code: def read_proximity(self, timeout_sec=1):
          
          # Ask for a proximity measurement and wait for the response.
          self._device.write8(VCNL40xx_COMMAND, VCNL40xx_MEASUREPROXIMITY)
          self._wait_response(VCNL40xx_PROXIMITYREADY, timeout_sec)
          # Return the proximity response.
          return self._device.readU16BE(VCNL40xx_PROXIMITYDATA)
docs: Read the sensor proximity and return it as an unsigned 16-bit value.
          The larger the value the closer an object is to the sensor.