adding sensehat plugin (#4775)

* adding sensehat plugin

* added

* fix PR

* requirement updated

* Update sensehat.py

.coveragerc

@@ -296,6 +296,7 @@ omit =
     homeassistant/components/sensor/pvoutput.py
     homeassistant/components/sensor/sabnzbd.py
     homeassistant/components/sensor/scrape.py
+    homeassistant/components/sensor/sensehat.py
     homeassistant/components/sensor/serial_pm.py
     homeassistant/components/sensor/snmp.py
     homeassistant/components/sensor/sonarr.py

homeassistant/components/sensor/sensehat.py

@@ -0,0 +1,134 @@
+"""
+Support for Sense HAT sensors.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/sensor.sensehat
+"""
+import os
+import logging
+from datetime import timedelta
+
+import voluptuous as vol
+
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import (TEMP_CELSIUS, CONF_DISPLAY_OPTIONS, CONF_NAME)
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import Entity
+from homeassistant.util import Throttle
+
+REQUIREMENTS = ['sense-hat==2.2.0']
+
+_LOGGER = logging.getLogger(__name__)
+
+DEFAULT_NAME = 'sensehat'
+
+MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=60)
+
+SENSOR_TYPES = {
+    'temperature': ['temperature', TEMP_CELSIUS],
+    'humidity': ['humidity', "%"],
+    'pressure': ['pressure', "mb"],
+}
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_DISPLAY_OPTIONS, default=SENSOR_TYPES):
+        [vol.In(SENSOR_TYPES)],
+    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+})
+
+
+def get_cpu_temp():
+    """Get CPU temperature."""
+    res = os.popen("vcgencmd measure_temp").readline()
+    t_cpu = float(res.replace("temp=", "").replace("'C\n", ""))
+    return t_cpu
+
+
+def get_average(temp_base):
+    """Use moving average to get better readings."""
+    if not hasattr(get_average, "temp"):
+        get_average.temp = [temp_base, temp_base, temp_base]
+    get_average.temp[2] = get_average.temp[1]
+    get_average.temp[1] = get_average.temp[0]
+    get_average.temp[0] = temp_base
+    temp_avg = (get_average.temp[0]+get_average.temp[1]+get_average.temp[2])/3
+    return temp_avg
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Setup the sensor platform."""
+    data = SenseHatData()
+    dev = []
+
+    for variable in config[CONF_DISPLAY_OPTIONS]:
+        dev.append(SenseHatSensor(data, variable))
+
+    add_devices(dev)
+
+
+class SenseHatSensor(Entity):
+    """Representation of a sensehat sensor."""
+
+    def __init__(self, data, sensor_types):
+        """Initialize the sensor."""
+        self.data = data
+        self._name = SENSOR_TYPES[sensor_types][0]
+        self._unit_of_measurement = SENSOR_TYPES[sensor_types][1]
+        self.type = sensor_types
+        self._state = None
+        """updating data."""
+        self.update()
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit the value is expressed in."""
+        return self._unit_of_measurement
+
+    def update(self):
+        """Get the latest data and updates the states."""
+        self.data.update()
+        if not self.data.humidity:
+            _LOGGER.error("Don't receive data!")
+            return
+
+        if self.type == 'temperature':
+            self._state = self.data.temperature
+        if self.type == 'humidity':
+            self._state = self.data.humidity
+        if self.type == 'pressure':
+            self._state = self.data.pressure
+
+
+class SenseHatData(object):
+    """Get the latest data and update."""
+
+    def __init__(self):
+        """Initialize the data object."""
+        self.temperature = None
+        self.humidity = None
+        self.pressure = None
+
+    @Throttle(MIN_TIME_BETWEEN_UPDATES)
+    def update(self):
+        """Get the latest data from sensehat."""
+        from sense_hat import SenseHat
+        sense = SenseHat()
+        temp_from_h = sense.get_temperature_from_humidity()
+        temp_from_p = sense.get_temperature_from_pressure()
+        t_cpu = get_cpu_temp()
+        t_total = (temp_from_h+temp_from_p)/2
+        t_correct = t_total - ((t_cpu-t_total)/1.5)
+        t_correct = get_average(t_correct)
+        self.temperature = t_correct
+        self.humidity = sense.get_humidity()
+        self.pressure = sense.get_pressure()

requirements_all.txt

@@ -521,6 +521,9 @@ scsgate==0.1.0
 # homeassistant.components.notify.sendgrid
 sendgrid==3.6.3
 
+# homeassistant.components.sensor.sensehat
+sense-hat==2.2.0
+
 # homeassistant.components.media_player.aquostv
 sharp-aquos-rc==0.2