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

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).
Dimensions
Size: 1.35" x 1.35" x 0.5"
Weight: 0.23 oz
General 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
Notes:

1 Autodetects baud rates between 300 and 115,200 bps, or can be set to any fixed baud rate in this range.
2 Current readings are converted to a digital number from 0-255.
3 In RC mode, the pulses can be as low as 2V.