code: func (f *Adaptor) ServoWrite(pin string, angle byte) (err error) {
  	p, err := strconv.Atoi(pin)
  	if err != nil {
  		return err
  	}
  
  	if f.Board.Pins()[p].Mode != client.Servo {
  		err = f.Board.SetPinMode(p, client.Servo)
  		if err != nil {
  			return err
  		}
  	}
  	err = f.Board.AnalogWrite(p, int(angle))
  	return
  }
docs: // ServoWrite writes the 0-180 degree angle to the specified pin.