code: func (g *Driver) SetServo(srvo Servo, us uint16) error {
  	return g.writeBytes([]byte{
  		goPiGo3Address,
  		SET_SERVO,
  		byte(srvo),
  		byte((us >> 8) & 0xFF),
  		byte(us & 0xFF),
  	})
  }
docs: // SetServo sets a servo's position in microseconds (0-16666).