1433 Pololu 1394 Pololu NewCondition
Pololu jrk 21v3 USB motor controller with included hardware soldered in (fully assembled).

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

44.21

Product Code : 1433

In Stock Now : 1
Incl. Tax: £44.21 Excl. Tax: £36.84
  • Pololu jrk 21v3 USB motor controller with included hardware soldered in (fully assembled).
  • Pololu jrk 21v3 USB motor controller with feedback, labelled top view.
  • Connecting a linear actuator with feedback to a jrk 21v3 motor controller.
  • A basic feedback system controlling a LEGO turret with the jrk 21v3.
  • The Input tab of the Jrk Configuration Utility
  • Pololu jrk 21v3 USB motor controller with dimensions.

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. Analogue 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.

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.

Note: A USB A to mini-B cable (not included) is required to connect this controller to a computer.

  • Simple bidirectional control of one DC brush motor.
  • 5 V to 28 V operating supply range.
  • 3 A maximum continuous current output (5 A peak).
  • Auto-detect baud rate range: 300 – 115,200 bps
  • Available fixed baud rates: 300 – 115,200 bps
  • Available PWM frequencies: 20 kHz, 5 kHz
  • Four communication or control options:
    1. USB interface for direct connection to a PC.
    2. Full-duplex, TTL-level asynchronous serial interface for direct connection to microcontrollers or other embedded controllers.
    3. Hobby radio control (RC) pulse width interface for direct connection to an RC receiver or RC servo controller.
    4. 0–5 V analogue voltage interface for direct connection to potentiometers and analogue joysticks.

  • Two closed-loop feedback options:
    1. 0–5 V analogue voltage.
    2. Frequency/tachometer digital input up to 2 MHz with 1 ms PID period.
      (Open-loop control with no feedback also available.)
  • Simple configuration and calibration over USB with free configuration program (Windows 8, Windows 7, Vista, and Windows XP compatible).
  • Configurable parameters include:
    • PID period and PID constants (feedback tuning parameters).
    • Maximum current.
    • Maximum duty cycle.
    • Maximum acceleration.
    • Error response.
    • Input calibration (learning) for analogue and RC control.
  • Optional CRC error detection eliminates communication errors caused by noise or software faults.
  • Reversed power protection.
  • Field-upgradeable firmware.
  • Optional feedback potentiometer disconnect detection.
  • Comprehensive user’s guide.

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