Jrk 21v3 USB Motor Controller with Feedback (Fully Assembled)

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  • Jrk 21v3 USB Motor Controller with Feedback (Fully Assembled)
  • Jrk 21v3 USB Motor Controller with Feedback (Fully Assembled)


Jrk 21v3 USB Motor Controller with Feedback (Fully Assembled)

Pololu 1394

The Jrk 21v3 is a versatile, general-purpose motor controller that supports a variety of interfaces, including USB. The broad operating range from 5 V to 28 V and continuous output current of 3 A (5 A peak) allow this board to control most small DC brushed motors. Analog voltage and tachometer (frequency) feedback options allow quick implementation of closed-loop servo systems, and a free configuration utility (for Windows) allows easy calibration and configuration through the USB port. A USB A to mini-B cable (not included) is required to connect this controller to a computer.
Key improvements over competing products and earlier Pololu motor controllers with feedback include:

  • USB connectivity with emulated serial (COM) port allows direct motor control from a PC
  • Ultrasonic PWM to eliminate switching-induced motor shaft hum or whine
  • Robust, high-speed communication protocol with user-configurable error condition response
  • High internal resolution (12 bits) for smooth and flexible calibration to various input and feedback devices
  • Current sensing and limiting
  • Reversed power protection
  • Field-upgradeable firmware

This kit comes fully assembled with 0.1" male header strips and terminal blocks pre-installed with and connections soldered.

Jrk 21v3 Motor Control Specifications:


Motor driver: MC33926
Motor channels: 1
Control interface: USB; non-inverted TTL serial;
RC servo pulses; analog voltage1
Minimum operating voltage: 5 V
Maximum operating voltage: 28 V
Continuous output current per channel: 3 A
Peak output current per channel: 5 A
Current sense: 0.5 V/A2
Maximum PWM frequency: 20 kHz
Minimum logic voltage: 4 V3
Maximum logic voltage: 5 V
Reverse voltage protection?: Y
Partial kit?: N


Jrk 21v3 Motor Controller Dimensions:

  • Size: 34.3 x 34.3 x 12.7 mm (1.35" x 1.35" x 0.5")
  • Weight: 6.5 g
  • Mounting Hole Size: #2 (not included)

Jrk 21v3 Motor Controller Dimensions


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Additional Information

Part Number:
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1 Review

  • 5
    Title of review 860

    Posted by Keith on 16th Aug 2012

    Pololu's JRK controllers are amazing with huge power from a tiny board. Very fine control using a joystick and ability to program it via its own USB connector make this a remarkable motor control board.It's also bulletproof as I've discovered!!Thoro

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