diff --git a/smartapps/herna202/smart-im-home.src/smart-im-home.groovy b/smartapps/herna202/smart-im-home.src/smart-im-home.groovy
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+/**
+ *  Smart Im Home
+ *
+ *  Copyright 2016 Fernando Hernandez
+ *
+ *  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: "Smart Im Home",
+    namespace: "Herna202",
+    author: "Fernando Hernandez",
+    description: "Only turn on the light after sunset when you are the first to come home",
+    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") {
+}
+
+
+preferences 
+{
+	section("When I arrive and leave...")
+    {
+		input "presence1", "capability.presenceSensor", title: "Who?",required: true, multiple: true
+	}
+	section("Turn on/off a light...")
+    {
+		input "switch1", "capability.switchLevel",required: true, multiple: true
+	}
+    section("Light Level") 
+    {
+    	input "LightLevel", "number", required: true, title: "How Bright?"
+    }
+    section("Change to this mode when you leave (defaults to Away)") 
+    {
+        input "leaveMode", "mode", required: false ,title: "Mode?"
+    }
+    section("Change to this mode when you return (defaults to Home)") 
+    {
+        input "returnMode", "mode", required: false, title: "Mode?"
+    }
+    section("False alarm threshold (defaults to 2 min)") 
+    {
+        input "falseAlarmThreshold", "decimal", title: "Number of minutes", required: false
+    }
+    section( "Notifications" ) 
+    {
+        input("recipients", "contact", title: "Send notifications to", required: false) 
+        {
+            input "sendPushMessage", "enum", title: "Send a push notification?", options: ["Yes", "No"], required: false
+            input "phone", "phone", title: "Send a Text Message?", required: false
+        }
+    }
+}
+
+def installed()
+{
+    state.howManyPeopleAreHome = isAnyoneHome()
+	subscribe(presence1, "presence", presenceHandler)
+}
+
+def updated()
+{
+	unsubscribe()
+	subscribe(presence1, "presence", presenceHandler)
+}
+
+private findFalseAlarmThreshold() 
+{
+    (falseAlarmThreshold != null && falseAlarmThreshold != "") ? falseAlarmThreshold : 2
+}
+
+private findReturnMode() 
+{
+    (returnMode != null && returnMode != "") ? returnMode : "Home"
+}
+
+private findLeaveMode() 
+{
+    (leaveMode != null && leaveMode != "") ? leaveMode : "Away"
+}
+
+private isAnyoneHome()
+{
+    def result = 0
+    for (person in presence1) 
+    {
+        if (person.currentPresence == "present") 
+        {
+            result++
+        }
+    }
+    return result
+}
+
+def checkIfEveryoneIsActuallyGone() {
+    if (isAnyoneHome() == 0) {
+        def threshold = 1000 * 60 * falseAlarmThreshold - 1000
+        def awayLongEnough = presence1.findAll { person ->
+            def presenceState = presence1.currentState("presence")
+            def elapsed = now() - presenceState.rawDateCreated.time
+            elapsed >= threshold
+        }
+        log.debug "Found ${awayLongEnough.size()} out of ${presence1.size()} person(s) who were away long enough"
+        if (awayLongEnough.size() == presence1.size()) {
+            //def message = "${app.label} changed your mode to '${newMode}' because everyone left home"
+            def message = "SmartThings changed your mode to '${findLeaveMode()}' because everyone left home"
+            log.info message
+            send(message)
+            switch1.setLevel(0)
+            state.howManyPeopleAreHome = 0
+            log.warn "Everyone's away."
+            changeMode(findLeaveMode())
+            runIn(30, "VerifyAway", [overwrite: false])
+        } else {
+            log.debug "not everyone has been away long enough; doing nothing"
+        }
+    } else {
+        log.debug "not everyone is away; doing nothing"
+    }
+}
+
+private send(msg) {
+    if ( sendPushMessage != "No" ) {
+        log.debug( "sending push message" )
+        sendPush( msg )
+    }
+
+    if ( phone ) {
+        log.debug( "sending text message" )
+        sendSms( phone, msg )
+    }
+
+    log.debug msg
+}
+
+def changeMode(newMode) 
+{
+    log.warn "changeMode, location.mode = $location.mode, newMode = $newMode, location.modes = $location.modes"
+
+    if (location.mode != newMode) {
+        if (location.modes?.find{it.name == newMode}) {
+            setLocationMode(newMode)
+            log.warn "changeMode, location.mode = $location.mode, newMode = $newMode, location.modes = $location.modes"
+        }  else {
+            log.warn "Tried to change to undefined mode '${newMode}'"
+        }
+    }
+}
+
+def VerifyHome() 
+{
+	log.warn "VerifyHome, location.mode = $location.mode"
+}
+
+def VerifyAway() 
+{
+	log.warn "VerifyAway, location.mode = $location.mode"
+}
+
+def presenceHandler(evt)
+{
+	def now = new Date()
+	def sunTime = getSunriseAndSunset()
+    def tempHowManyPoepleAreHome = isAnyoneHome()
+    
+	log.debug "nowTime: $now"
+	log.debug "riseTime: $sunTime.sunrise"
+	log.debug "setTime: $sunTime.sunset"
+	log.debug "presenceHandler $evt.name: $evt.value"
+	log.debug "The current mode ID is: ${location.currentMode}"
+
+    if(tempHowManyPoepleAreHome == 0)
+    {
+        log.info "starting debounce sequence"
+        runIn(findFalseAlarmThreshold() * 60, "checkIfEveryoneIsActuallyGone", [overwrite: false])
+    }
+	else if(state.howManyPeopleAreHome)
+    {
+    	log.warn "Someone is already Home, no need to take action"
+    }
+    else
+    {
+        log.warn "First person to arrive, need to take action"
+    	state.howManyPeopleAreHome = tempHowManyPoepleAreHome
+        log.debug "How many people are home after update $state.howManyPeopleAreHome"
+        def message = "SmartThings changed your mode to '${findReturnMode()}' because everyone came home"
+        log.info message
+        send(message)
+        changeMode(findReturnMode())
+        runIn(30, "VerifyHome", [overwrite: false])
+        if(state.howManyPeopleAreHome && (now > sunTime.sunset)) 
+        {
+            switch1.setLevel(LightLevel)
+            log.warn "Welcome home at night!"
+        }
+        else if(state.howManyPeopleAreHome && (now < sunTime.sunset)) 
+        {
+            log.warn "Welcome home at daytime!"
+        }
+    }
+}
+
+