Arduino Servo Potentiometer Serial

/*
Arduino Servo Test sketch
*/
#include <Servo.h>
Servo servoMain; // Define our Servo
int incomingByte = 0;
int servoPos;
static const int minAngle = 0;
static const int maxAngle = 180;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  servoMain.attach(14);
  if (Serial.available() > 0) {
    incomingByte = Serial.parseInt();
    if (incomingByte > -1){
      servoPos = constrain(map(incomingByte, 0,180,minAngle,maxAngle),minAngle,maxAngle);
      servoMain.write(servoPos);
      //servoMain.writeMicroseconds(incomingByte);
      Serial.println(incomingByte);
    }
  }
  servoMain.detach();
  // set servo to mid-point
}