This board is a compact (0.5″ × 0.9″) breakout board for ST’s L3GD20 three-axis digital-output gyroscope; we therefore recommend careful reading of theL3GD20 datasheet (2MB pdf) before using this product.
This is a breakout board for TI’s DRV8824 microstepping bipolar stepper motor driver, a lower-current version of the DRV8825. It can deliver up to 0.75 A per coil without a heat sink (it is rated for up to 1.2 A per coil with sufficient additional cooling
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.