

Pololu Jrk 21v3 USB Motor Controller with Feedback
The jrk 21v3 motor controller is a highly configurable brushed DC motor controller that supports four interface modes: USB, logic-level serial, analog voltage, and hobby radio control (RC). The controller can be used with feedback for closed-loop speed or position control, or it can be used without feedback as an open-loop speed control. The continuous output current is approximately 3 A in the recommended operating range of 8–28 V, with derated performance down to 5 V and transient protection to 40 V. The board ships with connectors included but not soldered in, allowing for custom installations.
![]() |
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 7, Vista, or Windows XP) allows easy calibration and configuration through the USB port.
Key improvements over competing products and earlier Pololu motor controllers with feedback include:
Note: A USB A to mini-B cable (not included) is required to connect this controller to a computer.
![]() |
![]() |
![]() |
Motor channels: | 1 |
---|---|
Operating voltage: | 5 – 28 V |
Continuous output current: | 3 A |
Peak output current: | 5 A |
Auto-detect baud rate range: | 300 – 115,200 bps |
Available fixed baud rates: | 300 – 115,200 bps |
Available PWM frequencies: | 20 kHz, 5 kHz |
Reverse voltage protection?: | Yes |
USB connector style: | USB Mini-B |
The jrk 21v3 is the smaller of two jrk motor controllers. For a higher-power version, see the jrk 12v12.
|
|
The jrk 21v3 is available in two versions: “fully assembled” with terminal blocks and 0.1" male header pins pre-installed (left picture above), and connector-free (right picture above). The connector-free version includes a 14×1 straight 0.100" breakaway male header strip and two 3.5mm, 2-pin terminal blocks, but these parts are not soldered to the board, which allows for custom installations.
The three mounting holes are intended for use with #2 screws (not included).
|
|
||||
|
|
![]() |
Micro Maestro 6-Channel USB Servo Controller (Assembled) |
![]() |
Pololu Qik 2s9v1 Dual Serial Motor Controller |
![]() |
Pololu Jrk 12v12 USB Motor Controller with Feedback |
Data sheet
Manufacturer BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
Responsible person BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
DC motor driver that allows you to control the movement of two drives using the I2C interface. Board with connectors for assembly. Pololu 5055
No product available!
The UX-52 panel brush motor speed controller is a versatile device with speed adjustment from 90 to 1400 rpm. It offers precise control of motors with an input voltage of 220VAC, featuring a solid construction and a convenient digital display.
No product available!
DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5059
No product available!
The power module together with the engine controller has been specially created for the Romi Chassis chassis. With its help, we will supply all components of our construction and we will be able to control the engines responsible for the movement of the chassis. Pololu 3543
The core of a small robot, either as an auxiliary controller atop a Raspberry Pi base or as a complete control solution on its own. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader. This version does not include any through-hole components or connectors, allowing for customized assembly or standalone use. Pololu 3118
KAmodMPC17C724 is a module with a double MP bridge bridge type MPC17C724. The system allows you to control two DC brush motors or one bipolar stepping motor. The controller operates at a voltage range of 2.7 - 5.5 V and can work with motors with power consumption up to 0.4 A.
HAT with TB6612FNG engine controller and PCA9685 PWM controller designed for Raspberry Pi minicomputers. The board is equipped with a 40-pin connector characteristic of Raspberry Pi, making it compatible with all minicomputers with this connector. Waveshare Motor Driver HAT
Module with 2-channel driver for DC motors L298P. The board is equipped with a Grove connector and communicates via the I2C interface. Seeed Studio 105020093
DC motor driver with voltage 4.5..28V and maximum continuous current of 2.6A. It has the ability to easily implement the feedback loop and numerous control interfaces. Polol 3142
DC motor driver module with two channels, dedicated to use in modeling. It can be controlled by an RC transmitter and uses the PPM signal. DFRobot DFR0513
DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5038
No product available!
Dual DC motor controller with voltage from 2.5 to 9.5V with 1A continuous current per channel. Has an embedded voltage regulator. Cytron Maker Drive
Single-channel DC motor driver with an operating voltage from 8 to 28 V and a continuous current up to 160 A. It can be controlled by an analog signal, PWM, UART, RC or by means of built-in buttons. Cytron MDS160A
No product available!
Dual motor controller that allows you to control two DC motors with 2.7-10.8V voltage and 1.2A continuous current per channel. Pololu 2130
No product available!
DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5044
No product available!
The pad for use with shallow Feather series contains two TB6612 chips that allow you to control DC motors or stepper motors. The I2C interface is used to communicate with the overlay. Adafruit 2927
Pololu Jrk 21v3 USB Motor Controller with Feedback