add switching_sensor

frappy_psi/switching_sensor.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""virtual sensor switching between two others depending on range"""
+
+from frappy.core import ERROR, Attached, BoolType, Parameter, Readable, TupleOf, EnumType, FloatRange
+
+
+class Sensor(Readable):
+    upper = Attached()
+    lower = Attached()
+
+    switch_range = Parameter('switching range', datatype=TupleOf(FloatRange(), FloatRange()), readonly=False, default=(0, 0))
+    used_sensor = Parameter('sensor to use', EnumType(lower=0, upper=1), readonly=False, default=0)
+    value = Parameter(datatype=FloatRange(unit='K'))
+    pollinterval = Parameter(export=False)
+    status = Parameter(default=(Readable.Status.ERROR, 'unintialized'))
+
+    def initModule(self):
+        super().initModule()
+        self.rawsensor.registerCallbacks(self)
+
+    def update_value(self, value):
+        src = self.upper if self.used_sensor == 'upper' else self.lower
+        try:
+            self.value = src.value
+            self.status = src.status
+        except Exception as e:
+            self.status = ERROR, repr(e)
+
+    def update_status(self, value):
+        self.update_value(None)
+
+    def read_value(self):
+        src = self.upper if self.used_sensor == 'upper' else self.lower
+        return src.read_value()
+
+    def read_status(self):
+        src = self.upper if self.used_sensor == 'upper' else self.lower
+        return src.read_status()