MSA-1822: A simple utility SmartApp that detects a switch ON condition and after a user-defined delay sets the switch to OFF. May be used anywhere a short on/off pulse of a few seconds is needed. The ON state can be triggered by any sensor or button or timer App. This SmartApp has many potential applications, including pet/fish feeder, garage door opener/closer, door buzzer, visitor welcome light, and more.

smartapps/tchayes57/switch-off-after-delay.src/switch-off-after-delay.groovy

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+/**
+ *  Copyright 2015 SmartThings
+ *
+ *  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.
+ *
+ *  Monitors a switch for ON condition and switches OFF after time delay.
+ *
+ *  Author: SmartThings modified by TC Hayes
+ *
+ *  This app detects the ON status of a switch, waits X seconds, then switches off.
+ *  May be used anywhere a short on/off condition of a few seconds is needed, for example:
+ *  --- An automatic doorbell where a motion sensor switches ON a buzzer. This app terminates the buzz after X seconds. 
+ *  --- An automated pet/fish feeder where a separate timer app turns on the feed switch. This app turns off the flow after X seconds. Use along 
+ *      with a delay timer between feeds eg (Home Monitor / Custom / New Monitoring Rule ...). 
+ *  --- A garage door opener actuator where an on/off pulse of X seconds is needed to either open or close. Any other app can trigger
+ *      the ON condition by detecting motion, button operation of a button, or elapsed time. This app will teminate the pulse with an OFF signal. Use
+ *      ST Smart Home Monitor (Custom / New Monitoring Rule ... ) with this app to close a door left open.
+ *  --- Use with app 'Switch ON After Delay' to create a continuing on/off flashing sequence. (Lighthouse.)
+ **/
+definition(
+    name: "Switch OFF After Delay",
+    namespace: "tchayes57",
+    author: "tchayes57",
+    description: "Monitor switch and respond to an ON condition with OFF after X seconds.",
+    category: "Convenience",
+    )
+
+preferences {
+	section("Switch to be monitored ...") {
+		input "switch1", "capability.switch", required: true
+	}
+    
+    section("Set Delay")  {
+	    input "openTimer", "number", title: "Number of seconds delay", required: true
+		}
+}
+
+def installed() {
+	subscribe(app, appTouchHandler)
+	subscribeToCommand(switch1, "on", onCommand)
+}
+
+def updated() {
+	unsubscribe()
+	subscribe(app, appTouchHandler)
+	subscribeToCommand(switch1, "on", onCommand)
+}
+// identify transition to ON
+def appTouch(evt) {
+	log.debug "appTouch: $evt.value, $evt"
+	switch1?.on()
+}
+
+// initiate OFF after delay
+def onCommand(evt) {
+	log.debug "onCommand: $evt.value, $evt"
+	switch1?.off(delay: openTimer * 1000)
+}