More Motor Control
The PmodHB3 H Bridge Driver is only capable driving of one motor.
Continuing on that theme the Arduino Motor Shield is functionally equivalent to two PmodHB3s.
The Motor Shield is based upon the L298 dual H bridge driver.
Above is a video of one connected to a Pioneer Kit driving two motors.
The schematic is just a doubled clone of the schematic used for the PmodHB3.
Likewise for the driving code.