Serial.println("Hello");

break;

case 'x':

stop();

break;

}

}

else stop();

}

}

PLL Control Mode

The Romeo also supports PLLPhase locked loop control mode.

https://www.dfrobot.com/wiki/index.php/Phase_locked_loop

Fig5: PLL Motor Control Pin Allocation Configuration

Sample Code：

//Standard DLL Speed control

int E1 = 4;

//M1 Speed Control

int E2 = 7;

//M2 Speed Control