143 lines
4.8 KiB
Python
143 lines
4.8 KiB
Python
"""
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Support for 1-Wire temperature sensors.
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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.onewire/
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"""
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import os
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import time
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import logging
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from glob import glob
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import voluptuous as vol
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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.const import TEMP_CELSIUS
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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_LOGGER = logging.getLogger(__name__)
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CONF_MOUNT_DIR = 'mount_dir'
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CONF_NAMES = 'names'
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DEFAULT_MOUNT_DIR = '/sys/bus/w1/devices/'
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DEVICE_FAMILIES = ('10', '22', '28', '3B', '42')
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
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vol.Optional(CONF_NAMES): {cv.string: cv.string},
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vol.Optional(CONF_MOUNT_DIR, default=DEFAULT_MOUNT_DIR): cv.string,
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})
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# pylint: disable=unused-argument
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def setup_platform(hass, config, add_devices, discovery_info=None):
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"""Set up the one wire Sensors."""
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base_dir = config.get(CONF_MOUNT_DIR)
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sensor_ids = []
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device_files = []
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if base_dir == DEFAULT_MOUNT_DIR:
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for device_family in DEVICE_FAMILIES:
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for device_folder in glob(os.path.join(base_dir, device_family +
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'[.-]*')):
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sensor_ids.append(os.path.split(device_folder)[1])
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device_files.append(os.path.join(device_folder, 'w1_slave'))
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else:
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for family_file_path in glob(os.path.join(base_dir, '*', 'family')):
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family_file = open(family_file_path, "r")
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family = family_file.read()
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if family in DEVICE_FAMILIES:
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sensor_id = os.path.split(
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os.path.split(family_file_path)[0])[1]
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sensor_ids.append(sensor_id)
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device_files.append(os.path.join(
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os.path.split(family_file_path)[0], 'temperature'))
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if device_files == []:
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_LOGGER.error("No onewire sensor found. Check if dtoverlay=w1-gpio "
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"is in your /boot/config.txt. "
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"Check the mount_dir parameter if it's defined")
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return
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devs = []
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names = sensor_ids
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for key in config.keys():
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if key == 'names':
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# Only one name given
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if isinstance(config['names'], str):
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names = [config['names']]
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# Map names and sensors in given order
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elif isinstance(config['names'], list):
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names = config['names']
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# Map names to ids.
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elif isinstance(config['names'], dict):
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names = []
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for sensor_id in sensor_ids:
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names.append(config['names'].get(sensor_id, sensor_id))
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for device_file, name in zip(device_files, names):
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devs.append(OneWire(name, device_file))
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add_devices(devs, True)
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class OneWire(Entity):
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"""Implementation of an One wire Sensor."""
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def __init__(self, name, device_file):
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"""Initialize the sensor."""
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self._name = name
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self._device_file = device_file
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self._state = None
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def _read_temp_raw(self):
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"""Read the temperature as it is returned by the sensor."""
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ds_device_file = open(self._device_file, 'r')
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lines = ds_device_file.readlines()
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ds_device_file.close()
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return lines
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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 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 the value is expressed in."""
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return TEMP_CELSIUS
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def update(self):
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"""Get the latest data from the device."""
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temp = -99
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if self._device_file.startswith(DEFAULT_MOUNT_DIR):
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lines = self._read_temp_raw()
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while lines[0].strip()[-3:] != 'YES':
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time.sleep(0.2)
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lines = self._read_temp_raw()
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equals_pos = lines[1].find('t=')
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if equals_pos != -1:
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temp_string = lines[1][equals_pos+2:]
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temp = round(float(temp_string) / 1000.0, 1)
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else:
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try:
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ds_device_file = open(self._device_file, 'r')
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temp_read = ds_device_file.readlines()
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ds_device_file.close()
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if len(temp_read) == 1:
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temp = round(float(temp_read[0]), 1)
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except ValueError:
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_LOGGER.warning("Invalid temperature value read from %s",
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self._device_file)
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except FileNotFoundError:
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_LOGGER.warning(
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"Cannot read from sensor: %s", self._device_file)
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if temp < -55 or temp > 125:
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return
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self._state = temp
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