93 lines
No EOL
2.7 KiB
Python
93 lines
No EOL
2.7 KiB
Python
""" Support for DS18B20 One Wire Sensors"""
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from homeassistant.helpers.entity import Entity
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from homeassistant.const import TEMP_CELCIUS, TEMP_FAHRENHEIT
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from glob import glob
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import os
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import time
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import logging
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BASE_DIR = '/sys/bus/w1/devices/'
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DEVICE_FOLDERS = glob(os.path.join(BASE_DIR, '28*'))
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SENSOR_IDS = [os.path.split(device_folder)[1] for device_folder in DEVICE_FOLDERS]
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DEVICE_FILES = [os.path.join(device_folder, 'w1_slave') for device_folder in DEVICE_FOLDERS]
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_LOGGER = logging.getLogger(__name__)
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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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""" Sets up the one wire Sensors"""
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# TODO check if kernel modules are loaded
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# TODO implment config fore the name, but also default solution
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if DEVICE_FILES == []:
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_LOGGER.error('No onewire sensor found')
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return
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devs = []
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names = []
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try:
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## only one name given
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if type(config['names']) == str:
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names = [names]
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## map names and sensors in given order
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elif type(config['names']) == list:
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names = config['names']
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## map names with ids
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elif type(config['names']) == dict:
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for sensor_id in SENSOR_IDS:
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names.append(config['names'][sensor_id])
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except KeyError:
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## use id as name
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if not config['names']:
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for sensor_id in SENSOR_IDS:
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names.append(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, TEMP_CELCIUS))
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add_devices(devs)
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class OneWire(Entity):
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""" A Dallas 1 Wire Sensor"""
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def __init__(self, name, device_file, unit_of_measurement):
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self._name = name
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self._device_file = device_file
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self._unit_of_measurement = unit_of_measurement
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def _read_temp_raw(self):
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f = open(self._device_file, 'r')
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lines = f.readlines()
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f.close()
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return lines
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@property
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def should_poll(self):
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return True
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@property
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def name(self):
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return self._name
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@property
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def state(self):
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""" return temperature in unit_of_measurement"""
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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 = float(temp_string) / 1000.0
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if self._unit_of_measurement == TEMP_FAHRENHEIT:
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temp = temp * 9.0 / 5.0 + 32.0
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return temp
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@property
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def unit_of_measurement(self):
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return self._unit_of_measurement
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