Create CmriBitsToBytes.jy

Example script to translate eight sensors as representing one byte (character, number) of information.  Use along with arduino-based CMRI nodes (see new help page)

jython/CmriBitsToBytes.jy

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+# Simple Event Listener to translate a group of 8 sensor "bits" into a single number
+# In this example, 8 bits are transformed into a number put in a memory
+
+# Jerry Grochow, copyright 2020
+
+# Based on listenerexample.py by: Bob Jacobsen, copyright 2004. Part of the JMRI distribution
+
+import java
+import java.beans
+import jmri
+
+# Define the listener
+class MyListener(java.beans.PropertyChangeListener):
+
+
+  def propertyChange(self, event):
+
+    # Create an array to translate sensor state (used as an index to the array) back into a bit stream:
+    #   sensor active = 2 so statetonum[2] is set to a 1; all other entries are set to 0
+    statetonum = [0, 0, 1, 0, 0]
+
+    #Sensor name array 
+    sensorName = ["CS5041", "CS5042", "CS5043", "CS5044", "CS5045", "CS5046", "CS5047", "CS5048"]
+
+
+    print "Change:",event.propertyName, " from", event.oldValue, "to", event.newValue
+    print " Source systemName: ", event.source.systemName, " userName: ", event.source.userName
+
+
+    #Get the memory where the result is to be stored
+    mem = memories.getMemory("IM5001")
+    if mem is None:
+      print "IM5001 does not exist"
+      return
+    mem.setComment("Speed Memory")
+
+
+    #Check that the sensors exist 
+    sXall = 0
+    sX = []
+    i = -1
+    for sName in sensorName:
+      i += 1
+      sX.append(sensors.getSensor(sName))
+      if sX[i] is None:
+        print sName, " does not exist"
+        sXall = 1
+      else:
+        sX[i].setComment("Speed bit " + str(i))
+    if sXall != 0:
+      return
+
+    #Create bits from states 
+    sBitVal = []   
+    for s in sX:   
+      sBitVal.append(statetonum[s.state])
+
+    print sBitVal
+    mem.value = sBitVal[0] + sBitVal[1] * 2 + sBitVal[2] * 4 + sBitVal[3] * 8 + sBitVal[4] * 16 + sBitVal[5] * 32 + sBitVal[6] * 64 + sBitVal[7] * 128
+    print "Memory speed set", mem.value
+    print " "
+
+    return 
+
+
+#Attach that listener to a particular turnout. The variable is used to remember the listener so we can remove it later
+lstnr5 = MyListener()
+sensors.getSensor("CS5002").addPropertyChangeListener(lstnr5)  #Listen on two sensors in this case
+sensors.getSensor("CS5003").addPropertyChangeListener(lstnr5)
+print  "Listener 5 set on CS5002 CS5003"
+
+#remove the listener
+#lstnr5.removePropertyChangeListener()