This powerful 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-004639
Supplier: [Pololu MPN:3146]
With integrated support for analogue 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 analogue voltages for use with a potentiometer or analogue joystick. They also offer many settings that can be configured using our free configuration software utility. 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(1)||24 V(2)||34 V(3)||24 V(2)||34 V(3)|
|21 V||12 V||18 V||28 V||18 V||28 V|
|Max continuous current
(no additional cooling):
|3 A||12 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″||1.4″ × 1.2″||1.7″ × 1.2″|
1 Transient protection to 40 V.
2 30 V absolute max.
3 40 V absolute max.
The Jrk G2 18v19 operates from 6.5 V to 30 V and can deliver a continuous output current of 19 A without a heat sink. Note that 30 V is the absolute maximum for this controller; the maximum recommended operating voltage is 24 V, and the maximum recommended nominal battery voltage is 18 V. For applications using higher voltages (such as 24 V batteries), we recommend the higher-voltage Jrk G2 24v13 or Jrk G2 24v21.
If you need to identify which version you have, you can just plug it into a computer through USB and the Jrk software will tell you. For quick visual identification without a computer, you can distinguish this version from the identically sized Jrk G2 24v13 by the number 150 on top of the tall silver electrolytic capacitors.
The Jrk ships with a 0.1″ breakaway male header strip and two 2-pin 5mm terminal blocks. You can solder the terminal blocks to the four large through-holes to make your motor and motor power connections, or you can solder an 8-pin piece of the 0.1″ header strip into the smaller through-holes that border these larger holes. Note, however, that the terminal blocks are only rated for 16 A, and each header pin pair is only rated for a combined 6 A, so for higher-power applications, thick wires should be soldered directly to the board.
A 10-pin piece of 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, or you can solder wires directly to these holes for the most compact installation.
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″ × 1.4″ × 0.42″1|
USB; non-inverted TTL serial; I²C;
RC servo pulses; analogue voltage
|Minimum operating voltage:||6.5 V|
|Maximum operating voltage:||30 V2|
|Continuous output current per channel:||19 A3|
|Maximum PWM frequency:||20 kHz|
|Reverse voltage protection?:||Y|
|Version:||G2 18v19 (30 V max, 19 A max continuous)|
|PCB dev codes:||umc05a|
|Other PCB markings:||0J11042, blank white box|