mirror of
https://github.com/home-assistant/core
synced 2024-09-03 08:14:07 +02:00
178 lines
5.5 KiB
Python
178 lines
5.5 KiB
Python
"""Support for Adafruit DHT temperature and humidity sensor."""
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from datetime import timedelta
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import logging
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import Adafruit_DHT # pylint: disable=import-error
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import voluptuous as vol
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.const import (
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CONF_MONITORED_CONDITIONS,
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CONF_NAME,
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TEMP_FAHRENHEIT,
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UNIT_PERCENTAGE,
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)
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import homeassistant.helpers.config_validation as cv
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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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_LOGGER = logging.getLogger(__name__)
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CONF_PIN = "pin"
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CONF_SENSOR = "sensor"
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CONF_HUMIDITY_OFFSET = "humidity_offset"
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CONF_TEMPERATURE_OFFSET = "temperature_offset"
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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", UNIT_PERCENTAGE],
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}
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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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=[]): vol.All(
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cv.ensure_list, [vol.In(SENSOR_TYPES)]
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),
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_TEMPERATURE_OFFSET, default=0): vol.All(
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vol.Coerce(float), vol.Range(min=-100, max=100)
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),
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vol.Optional(CONF_HUMIDITY_OFFSET, default=0): vol.All(
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vol.Coerce(float), vol.Range(min=-100, max=100)
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),
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}
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)
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def setup_platform(hass, config, add_entities, discovery_info=None):
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"""Set up the DHT sensor."""
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SENSOR_TYPES[SENSOR_TEMPERATURE][1] = hass.config.units.temperature_unit
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available_sensors = {
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"AM2302": Adafruit_DHT.AM2302,
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"DHT11": Adafruit_DHT.DHT11,
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"DHT22": Adafruit_DHT.DHT22,
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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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temperature_offset = config.get(CONF_TEMPERATURE_OFFSET)
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humidity_offset = config.get(CONF_HUMIDITY_OFFSET)
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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(
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DHTSensor(
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data,
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variable,
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SENSOR_TYPES[variable][1],
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name,
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temperature_offset,
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humidity_offset,
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)
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)
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except KeyError:
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pass
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add_entities(dev, True)
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class DHTSensor(Entity):
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"""Implementation of the DHT sensor."""
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def __init__(
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self,
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dht_client,
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sensor_type,
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temp_unit,
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name,
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temperature_offset,
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humidity_offset,
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):
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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.temperature_offset = temperature_offset
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self.humidity_offset = humidity_offset
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self._state = None
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self._unit_of_measurement = SENSOR_TYPES[sensor_type][1]
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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 f"{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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temperature_offset = self.temperature_offset
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humidity_offset = self.humidity_offset
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data = self.dht_client.data
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if self.type == SENSOR_TEMPERATURE and SENSOR_TEMPERATURE in data:
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temperature = data[SENSOR_TEMPERATURE]
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_LOGGER.debug(
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"Temperature %.1f \u00b0C + offset %.1f",
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temperature,
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temperature_offset,
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)
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if -20 <= temperature < 80:
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self._state = round(temperature + temperature_offset, 1)
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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 and SENSOR_HUMIDITY in data:
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humidity = data[SENSOR_HUMIDITY]
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_LOGGER.debug("Humidity %.1f%% + offset %.1f", humidity, humidity_offset)
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if 0 <= humidity <= 100:
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self._state = round(humidity + humidity_offset, 1)
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class DHTClient:
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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(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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