code: func (d *Adaptor) ServoWrite(pin string, angle uint8) (err error) {
  	if !d.servo {
  		if err = d.littleWire.servoInit(); err != nil {
  			return
  		}
  		d.servo = true
  	}
  	return d.littleWire.servoUpdateLocation(angle, angle)
  }
docs: // ServoWrite writes the 0-180 degree val to the specified pin.