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Reviewed in the United States on May 2, 2026

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