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 installed as shown (no soldering required).
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.
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.
|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 straight 0.1″ 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).