Zumo Motors (ZumoMotors.h)

The ZumoMotors library provides functions for PWM-based speed (and direction) control of the two motors on the Zumo with the onboard DRV8835 dual motor driver. On Arduinos with ATmega328P, ATmega168, and ATmega32U4 microcontrollers (which include the Leonardo, Uno, and most older Arduinos), the motor control functions use hardware PWM outputs from Timer1 to generate pulse width modulation at a 20 kHz frequency. If you accidentally soldered a motor to the Zumo Shield backwards (opposite the orientation indicated in the assembly instructions), you can simply call flipLeftMotor(true) and/or flipRightMotor(true) to make the motors behave consistently with the directions in your code. This library comes with an example sketch demonstrating its use. More info in https://github.com/pololu/zumo-shield