115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
"""Support for HTU21D temperature and humidity sensor."""
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from __future__ import annotations
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from datetime import timedelta
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from functools import partial
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import logging
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from i2csense.htu21d import HTU21D # pylint: disable=import-error
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import smbus
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import voluptuous as vol
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from homeassistant.components.sensor import (
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PLATFORM_SCHEMA,
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SensorEntity,
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SensorEntityDescription,
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)
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from homeassistant.const import (
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CONF_NAME,
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DEVICE_CLASS_HUMIDITY,
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DEVICE_CLASS_TEMPERATURE,
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PERCENTAGE,
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TEMP_CELSIUS,
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)
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import homeassistant.helpers.config_validation as cv
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from homeassistant.util import Throttle
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_LOGGER = logging.getLogger(__name__)
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CONF_I2C_BUS = "i2c_bus"
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DEFAULT_I2C_BUS = 1
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MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=5)
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DEFAULT_NAME = "HTU21D Sensor"
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SENSOR_TEMPERATURE = "temperature"
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SENSOR_HUMIDITY = "humidity"
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SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
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SensorEntityDescription(
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key=SENSOR_TEMPERATURE,
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native_unit_of_measurement=TEMP_CELSIUS,
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device_class=DEVICE_CLASS_TEMPERATURE,
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),
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SensorEntityDescription(
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key=SENSOR_HUMIDITY,
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native_unit_of_measurement=PERCENTAGE,
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device_class=DEVICE_CLASS_HUMIDITY,
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),
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)
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_I2C_BUS, default=DEFAULT_I2C_BUS): vol.Coerce(int),
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}
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)
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async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
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"""Set up the HTU21D sensor."""
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name = config.get(CONF_NAME)
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bus_number = config.get(CONF_I2C_BUS)
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bus = smbus.SMBus(config.get(CONF_I2C_BUS))
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sensor = await hass.async_add_executor_job(partial(HTU21D, bus, logger=_LOGGER))
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if not sensor.sample_ok:
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_LOGGER.error("HTU21D sensor not detected in bus %s", bus_number)
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return False
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sensor_handler = await hass.async_add_executor_job(HTU21DHandler, sensor)
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entities = [
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HTU21DSensor(sensor_handler, name, description) for description in SENSOR_TYPES
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]
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async_add_entities(entities)
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class HTU21DHandler:
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"""Implement HTU21D communication."""
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def __init__(self, sensor):
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"""Initialize the sensor handler."""
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self.sensor = sensor
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self.sensor.update()
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@Throttle(MIN_TIME_BETWEEN_UPDATES)
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def update(self):
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"""Read raw data and calculate temperature and humidity."""
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self.sensor.update()
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class HTU21DSensor(SensorEntity):
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"""Implementation of the HTU21D sensor."""
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def __init__(self, htu21d_client, name, description: SensorEntityDescription):
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"""Initialize the sensor."""
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self.entity_description = description
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self._client = htu21d_client
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self._attr_name = f"{name}_{description.key}"
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async def async_update(self):
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"""Get the latest data from the HTU21D sensor and update the state."""
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await self.hass.async_add_executor_job(self._client.update)
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if self._client.sensor.sample_ok:
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if self.entity_description.key == SENSOR_TEMPERATURE:
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value = round(self._client.sensor.temperature, 1)
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else:
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value = round(self._client.sensor.humidity, 1)
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self._attr_native_value = value
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else:
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_LOGGER.warning("Bad sample")
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