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"""
Onewire interface using w1 sysfs
"""
import os
import re
import sys
import time
class OnewireException(Exception):
pass
_sensors = {}
with open(os.path.join(os.path.realpath(os.path.dirname(__file__)), 'onewire-sensors.txt'), 'r') as sensors_file:
for line in sensors_file:
line = line.strip()
address, name = line.split(' ', 1)
_sensors[name] = address
def sensors():
return list(_sensors.keys())
class SensorFacade(object):
def __init__(self, addr, name):
self._addr = addr
self._name = name
def get_temperature(self):
addr = self._addr.replace('.', '-').lower()
path = '/sys/devices/w1_bus_master1/{0}/w1_slave'.format(addr)
with open(path, 'r') as w1_file:
w1_data = w1_file.read()
match = re.search(r'\st=(\d+)', w1_data)
temp = float(match.group(1)) / 1000
return temp
@property
def temperature(self):
for i in range(1,3):
try:
rv = self.get_temperature()
except Exception:
sys.excepthook(*sys.exc_info())
time.sleep(0.5)
continue
if rv > 65:
continue
if rv < -25:
continue
return rv
raise OnewireException("Bus error for %s" % self._name)
def sensor(name):
if name not in _sensors:
raise OnewireException('Don\'t know about sensor %s' % name)
return SensorFacade('%s' % _sensors[name], name)
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