148 lines
4.6 KiB
Python
148 lines
4.6 KiB
Python
"""
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Support for Adafruit DHT temperature and humidity sensor.
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/sensor.dht/
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"""
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import logging
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from datetime import timedelta
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import voluptuous as vol
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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import homeassistant.helpers.config_validation as cv
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from homeassistant.const import (
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TEMP_FAHRENHEIT, CONF_NAME, CONF_MONITORED_CONDITIONS)
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from homeassistant.helpers.entity import Entity
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from homeassistant.util import Throttle
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from homeassistant.util.temperature import celsius_to_fahrenheit
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# Update this requirement to upstream as soon as it supports Python 3.
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REQUIREMENTS = ['https://github.com/adafruit/Adafruit_Python_DHT/archive/'
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'da8cddf7fb629c1ef4f046ca44f42523c9cf2d11.zip'
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'#Adafruit_DHT==1.3.0']
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_LOGGER = logging.getLogger(__name__)
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CONF_PIN = 'pin'
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CONF_SENSOR = 'sensor'
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DEFAULT_NAME = 'DHT Sensor'
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# DHT11 is able to deliver data once per second, DHT22 once every two
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MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=30)
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SENSOR_TEMPERATURE = 'temperature'
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SENSOR_HUMIDITY = 'humidity'
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SENSOR_TYPES = {
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SENSOR_TEMPERATURE: ['Temperature', None],
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SENSOR_HUMIDITY: ['Humidity', '%']
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}
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
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vol.Required(CONF_SENSOR): cv.string,
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vol.Required(CONF_PIN): cv.string,
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vol.Optional(CONF_MONITORED_CONDITIONS, default=[]):
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vol.All(cv.ensure_list, [vol.In(SENSOR_TYPES)]),
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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})
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def setup_platform(hass, config, add_devices, discovery_info=None):
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"""Set up the DHT sensor."""
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# pylint: disable=import-error
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import Adafruit_DHT
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SENSOR_TYPES[SENSOR_TEMPERATURE][1] = hass.config.units.temperature_unit
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available_sensors = {
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"DHT11": Adafruit_DHT.DHT11,
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"DHT22": Adafruit_DHT.DHT22,
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"AM2302": Adafruit_DHT.AM2302
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}
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sensor = available_sensors.get(config.get(CONF_SENSOR))
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pin = config.get(CONF_PIN)
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if not sensor:
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_LOGGER.error("DHT sensor type is not supported")
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return False
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data = DHTClient(Adafruit_DHT, sensor, pin)
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dev = []
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name = config.get(CONF_NAME)
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try:
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for variable in config[CONF_MONITORED_CONDITIONS]:
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dev.append(DHTSensor(
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data, variable, SENSOR_TYPES[variable][1], name))
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except KeyError:
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pass
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add_devices(dev)
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class DHTSensor(Entity):
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"""Implementation of the DHT sensor."""
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def __init__(self, dht_client, sensor_type, temp_unit, name):
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"""Initialize the sensor."""
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self.client_name = name
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self._name = SENSOR_TYPES[sensor_type][0]
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self.dht_client = dht_client
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self.temp_unit = temp_unit
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self.type = sensor_type
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self._state = None
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self._unit_of_measurement = SENSOR_TYPES[sensor_type][1]
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self.update()
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@property
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def name(self):
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"""Return the name of the sensor."""
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return '{} {}'.format(self.client_name, self._name)
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@property
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def state(self):
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"""Return the state of the sensor."""
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return self._state
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@property
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def unit_of_measurement(self):
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"""Return the unit of measurement of this entity, if any."""
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return self._unit_of_measurement
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def update(self):
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"""Get the latest data from the DHT and updates the states."""
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self.dht_client.update()
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data = self.dht_client.data
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if self.type == SENSOR_TEMPERATURE:
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temperature = round(data[SENSOR_TEMPERATURE], 1)
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if (temperature >= -20) and (temperature < 80):
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self._state = temperature
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if self.temp_unit == TEMP_FAHRENHEIT:
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self._state = round(celsius_to_fahrenheit(temperature), 1)
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elif self.type == SENSOR_HUMIDITY:
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humidity = round(data[SENSOR_HUMIDITY], 1)
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if (humidity >= 0) and (humidity <= 100):
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self._state = humidity
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class DHTClient(object):
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"""Get the latest data from the DHT sensor."""
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def __init__(self, adafruit_dht, sensor, pin):
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"""Initialize the sensor."""
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self.adafruit_dht = adafruit_dht
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self.sensor = sensor
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self.pin = pin
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self.data = dict()
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@Throttle(MIN_TIME_BETWEEN_UPDATES)
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def update(self):
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"""Get the latest data the DHT sensor."""
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humidity, temperature = self.adafruit_dht.read_retry(
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self.sensor, self.pin)
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if temperature:
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self.data[SENSOR_TEMPERATURE] = temperature
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if humidity:
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self.data[SENSOR_HUMIDITY] = humidity
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