This compact motor controller makes closed-loop speed or position (but not both!) control of a brushed DC motor easy, with quick configuration over USB using our free software.
In stock in Australia
Our Code: SKU-004772
Supplier Link: [Pololu MPN:3142]
With integrated support for analog voltage or tachometer (frequency) feedback, the second-generation G2 family of Jrk motor controllers makes it easy to add closed-loop control of speed or position (but not both!) of a single brushed DC motor to a variety of projects. These versatile, general-purpose modules support five different control interfaces: USB for direct connection to a computer, TTL serial and I²C for use with a microcontroller, RC hobby servo pulses for use in an RC system, and analog voltages for use with a potentiometer or analog joystick. They also offer many settings that can be configured using our free configuration software utility for Windows, Linux, and macOS. This software simplifies initial setup of the device and allows for in-system testing and monitoring of the controller via USB (a micro-B USB cable is required to connect the Jrk G2 to a computer).
The table below lists the members of the Jrk family, including the original (green) versions, and shows the key differences among them.
|28 V(1)||16 V||28 V(1)||24 V(2)||34 V(3)||24 V(2)||34 V(3)|
|24 V||12 V||24 V||18 V||28 V||18 V||28 V|
|Max continuous current
(no additional cooling):
|2.5 A*||12 A||2.6 A||19 A||13 A||27 A||21 A|
|TTL serial, USB,
Analogue, RC control:
|Hardware current limiting:|
|Dimensions:||1.35″ × 1.35″||1.85″ × 1.35″||1.0″ × 1.2″||1.4″ × 1.2″||1.7″ × 1.2″|
|1 Transient operation (< 500 ms) up to 40 V.
2 30 V absolute max.
3 40 V absolute max.
* Reduced from “3 A” based on newer, more stringent tests. The value now is directly comparable to the rating for the newer G2 21v3.
Pololu Jrk G2 18v19 USB Motor Controller with Feedback controlling an industrial-duty linear actuator with an RC receiver.
Pololu Jrk G2 18v27 USB Motor Controller with Feedback controlling a high-power motor from USB.
The Jrk G2 21v3 operates from 4.5 V to 28 V and can deliver a continuous output current of 2.6 A (5 A peak) without a heat sink. The controller supports transient operation (< 500 ms) up to 40 V, and the maximum recommended nominal battery voltage is 24 V. This version has header pins and terminal blocks included but not soldered, so soldering is required to use it.
A version is also available that requires no soldering to use as the terminal blocks and main header pins are already installed.
The Jrk ships with a 0.1″ breakaway male header strip and two 2-pin 3.5mm terminal blocks. You can solder the terminal blocks to the four large through-holes to make your motor and motor power connections (see our short video on terminal block installation), or you can solder a couple of 2-pin pieces of the 0.1″ header strip into the smaller through-holes above and below these larger holes.
Pieces from the 0.1″ header strip can be soldered into the small holes on the logic connection side of the board to enable use with solderless breadboards, perfboards, or 0.1″ connectors. For the most compact installation, you can just solder wires directly to the holes.
Note: A USB A to micro-B cable (not included) is required to connect the Jrk G2 to a computer for initial configuration.
The Jrk G2 family features a number of improvements compared to our original two Jrk motor controllers (21v3 and 12v12). Most importantly, the Jrk G2 controllers support both higher operating voltages and larger output currents while being even more compact than their predecessors. Other new features include:
The Jrk G2 controllers are not drop-in replacements for the original Jrk controllers because of differences in their form factors and pin arrangements, although wiring changes should be straightforward. The Jrk G2 serial protocol is compatible with (and generally a superset of) the original Jrk serial protocol, so in many cases, serial interface software running on a microcontroller or computer will not need to be modified to work with a Jrk G2.
|Size:||1.2″ × 1.0″ × 0.3″1|
USB; non-inverted TTL serial; I²C;
RC servo pulses; analogue voltage
|Minimum operating voltage:||4.5 V2|
|Maximum operating voltage:||28 V3|
|Continuous output current per channel:||2.6 A4|
|Maximum PWM frequency:||20 kHz|
|Reverse voltage protection?:||Y|
|Version:||G2 21v3 (28 V max, 2.6 A max continuous)|
|PCB dev codes:||umc06a|
|Other PCB markings:||0J11316|
User’s manual for the Pololu Jrk G2 USB Motor Controllers with Feedback.