Pll Control Mode - DFRobot DFRduino Romeo-All in one Controller V1.1 Manual

if(val != -1)
{
switch(val)
{
case 'w'://Move Forward
advance (255,255);
break;
case 's'://Move Backward
back_off (255,255);
break;
case 'a'://Turn Left
turn_L (100,100);
break;
case 'd'://Turn Right
turn_R (100,100);
break;
case 'z':
Serial.println("Hello");
break;
case 'x':
stop();
break;
}
}
else stop();
}
}
PLL Control Mode
The Romeo also supports
//move forward in max speed
//move back in max speed
PLLPhase locked loop control mode.