#include <Servo.h>

Servo servo1;
Servo servo2;

void setup() {
  servo1.attach(9);   // attach servo1 to digital pin 9
  servo2.attach(8);  // attach servo2 to digital pin 10
}

void loop() {
  if (Serial.available() > 0) {
    char command = Serial.read(); // read character from serial port
    if (command == 'm') { // move servo1 to 90 degrees
      servo1.write(90);
    } else if (command == 'n') { // move servo2 to 90 degrees
      servo2.write(90);
    } else if (command == 'o') { // move servo1 and servo2 to 0 degrees
      servo1.write(0);
      servo2.write(0);
    } else if (command == 'p') { // move servo1 and servo2 to 180 degrees
      servo1.write(180);
      servo2.write(180);
    }
  }
}