ServoSerialControlled.ino

#include <Servo.h> 
 
Servo myservo;  // create servo object to control a servo 
                // a maximum of eight servo objects can be created 
 
int pos = 0;    // variable to store the servo position 
int incomingByte = 0;   // for incoming serial data

void setup() 
{
  Serial.begin(9600); 
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
  myservo.write(pos);
} 
 
 
void loop() 
{ 
  
  if(Serial.available() > 0)
  {
    // read the incoming byte:
    incomingByte = Serial.read();
    if(incomingByte == 119) // 'w'
      pos += 45;
    else if(incomingByte == 115) // 's'
      pos -= 45;
    myservo.write(pos);
    delay(15);
  }
}