text: """Support for MySensors binary sensors."""
  from homeassistant.components import mysensors
  from homeassistant.components.binary_sensor import (
      DEVICE_CLASSES, DOMAIN, BinarySensorDevice)
  from homeassistant.const import STATE_ON
  
  SENSORS = {
      'S_DOOR': 'door',
      'S_MOTION': 'motion',
      'S_SMOKE': 'smoke',
      'S_SPRINKLER': 'safety',
      'S_WATER_LEAK': 'safety',
      'S_SOUND': 'sound',
      'S_VIBRATION': 'vibration',
      'S_MOISTURE': 'moisture',
  }
  
  
  async def async_setup_platform(
          hass, config, async_add_entities, discovery_info=None):
      """Set up the mysensors platform for binary sensors."""
      mysensors.setup_mysensors_platform(
          hass, DOMAIN, discovery_info, MySensorsBinarySensor,
          async_add_entities=async_add_entities)
  
  
  class MySensorsBinarySensor(
          mysensors.device.MySensorsEntity, BinarySensorDevice):
      """Representation of a MySensors Binary Sensor child node."""
  
      @property
      def is_on(self):
          """Return True if the binary sensor is on."""
          return self._values.get(self.value_type) == STATE_ON
  
      @property
      def device_class(self):
          """Return the class of this sensor, from DEVICE_CLASSES."""
          pres = self.gateway.const.Presentation
          device_class = SENSORS.get(pres(self.child_type).name)
          if device_class in DEVICE_CLASSES:
              return device_class
          return None
  