Added a switch to control beamers from acer

.coveragerc

@@ -164,6 +164,7 @@ omit =
     homeassistant/components/sensor/twitch.py
     homeassistant/components/sensor/uber.py
     homeassistant/components/sensor/worldclock.py
+    homeassistant/components/switch/acer_projector.py
     homeassistant/components/switch/arest.py
     homeassistant/components/switch/dlink.py
     homeassistant/components/switch/edimax.py

homeassistant/components/switch/acer_projector.py

@@ -0,0 +1,145 @@
+"""
+Use serial protocol of acer projector to obtain state of the projector.
+
+This component allows to control almost all projectors from acer using
+their RS232 serial communication protocol.
+"""
+
+import logging
+import re
+
+from homeassistant.components.switch import SwitchDevice
+from homeassistant.const import (STATE_ON, STATE_OFF, STATE_UNKNOWN,
+                                 CONF_NAME, CONF_FILENAME)
+
+LAMP_HOURS = 'Lamp Hours'
+INPUT_SOURCE = 'Input Source'
+ECO_MODE = 'ECO Mode'
+MODEL = 'Model'
+LAMP = 'Lamp'
+
+# Commands known to the projector
+CMD_DICT = {LAMP: '* 0 Lamp ?\r',
+            LAMP_HOURS: '* 0 Lamp\r',
+            INPUT_SOURCE: '* 0 Src ?\r',
+            ECO_MODE: '* 0 IR 052\r',
+            MODEL: '* 0 IR 035\r',
+            STATE_ON: '* 0 IR 001\r',
+            STATE_OFF: '* 0 IR 002\r'}
+
+_LOGGER = logging.getLogger(__name__)
+REQUIREMENTS = ['pyserial<=3.0']
+
+ICON = 'mdi:projector'
+
+
+# pylint: disable=unused-argument
+def setup_platform(hass, config, add_devices_callback, discovery_info=None):
+    """Connect with serial port and return Acer Projector."""
+    serial_port = config.get(CONF_FILENAME, None)
+    name = config.get(CONF_NAME, 'Projector')
+    timeout = config.get('timeout', 1)
+    write_timeout = config.get('write_timeout', 1)
+
+    if not serial_port:
+        _LOGGER.error('Missing path of serial device')
+        return
+
+    devices = []
+    devices.append(AcerSwitch(serial_port, name, timeout, write_timeout))
+    add_devices_callback(devices)
+
+
+class AcerSwitch(SwitchDevice):
+    """Represents an Acer Projector as an switch."""
+
+    def __init__(self, serial_port, name='Projector',
+                 timeout=1, write_timeout=1, **kwargs):
+        """Init of the Acer projector."""
+        import serial
+        self.ser = serial.Serial(port=serial_port, timeout=timeout,
+                                 write_timeout=write_timeout, **kwargs)
+        self._serial_port = serial_port
+        self._name = name
+        self._state = STATE_UNKNOWN
+        self._attributes = {
+            LAMP_HOURS: STATE_UNKNOWN,
+            INPUT_SOURCE: STATE_UNKNOWN,
+            ECO_MODE: STATE_UNKNOWN,
+        }
+        self.update()
+
+    def _write_read(self, msg):
+        """Write to the projector and read the return."""
+        import serial
+        ret = ""
+        # Sometimes the projector won't answer for no reason,
+        # or the projector was disconnected during runtime.
+        # Thisway the projector can be reconnected and will still
+        # work
+        try:
+            if not self.ser.is_open:
+                self.ser.open()
+            msg = msg.encode('utf-8')
+            self.ser.write(msg)
+            # size is an experience value there is no real limit.
+            # AFAIK there is no limit and no end character so
+            # we will usually need to wait for timeout
+            ret = self.ser.read_until(size=20).decode('utf-8')
+        except serial.SerialException:
+            _LOGGER.error('Problem comunicating with %s', self._serial_port)
+        self.ser.close()
+        return ret
+
+    def _write_read_format(self, msg):
+        """Write msg, obtain awnser and format output."""
+        # awnsers are formated as ***\rawnser\r***
+        awns = self._write_read(msg)
+        match = re.search(r'\r(.+)\r', awns)
+        if match:
+            return match.group(1)
+        return STATE_UNKNOWN
+
+    @property
+    def name(self):
+        """Return name of the projector."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the current state of the projector."""
+        return self._state
+
+    @property
+    def state_attributes(self):
+        """Return state attributes."""
+        return self._attributes
+
+    def update(self):
+        """Get the latest state from the projector."""
+        msg = CMD_DICT[LAMP]
+        awns = self._write_read_format(msg)
+        if awns == 'Lamp 1':
+            self._state = STATE_ON
+        elif awns == 'Lamp 0':
+            self._state = STATE_OFF
+        else:
+            self._state = STATE_UNKNOWN
+
+        for key in self._attributes.keys():
+            msg = CMD_DICT.get(key, None)
+            if msg:
+                awns = self._write_read_format(msg)
+                self._attributes[key] = awns
+
+    def turn_on(self):
+        """Turn the projector on."""
+        msg = CMD_DICT[STATE_ON]
+        self._write_read(msg)
+        self._state = STATE_ON
+
+    def turn_off(self):
+        """Turn the projector off."""
+        msg = CMD_DICT[STATE_OFF]
+        self._write_read(msg)
+        self._state = STATE_OFF

requirements_all.txt

@@ -221,6 +221,9 @@ pynx584==0.2
 # homeassistant.components.sensor.openweathermap
 pyowm==2.3.1
 
+# homeassistant.components.switch.acer_projector
+pyserial<=3.0
+
 # homeassistant.components.device_tracker.snmp
 pysnmp==4.2.5