#include <Servo.h>

Servo engine1;
int incomingByte =0;
int pos_engine1 = 0;
int mounting_pount = 21; //here the engine starts turning
void setup()
{
  engine1.attach(8);
  Serial.begin(9600);
}

void loop()
{

  if (Serial.available() > 0)
  {
    incomingByte = Serial.read();
    Serial.println(incomingByte);

    if (incomingByte == 119 && pos_engine1 < 180)
    {
      if (pos_engine1 < 21)
      {
        pos_engine1 = 21;
      }
      else
      {
      pos_engine1 ++;
      }
    }

      else if (incomingByte == 115 && pos_engine1 > 0 && !pos_engine1 > 21)
    {

      pos_engine1 --;
    }

  }
   engine1.write(pos_engine1);
   Serial.println(pos_engine1);
}