Add envmon code

1 files changed, 46 insertions, 0 deletions

diff --git a/envmon/onewire-ow.py b/envmon/onewire-ow.py
new file mode 100644
index 0000000..6e3420b
--- /dev/null
+++ b/envmon/onewire-ow.py
@@ -0,0 +1,46 @@
+"""
+Onewire interface using owserver
+"""
+
+import os
+import ow
+
+class OnewireException(Exception):
+	pass
+
+ow.init('127.0.0.1:4304')
+
+_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, sensor, name):
+		self._sensor = sensor
+		self._name = name
+
+	def __getattr__(self, name):
+		return getattr(self._sensor, name)
+
+	@property
+	def temperature(self):
+		for i in range(1,3):
+			rv = float(self._sensor.temperature)
+			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(ow.Sensor('/%s' % _sensors[name]), name)