MSA-1713: This will toggle lights on/off with a door sensor. When the contact sensor detects the door is opened, the selected lights will toggle based on the master switch status. For example, if master is ON, the lights will turn OFF. When the master is OFF, these will turn ON.

smartapps/garrettgeier/toggle-lights-on-off-using-door-sensor.src/toggle-lights-on-off-using-door-sensor.groovy

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+/**
+ *  Door Sensor Light Toggle
+ *
+ *  Copyright 2017 Garrett Geier
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ *  in compliance with the License. You may obtain a copy of the License at:
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ *  on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
+ *  for the specific language governing permissions and limitations under the License.
+ *
+ */
+definition(
+    name: "Toggle lights on/off using Door Sensor",
+    namespace: "GarrettGeier",
+    author: "Garrett Geier",
+    description: "Toggle lights on/off with a door sensor. When the door is opened, the lights will toggle based on the master switch.",
+    category: "Convenience",
+    iconUrl: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience.png",
+    iconX2Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png",
+    iconX3Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png")
+
+//main screen options
+preferences
+{
+     //choose the door/contact sensor here.
+	section("When this door is opened")
+    {
+		input "doorToggler", "capability.contactSensor", title: "Select Door Sensor", required: true, multiple: false
+    }
+    
+    // this is the master switch. If this switch is ON, then the lights will turn OFF when the door is opened.
+    // If this switch is OFF, then the lights will turn ON when the door is opened.
+    // Don't care about if the door is closed, this is designed for a normal door which will eventually be shut. :)
+    section("Select the Master switch")
+    {
+    	input "masterToggle", "capability.switch", title: "Master switch", required: true, multiple: false
+    }
+    
+    //based on the master switch, these will turn on or off.
+    section("Stuff you want to turn on/off")
+    {
+	    input "switchesToToggle", "capability.switch", title: "If master is ON, these will turn OFF. When the master is OFF, these will turn ON.", required: true, multiple: true
+	}
+}
+
+//required
+def installed()
+{
+	initialize()
+}
+
+//required
+def updated()
+{
+	unsubscribe()
+	initialize()
+}
+
+// the event we care about, when the door is opened.
+// see http://docs.smartthings.com/en/latest/capabilities-reference.html#contactsensor for device capabilities
+def initialize()
+{
+    subscribe(doorToggler, "contact.open", toggleSwitches)
+}
+
+def toggleSwitches(evt)
+{
+	//log.debug "$evt.value"
+  
+	if (evt.value == "open" && masterToggle.currentSwitch == "off")
+    {
+        //log.debug "Light! Yay!"
+		switchesToToggle.on()
+        masterToggle.on()
+    }
+    
+    else if (evt.value == "open" && masterToggle.currentSwitch == "on")
+    {
+        //log.debug "Kill the lights"
+		switchesToToggle.off()
+        masterToggle.off()
+    }
+}