add arduino sensor platform

homeassistant/components/sensor/arduino.py

@@ -0,0 +1,87 @@
+"""
+homeassistant.components.sensor.arduino
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Support for getting information from Arduino pins. Only analog pins are
+supported.
+
+Configuration:
+
+sensor:
+  platform: arduino
+  pins:
+    7:
+      name: Door switch
+      type: analog
+    0:
+      name: Brightness
+      type: analog
+
+Variables:
+
+pins
+*Required
+An array specifying the digital pins to use on the Arduino board.
+
+These are the variables for the pins array:
+
+name
+*Required
+The name for the pin that will be used in the frontend.
+
+type
+*Required
+The type of the pin: 'analog'.
+"""
+import logging
+
+import homeassistant.components.arduino as arduino
+from homeassistant.helpers.entity import Entity
+from homeassistant.const import DEVICE_DEFAULT_NAME
+
+DEPENDENCIES = ['arduino']
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """ Sets up the Arduino platform. """
+
+    # Verify that Arduino board is present
+    if arduino.BOARD is None:
+        _LOGGER.error('A connection has not been made to the Arduino board.')
+        return False
+
+    sensors = []
+    pins = config.get('pins')
+    for pinnum, pin in pins.items():
+        if pin.get('name'):
+            sensors.append(ArduinoSensor(pin.get('name'),
+                                         pinnum,
+                                         'analog'))
+    add_devices(sensors)
+
+
+class ArduinoSensor(Entity):
+    """ Represents an Arduino Sensor. """
+    def __init__(self, name, pin, pin_type):
+        self._pin = pin
+        self._name = name or DEVICE_DEFAULT_NAME
+        self.pin_type = pin_type
+        self.direction = 'in'
+        self._value = None
+
+        arduino.BOARD.set_mode(self._pin, self.direction, self.pin_type)
+
+    @property
+    def state(self):
+        """ Returns the state of the sensor. """
+        return self._value
+
+    @property
+    def name(self):
+        """ Get the name of the sensor. """
+        return self._name
+
+    def update(self):
+        """ Get the latest value from the pin. """
+        self._value = arduino.BOARD.get_analog_inputs()[self._pin][1]