MSA-1559: Trend Setter is a SmartApp for grouping together devices for synchronised control and/or data aggregation using virtual devices that act as a controller device and interface for other devices in the group. At present there are 4 group types:

Switch - Group switch control
Dimmer - Group level/switch control
Colorful Light - Group colour/level/switch control
Power Meter - Averaged total power usage for group with High/Medium/Low usage indicator based on previous data (Experimental, possibly very inaccurate)

More information is better found here:
https://community.smartthings.com/t/release-trend-setter/31286

The SmartApp seems to be quite popular now so I thought I would submit it for publication as some people aren't keen on having to install multiple SmartApps and Device Handlers.

devicetypes/kriskit-trendsetter/colorful-light-group-device.src/colorful-light-group-device.groovy

@@ -0,0 +1,394 @@
+/**
+ *  Trend Setter - Colorful Light Group Device
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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.
+ *
+ */
+metadata {
+	definition (name: "Colorful Light Group Device", namespace: "kriskit.trendSetter", author: "Chris Kitch") {
+		capability "Actuator"
+		capability "Sensor"
+		capability "Switch"
+		capability "Switch Level"
+        capability "Color Control"
+        
+        command "adjustLevel"
+        command "adjustSaturation"
+        command "adjustHue"
+        
+        attribute "onPercentage", "number"
+        attribute "levelSync", "string"
+        attribute "colorSync", "string"
+        attribute "saturationSync", "string"
+        attribute "hueSync", "string"
+	}
+
+	simulator {
+		// TODO: define status and reply messages here
+	}
+
+	tiles(scale: 2) {
+		multiAttributeTile(name:"switch", type: "lighting", width: 6, height: 4, canChangeIcon: true){
+			tileAttribute ("device.switch", key: "PRIMARY_CONTROL") {
+				attributeState "on", label: '${name}', action: "switch.off", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "off", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#ffffff", nextState: "turningOn"
+				attributeState "turningOn", label: '${name}', action: "switch.off", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "turningOff", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#ffffff", nextState: "turningOn"
+                attributeState "half", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#a3d164", nextState: "turningOn"
+                attributeState "mostlyOn", label: 'Onish', action: "switch.on", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOn"
+                attributeState "mostlyOff", label: 'Offish', action: "switch.off", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#d1e5b5", nextState: "turninOff"
+			}
+            
+            tileAttribute ("device.color", key: "COLOR_CONTROL") {
+            	attributeState "color", action: "color control.setColor"
+            }
+            
+			tileAttribute ("device.onPercentage", key: "SECONDARY_CONTROL") {
+				attributeState "onPercentage", label:'${currentValue}% On'
+                attributeState "100", label:'All On'
+                attributeState "0", label:'All Off'
+			}
+            
+            tileAttribute("device.level", key: "SLIDER_CONTROL") {
+              attributeState "default", label: '', action: "switch level.setLevel"
+    		}
+		}
+        
+        standardTile("levelLabel", "levelLable", height:1, width:1, decoration: "flat", inactiveLabel: true) {
+            state "default", label:"Level", unit:"", icon: "st.illuminance.illuminance.light"
+        }
+        
+        controlTile("levelSliderControl", "device.level", "slider", height: 1, width: 3, inactiveLabel: false) {
+            state "level", action:"switch level.setLevel"
+        }
+        
+        valueTile("levelValue", "device.level", inactiveLabel: true, height:1, width:1, decoration: "flat") {
+            state "default", label:'${currentValue}%', unit:""
+        }
+        
+        valueTile("levelSync", "device.levelSync", height:1, width:1) {
+            state "default", label:' Sync ', unit:"", action: "adjustLevel", backgroundColor: "#ff9900"
+            state "ok", label:'', unit:"", backgroundColor: "#00b509"
+        }
+        
+        standardTile("saturationLabel", "saturationLabel", height:1, width:1, decoration: "flat", inactiveLabel: true) {
+            state "default", label:"Sat", unit:"", icon: "st.Kids.kids2"
+        }
+        
+        controlTile("saturationSliderControl", "device.saturation", "slider", height: 1, width: 3, inactiveLabel: false) {
+            state "saturation", action:"color control.setSaturation"
+        }
+        
+        valueTile("saturationValue", "device.saturation", inactiveLabel: true, height:1, width:1, decoration: "flat") {
+            state "default", label:'${currentValue}%', unit:""
+        }
+        
+        valueTile("saturationSync", "device.saturationSync", height:1, width:1) {
+            state "default", label:' Sync ', unit:"", action: "adjustSaturation", backgroundColor: "#ff9900"
+            state "ok", label:'', unit:"", backgroundColor: "#00b509"
+        }
+        
+        standardTile("hueLabel", "hueLabel", height:1, width:1, decoration: "flat", inactiveLabel: true) {
+            state "default", label:"Hue", unit:"", icon: "st.Kids.kids2"
+        }
+        
+        controlTile("hueSliderControl", "device.hue", "slider", height: 1, width: 3, inactiveLabel: false) {
+            state "hue", action:"color control.setHue"
+        }
+        
+        valueTile("hueValue", "device.hue", inactiveLabel: true, height:1, width:1, decoration: "flat") {
+            state "default", label:'${currentValue}%', unit:""
+        }
+        
+        valueTile("hueSync", "device.hueSync", height:1, width:1) {
+            state "default", label:' Sync ', unit:"", action: "adjustHue", backgroundColor: "#ff9900"
+            state "ok", label:'', unit:"", backgroundColor: "#00b509"
+        }
+	}
+    
+    main "switch"
+    details([
+    	"switch", 
+        "levelLabel", 
+        "levelSliderControl", 
+        "levelValue", 
+        "levelSync", 
+        "saturationLabel", 
+        "saturationSliderControl", 
+        "saturationValue", 
+        "saturationSync",
+        "hueLabel",
+        "hueSliderControl",
+        "hueValue",
+        "hueSync"])
+}
+
+def parse(String description) {
+}
+
+def groupSync(name, values) {
+	try {
+    	"sync${name.capitalize()}"(values)	
+    } catch(ex) {
+    	log.error "Error executing 'sync${name.capitalize()}' method: $ex"
+    }
+}
+
+// SWITCH
+def on() {
+	on(true)
+}
+
+def on(triggerGroup) {
+	sendEvent(name: "switch", value: "on")
+    sendEvent(name: "onPercentage", value: 100, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("on")
+}
+
+def off() {
+	off(true)
+}
+
+def off(triggerGroup) {
+	sendEvent(name: "switch", value: "off")
+    sendEvent(name: "onPercentage", value: 0, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("off")
+}
+
+def syncSwitch(values) {
+	log.debug "syncSwitch(): $values"
+    
+    def onCount = values?.count { it == "on" }
+    def percentOn = (int)Math.floor((onCount / values?.size()) * 100)
+    
+    log.debug "Percent On: $percentOn"
+    
+    if (percentOn == 0 || percentOn == 100) {
+    	if (percentOn == 0)
+        	off(false)
+        else
+        	on(false)            
+        return
+    }
+    
+    def value = null
+    
+    if (percentOn == 50)
+    	value = "half"
+    else if (percentOn > 0 && percentOn < 50)
+		value = "mostlyOff"
+    else if (percentOn > 50 && percentOn < 100)
+		value = "mostlyOn"
+        
+	sendEvent(name: "switch", value: value)
+	sendEvent(name: "onPercentage", value: percentOn, displayed: false)
+}
+
+// LEVEL
+def setLevel(val) {
+	setLevel(val, true)
+}
+
+def setLevel(val, triggerGroup) {
+	log.debug "Setting level to $val"
+
+    if (val < 0)
+    	val = 0
+    
+    if( val > 100)
+    	val = 100
+    
+    if (triggerGroup) {
+       if (val == 0)
+    	   off()
+       else
+    	   on()
+    }
+        
+    sendEvent(name: "level", value: val, isStateChange: true)
+    sendEvent(name: "switch.setLevel", value: val, isStateChange: true)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("setLevel", [val])
+}
+
+def syncLevel(values) {
+	log.debug "syncLevel(): $values"
+    
+    def valueCount = values?.size()
+    def valueCountBy = values?.countBy { it }
+    def matchValue = "bad"
+    def level = device.currentValue("level")
+    
+    valueCountBy.each { value, count -> 
+    	if (count == valueCount) {
+        	level = value
+            matchValue = "ok"
+        	return true
+        }
+    }
+    
+    if (matchValue == "bad")
+    	level = getAdjustmentLevel(values)
+    
+    setLevel(level, false)
+    sendEvent(name: "levelSync", value: matchValue, displayed: false)
+}
+
+def adjustLevel() {
+	def values = parent.getGroupCurrentValues("level")
+    
+    if (!values)
+    	return
+
+    def level = getAdjustmentLevel(values)    
+    setLevel(level)
+}
+
+def getAdjustmentLevel(values) {
+    if (!values)
+    	return
+        
+    def valueCountBy = values?.countBy { it }
+    valueCountBy = valueCountBy?.sort { a, b -> b.value <=> a.value }
+    
+    def level = device.currentValue("level")
+    
+    if (valueCountBy.size() > 1) {        
+        if (valueCountBy.size() == values.size()) {
+        	log.debug "Values are all different - making average"
+            level = Math.round(values.sum() / values.size())
+        } else {
+			log.debug "Some values are the same, choosing most popular"
+            def firstItem = valueCountBy.find { true }
+            level = firstItem.key
+        }
+    }
+    
+    return level
+}
+
+// COLOR
+def setColor(value) {
+	setColor(value, true)
+}
+
+def setColor(value, triggerGroup) {
+	value.level = null
+    
+    def hex = value.hex
+    
+    if (!hex && value.hue && value.saturation)
+		hex = colorUtil.hslToHex(value.hue, value.saturation)
+        
+	sendEvent(name: "color", value: value.hex, displayed:false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("setColor", [value])
+
+	if (value.saturation)
+		setSaturation(value.saturation, triggerGroup, false)
+        
+    if (value.hue)
+    	setHue(value.hue, triggerGroup, false)
+}
+
+def syncColor(values) {
+	log.debug "syncColor(): $values"
+}
+
+// SATURATION
+def setSaturation(value) {
+	setSaturation(value, true, true)
+}
+
+def setSaturation(value, triggerGroup, sendColor) {
+	on(triggerGroup)
+
+	sendEvent(name: "saturation", value: (int)value, displayed:false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("setSaturation", [value])
+    
+    if (sendColor) {
+    	def hex = colorUtil.hslToHex((int)device.currentValue("hue"), value)
+    	sendEvent(name: "color", value: hex, displayed:false)	
+    }
+}
+
+def syncSaturation(values) {
+	log.debug "syncSaturation(): $values"
+    
+    def valueCount = values?.size()
+    def valueCountBy = values?.countBy { it }
+    def matchValue = "bad"
+    
+    valueCountBy.each { value, count -> 
+    	if (count == valueCount) {
+            matchValue = "ok"
+        	return true
+        }
+    }
+    
+    sendEvent(name: "saturationSync", value: matchValue, displayed: false)
+}
+
+def adjustSaturation() {
+    def saturation = (int)device.currentValue("saturation")    
+	log.debug "adjustSaturation $saturation"
+    setSaturation(saturation)
+}
+
+// HUE
+def setHue(value) {
+	setHue(value, true, true)
+}
+
+def setHue(value, triggerGroup, sendColor) {
+	on(triggerGroup)
+	sendEvent(name: "hue", value: (int)value, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("setHue", [value])
+    
+    if (sendColor) {
+    	def hex = colorUtil.hslToHex(value, (int)device.currentValue("saturation"))
+    	sendEvent(name: "color", value: hex, displayed:false)	
+    }
+}
+
+def syncHue(values) {
+	log.debug "syncHue(): $values"
+    
+    def valueCount = values?.size()
+    def valueCountBy = values?.countBy { it }
+    def matchValue = "bad"
+    
+    valueCountBy.each { value, count -> 
+    	if (count == valueCount) {
+            matchValue = "ok"
+        	return true
+        }
+    }
+    
+    sendEvent(name: "hueSync", value: matchValue, displayed: false)
+}
+
+def adjustHue() {
+    def hue = (int)device.currentValue("hue")    
+	log.debug "adjustHue: $hue"
+    setHue(hue)
+}

devicetypes/kriskit-trendsetter/dimmer-group-device.src/dimmer-group-device.groovy

@@ -0,0 +1,229 @@
+/**
+ *  Trend Setter - Dimmer Group Device
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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.
+ *
+ */
+metadata {
+	definition (name: "Dimmer Group Device", namespace: "kriskit.trendSetter", author: "Chris Kitch") {
+		capability "Actuator"
+		capability "Sensor"
+		capability "Switch"
+		capability "Switch Level"
+        
+        command "adjustLevel"
+        
+        attribute "onPercentage", "number"
+        attribute "levelSync", "string"
+	}
+
+	simulator {
+		// TODO: define status and reply messages here
+	}
+
+	tiles(scale: 2) {
+		multiAttributeTile(name:"switch", type: "lighting", width: 6, height: 4, canChangeIcon: true){
+			tileAttribute ("device.switch", key: "PRIMARY_CONTROL") {
+				attributeState "on", label: '${name}', action: "switch.off", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "off", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#ffffff", nextState: "turningOn"
+				attributeState "turningOn", label: '${name}', action: "switch.off", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "turningOff", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#ffffff", nextState: "turningOn"
+                attributeState "half", label: '${name}', action: "switch.on", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#a3d164", nextState: "turningOn"
+                attributeState "mostlyOn", label: 'Onish', action: "switch.on", icon: "st.lights.multi-light-bulb-on", backgroundColor: "#79b821", nextState: "turningOn"
+                attributeState "mostlyOff", label: 'Offish', action: "switch.off", icon: "st.lights.multi-light-bulb-off", backgroundColor: "#d1e5b5", nextState: "turninOff"
+			}
+            
+			tileAttribute ("device.onPercentage", key: "SECONDARY_CONTROL") {
+				attributeState "onPercentage", label:'${currentValue}% On'
+                attributeState "100", label:'All On'
+                attributeState "0", label:'All Off'
+			}
+            
+            tileAttribute("device.level", key: "SLIDER_CONTROL") {
+              attributeState "default", label: '', action: "switch level.setLevel"
+    		}
+		}
+        
+        standardTile("levelLabel", "levelLable", height:1, width:1, decoration: "flat", inactiveLabel: true) {
+            state "default", label:"Level", unit:"", icon: "st.illuminance.illuminance.bright"
+        }
+        
+        controlTile("levelSliderControl", "device.level", "slider", height: 1, width: 3, inactiveLabel: false) {
+            state "level", action:"switch level.setLevel"
+        }
+        
+        valueTile("levelValue", "device.level", inactiveLabel: true, height:1, width:1, decoration: "flat") {
+            state "default", label:'${currentValue}%', unit:""
+        }
+        
+        valueTile("levelSync", "device.levelSync", height:1, width:1) {
+            state "default", label:' Sync ', unit:"", action: "adjustLevel", backgroundColor: "#ff9900"
+            state "ok", label:'', unit:"", backgroundColor: "#00b509"
+        }
+	}
+    
+    main "switch"
+    details(["switch", "levelLabel", "levelSliderControl", "levelValue", "levelSync"])
+}
+
+def parse(String description) {
+}
+
+def groupSync(name, values) {
+	try {
+    	"sync${name.capitalize()}"(values)	
+    } catch(ex) {
+    	log.error "Error executing 'sync${name.capitalize()}' method: $ex"
+    }
+}
+
+// SWITCH
+def on() {
+	on(true)
+}
+
+def on(triggerGroup) {
+	sendEvent(name: "switch", value: "on")
+    sendEvent(name: "onPercentage", value: 100, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("on")
+}
+
+def off() {
+	off(true)
+}
+
+def off(triggerGroup) {
+	sendEvent(name: "switch", value: "off")
+    sendEvent(name: "onPercentage", value: 0, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("off")
+}
+
+def syncSwitch(values) {
+	log.debug "syncSwitch(): $values"
+    
+    def onCount = values?.count { it == "on" }
+    def percentOn = (int)Math.floor((onCount / values?.size()) * 100)
+    
+    log.debug "Percent On: $percentOn"
+    
+    if (percentOn == 0 || percentOn == 100) {
+    	if (percentOn == 0)
+        	off(false)
+        else
+        	on(false)            
+        return
+    }
+    
+    def value = null
+    
+    if (percentOn == 50)
+    	value = "half"
+    else if (percentOn > 0 && percentOn < 50)
+		value = "mostlyOff"
+    else if (percentOn > 50 && percentOn < 100)
+		value = "mostlyOn"
+        
+	sendEvent(name: "switch", value: value)
+	sendEvent(name: "onPercentage", value: percentOn, displayed: false)
+}
+
+// LEVEL
+def setLevel(val){
+	setLevel(val, true)
+}
+
+def setLevel(val, triggerGroup) {
+	log.debug "Setting level to $val"
+
+    if (val < 0)
+    	val = 0
+    
+    if( val > 100)
+    	val = 100
+    
+    if (triggerGroup) {
+       if (val == 0)
+    	   off()
+       else
+    	   on()
+    }
+        
+    sendEvent(name: "level", value: val, isStateChange: true)
+    sendEvent(name: "switch.setLevel", value: val, isStateChange: true)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("setLevel", [val])
+}
+
+def syncLevel(values) {
+	log.debug "syncLevel(): $values"
+    
+    def valueCount = values?.size()
+    def valueCountBy = values?.countBy { it }
+    def matchValue = "bad"
+    def level = device.currentValue("level")
+    
+    valueCountBy.each { value, count -> 
+    	if (count == valueCount) {
+        	level = value
+            matchValue = "ok"
+        	return true
+        }
+    }
+    
+    if (matchValue == "bad")
+    	level = getAdjustmentLevel(values)
+    
+    setLevel(level, false)
+    sendEvent(name: "levelSync", value: matchValue, displayed: false)
+}
+
+def adjustLevel() {
+	def values = parent.getGroupCurrentValues("level")
+    
+    if (!values)
+    	return
+        
+    def valueCountBy = values?.countBy { it }
+    valueCountBy = valueCountBy?.sort { a, b -> b.value <=> a.value }
+    
+    def level = getAdjustmentLevel(values)
+    
+    setLevel(level)
+}
+
+def getAdjustmentLevel(values) {
+    if (!values)
+    	return
+        
+    def valueCountBy = values?.countBy { it }
+    valueCountBy = valueCountBy?.sort { a, b -> b.value <=> a.value }
+    
+    def level = device.currentValue("level")
+    
+    if (valueCountBy.size() > 1) {        
+        if (valueCountBy.size() == values.size()) {
+        	log.debug "Values are all different - making average"
+            level = Math.round(values.sum() / values.size())
+        } else {
+			log.debug "Some values are the same, choosing most popular"
+            def firstItem = valueCountBy.find { true }
+            level = firstItem.key
+        }
+    }
+    
+    return level
+}

devicetypes/kriskit-trendsetter/power-meter-group-device.src/power-meter-group-device.groovy

@@ -0,0 +1,162 @@
+/**
+ *  Power Meter Group Device
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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.
+ *
+ */
+metadata {
+	definition (name: "Power Meter Group Device", namespace: "kriskit.trendsetter", author: "Chris Kitch") {
+		capability "Power Meter"
+		capability "Sensor"
+        capability "Refresh"
+        
+        attribute "powerUsage", "string"
+	}
+
+	simulator {
+		// TODO: define status and reply messages here
+	}
+
+	tiles(scale: 2) {
+		multiAttributeTile(name:"main", type: "lighting", width: 6, height: 4) {
+			tileAttribute ("device.powerUsage", key: "PRIMARY_CONTROL") {
+				attributeState "off", label: '${name}', backgroundColor: "#ffffff", icon: "st.Appliances.appliances17"
+                attributeState "low", label: '${name}', backgroundColor: "#5CB85C", icon: "st.Appliances.appliances17"
+                attributeState "medium", label: '${name}', backgroundColor: "#ff7b00", icon: "st.Appliances.appliances17"
+                attributeState "high", label: '${name}', backgroundColor: "#c90000", icon: "st.Appliances.appliances17"
+                attributeState "veryHigh", label: '${name}', backgroundColor: "#ff0000", icon: "st.Appliances.appliances17"
+			}
+        
+			tileAttribute ("device.power", key: "SECONDARY_CONTROL") {
+				attributeState "default", label: '${currentValue} W'
+			}
+        }
+        
+        standardTile("refresh", "refresh", height:2, width:6, inactiveLabel: false, decoration: "flat") {
+        	state "default", action: "refresh.refresh", icon:"st.secondary.refresh"
+        }
+        
+        main("main")
+        details(["main", "refresh"])
+	}
+}
+
+// parse events into attributes
+def parse(String description) {
+}
+
+def groupSync(name, values) {
+	try {
+    	"sync${name.capitalize()}"(values)	
+    } catch(ex) {
+    	log.error "Error executing 'sync${name.capitalize()}' method: $ex"
+    }
+}
+
+def refresh() {
+	def powerValues = parent.getGroupCurrentValues("power")
+    syncPower(powerValues)
+}
+
+// POWER
+def syncPower(values) {   
+    log.debug "syncPower(): $values"
+	def total = values?.sum()
+        
+    if (total == 0) {
+    	sendEvent(name: "power", value: 0)
+        sendEvent(name: "powerUsage", value: "off")
+        return
+    }
+    
+	def aggregate = state.powerAggregate ?: []
+	state.powerSyncCount = state.powerSyncCount + 1
+    
+    if (state.powerSyncCount != null && state.powerSyncCount % 5 != 0) {
+        aggregate.push(total)
+        state.powerAggregate = aggregate
+        return
+    }
+
+    def aggregatedAverage = getAverage(aggregate)
+    log.debug "Aggregated Average Power: $aggregatedAverage"
+    sendEvent(name: "power", value: aggregatedAverage)
+
+    def level = getPowerUsageLevel(aggregatedAverage)
+    log.debug "Power usage level: $level"
+    sendEvent(name: "powerUsage", value: level)
+    
+    state.powerAggregate = []
+}
+
+def getPowerUsageLevel(value) {    
+    if (value == 0)
+    	return "off"
+        
+    def boundaries = getPowerUsageBoundaries()
+    
+    if (!boundaries)    
+    	return "low"
+        
+    log.debug "Determining power usage level with boundaries: $boundaries for value $value"
+        
+   	if (value > 0 && value <= boundaries.bottom)
+    	return "low"
+     
+    if (value > boundaries.bottom && value < boundaries.top)
+    	return "medium"
+        
+    if (value >= boundaries.top && value <= boundaries.max)
+    	return "high"
+        
+    if (value > boundaries.max) {
+    	state.powerUsageBoundaries = null
+    	return "veryHigh"
+	}
+}
+
+def getPowerUsageBoundaries() {
+	if (state.powerUsageBoundaries && state.powerSyncCount < 100)
+    	return state.powerUsageBoundaries
+        
+	def events = device.events([max: 500])
+    def powerEvents = events?.findAll {
+    	it.name == "power" && it.doubleValue > 0
+    }
+    
+    def powerValues = powerEvents*.doubleValue
+    powerValues.sort()
+    
+    def eventCount = powerValues?.size()
+    def eventChunkSize = (int)Math.round(eventCount / 2)
+    def chunkedEvents = powerValues.collate(eventChunkSize)
+   
+   if (chunkedEvents.size() < 2)
+   		return null
+
+	def boundaries = [
+    	top: getAverage(chunkedEvents[1]),
+    	bottom: getAverage(chunkedEvents[0]),
+        max: powerValues.max()
+	]        
+    
+   	state.powerSyncCount = 0
+    state.powerUsageBoundaries = boundaries
+    
+    log.debug "New boundaries: $boundaries"
+    
+    return boundaries
+}
+
+def getAverage(values) {
+	return Math.round((values.sum() / values.size()) * 100) / 100
+}

devicetypes/kriskit-trendsetter/switch-group-device.src/switch-group-device.groovy

@@ -0,0 +1,116 @@
+/**
+ *  Trend Setter - Switch Group Device
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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.
+ *
+ */
+metadata {
+	definition (name: "Switch Group Device", namespace: "kriskit.trendSetter", author: "Chris Kitch") {
+		capability "Actuator"
+		capability "Sensor"
+		capability "Switch"
+        
+        attribute "onPercentage", "number"
+	}
+
+	simulator {
+		// TODO: define status and reply messages here
+	}
+
+	tiles(scale: 2) {
+		multiAttributeTile(name:"switch", type: "lighting", width: 6, height: 4, canChangeIcon: true){
+			tileAttribute ("device.switch", key: "PRIMARY_CONTROL") {
+				attributeState "on", label: '${name}', action: "switch.off", icon: "st.switches.switch.on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "off", label: '${name}', action: "switch.on", icon: "st.switches.switch.off", backgroundColor: "#ffffff", nextState: "turningOn"
+				attributeState "turningOn", label: '${name}', action: "switch.off", icon: "st.switches.switch.on", backgroundColor: "#79b821", nextState: "turningOff"
+				attributeState "turningOff", label: '${name}', action: "switch.on", icon: "st.switches.switch.off", backgroundColor: "#ffffff", nextState: "turningOn"
+                attributeState "half", label: '${name}', action: "switch.on", icon: "st.switches.switch.off", backgroundColor: "#a3d164", nextState: "turningOn"
+                attributeState "mostlyOn", label: 'Onish', action: "switch.on", icon: "st.switches.switch.off", backgroundColor: "#79b821", nextState: "turningOn"
+                attributeState "mostlyOff", label: 'Offish', action: "switch.off", icon: "st.switches.switch.off", backgroundColor: "#d1e5b5", nextState: "turninOff"
+			}
+            
+			tileAttribute ("device.onPercentage", key: "SECONDARY_CONTROL") {
+				attributeState "onPercentage", label:'${currentValue}% On'
+                attributeState "100", label:'All On'
+                attributeState "0", label:'All Off'
+			}
+		}
+	}
+    
+    main "switch"
+    details(["switch"])
+}
+
+def parse(String description) {
+}
+
+def groupSync(name, values) {
+	try {
+    	"sync${name.capitalize()}"(values)	
+    } catch(ex) {
+    	log.error "Error executing 'sync${name.capitalize()}' method: $ex"
+    }
+}
+
+// SWITCH
+def on() {
+	on(true)
+}
+
+def on(triggerGroup) {
+	sendEvent(name: "switch", value: "on")
+    sendEvent(name: "onPercentage", value: 100, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("on")
+}
+
+def off() {
+	off(true)
+}
+
+def off(triggerGroup) {
+	sendEvent(name: "switch", value: "off")
+    sendEvent(name: "onPercentage", value: 0, displayed: false)
+    
+    if (triggerGroup)
+    	parent.performGroupCommand("off")
+}
+
+def syncSwitch(values) {
+	log.debug "syncSwitch(): $values"
+    
+    def onCount = values?.count { it == "on" }
+    def percentOn = (int)Math.floor((onCount / values?.size()) * 100)
+    
+    log.debug "Percent On: $percentOn"
+    
+    if (percentOn == 0 || percentOn == 100) {
+    	if (percentOn == 0)
+        	off(false)
+        else
+        	on(false)            
+        return
+    }
+    
+    def value = null
+    
+    if (percentOn == 50)
+    	value = "half"
+    else if (percentOn > 0 && percentOn < 50)
+		value = "mostlyOff"
+    else if (percentOn > 50 && percentOn < 100)
+		value = "mostlyOn"
+        
+	sendEvent(name: "switch", value: value)
+	sendEvent(name: "onPercentage", value: percentOn, displayed: false)
+}

smartapps/kriskit-trendsetter/group.src/group.groovy

@@ -0,0 +1,317 @@
+/**
+ *  Trend Setter - Group
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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: "Group",
+    namespace: "kriskit.trendSetter",
+    author: "Chris Kitch",
+    description: "A child SmartApp for Trend Setter for handling a group of devices.",
+    category: "My Apps",
+    iconUrl: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon.png",
+    iconX2Url: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon@2x.png",
+    iconX3Url: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon@3x.png",
+    parent: "kriskit.trendsetter:Trend Setter")
+    
+def version() {
+	return "1.0"
+}
+
+def typeDefinitions() {
+	return [
+        [
+        	type: "switch", 
+            singular: "Switch", 
+            plural: "Switches", 
+            deviceType: "Switch Group Device",
+            attributes: [
+            		[name: "switch"]
+            	]
+        ],
+        [
+        	type: "switchLevel", 
+            singular: "Dimmer", 
+            plural: "Dimmers", 
+            deviceType: "Dimmer Group Device",
+            inherits: "switch",
+            attributes: [
+            	[name: "level"]
+            ]
+        ],
+        [
+        	type: "colorControl",
+            singular: "Colorful Light",
+            plural: "Colorful Lights",
+            deviceType: "Colorful Light Group Device",
+            inherits: "switchLevel",
+            attributes: [
+            	[name: "hue"],
+                [name: "saturation"],
+                [name: "color"]
+            ]
+        ],
+        [
+        	type: "powerMeter",
+            singular: "Power Meter",
+            plural: "Power Meters",
+            deviceType: "Power Meter Group Device",
+            attributes: [
+            	[name: "power"]
+            ]
+        ]
+    ]
+}
+
+// Setup
+preferences {
+	page(name: "configure")
+}
+
+def configure() {
+	atomicState.typeDefinitions = null
+	def controller = getControllerDevice();
+
+	dynamicPage(name: "configure", uninstall: controller != null, install: true) {   
+        if (!controller) {
+           section {              
+				input "deviceType", "enum", title: "Device Type", required: true, submitOnChange: true, options: getDeviceTypeOptions()
+                paragraph "This cannot be changed once the group is created.", color: "#ffcc00"
+            }
+        }
+        
+        if (deviceType) {
+           	def definition = getTypeDefinition(deviceType)
+        
+            section(title: controller == null ? "Grouping" : null) {
+        		label title: "Group Name", required: true
+            
+                input "devices", "capability.${deviceType}", title: "${definition.plural}", multiple: true, required: true, submitOnChange: controller != null
+
+                if (selectedDevicesContainsController()) {
+                    paragraph "WARNING: You have selected the controller ${definition.singular.toLowerCase()} for this group. This will likely cause unexpected behaviour.\n\nPlease uncheck the '${controller.displayName}' from the selected ${definition.plural.toLowerCase()}.", 
+                        image: "https://cdn2.iconfinder.com/data/icons/freecns-cumulus/32/519791-101_Warning-512.png"
+                }
+            }
+            
+			if (controller == null) {
+                section(title: "Controller") {                        
+                    input "deviceName", "text", title: "${definition.singular} Name", required: true, description: "For the controlling virtual ${definition.singular.toLowerCase()} to be created"
+                }
+            }
+            
+            if (definition.advanced) {
+            	section(title: "Advanced", hidden: true, hideable: true) {
+                }
+            }
+        }
+	}
+}
+
+def installed() {
+	log.debug "Installed with settings: ${settings}"
+    
+	installControllerDevice()
+	initialize()
+}
+
+def uninstalled() {
+	log.debug "Uninstalled"
+}
+
+def installControllerDevice() {
+	def definition = getTypeDefinition()
+
+	log.debug "Installing switch group controller device..."
+	addChildDevice("kriskit.trendSetter", definition.deviceType, UUID.randomUUID().toString(), null, ["name": deviceName, "label": deviceName, completedSetup: true])
+}
+
+def updated() {
+	log.debug "Updated with settings: ${settings}"
+
+	unsubscribe()
+	initialize()
+}
+
+def initialize() {
+	def definition = getTypeDefinition()
+	addSubscriptions(definition)
+    def namesToCheck = definition.attributes?.collect { it.name }
+    updateControllerState(namesToCheck)
+}
+
+def addSubscriptions(definition) {
+	def controller = getControllerDevice()
+
+    definition.attributes?.each {
+    	log.debug "Subscribing to ${it.name}..."
+    	subscribe(devices, it.name, onDeviceAttributeChange)
+    }
+}
+
+// Subscription Handlers
+def onDeviceAttributeChange(evt) {
+	def namesToCheck = atomicState.namesToCheck  ?: []
+
+	log.debug "Device state change: ${evt.device.displayName} -> ${evt.name} = ${evt.value}"
+
+    if (!namesToCheck.any { it == evt.name })
+    	namesToCheck.push(evt.name)
+        
+	atomicState.namesToCheck = namesToCheck
+    runIn(1, "updateControllerState")
+}
+
+def updateControllerState() {
+	def namesToCheck = atomicState.namesToCheck
+    updateControllerState(namesToCheck)
+    atomicState.namesToCheck = null
+}
+
+def updateControllerState(namesToCheck) {
+	if (!namesToCheck)
+    	return
+
+	def controller = getControllerDevice()
+    namesToCheck?.each { name ->
+    	def values = devices?.currentValue(name)
+        values?.removeAll([null])
+        log.debug "Updating Controller State: $name -> $values"
+        controller.groupSync(name, values)
+    }
+}
+
+def performGroupCommand(command, arguments = null) {
+	runCommand(devices, command, arguments ?: []) 
+}
+
+def runCommand(target, command, args) {
+    log.debug "Running command '${command}' with arguments ${args} on ${target}..."
+    $performCommand(target, command, args)
+}
+
+def getGroupCurrentValues(name) {
+	return devices?.currentValue(name)
+}
+
+// Utilities
+def getTypeDefinitions() {
+	if (atomicState.version != version()) {
+    	atomicState.typeDefinitions = null
+        atomicState.version = version()
+	}
+
+	if (atomicState.typeDefinitions)
+    	return atomicState.typeDefinitions
+
+	log.debug "Building type definitions..."
+
+	def result = []
+	def definitions = typeDefinitions()
+    
+    definitions?.each { definition ->
+    	if (definition.inherits)
+        	definition = mergeAttributes(definition, definitions.find { it.type == definition.inherits })
+    
+    	result.push(definition)
+    }
+    
+    atomicState.typeDefinitions = result
+    
+    return result
+}
+
+def mergeAttributes(definition, inheritedDefinition) {
+    inheritedDefinition.attributes?.each { attr ->
+    	if (!definition.attributes?.any { it.name == attr.name })
+        	definition.attributes.push(attr)
+    }
+    
+    if (inheritedDefinition.inherits) {
+    	def definitions = typeDefinitions()
+    	definition = mergeAttributes(definition, definitions.find { it.type == inheritedDefinition.inherits })
+	}
+    
+    return definition
+}
+
+def getControllerDevice() {
+	return getChildDevices()?.find { true }
+}
+
+def getTypeDefinition() {
+	return getTypeDefinition(deviceType)
+}
+
+def getTypeDefinition(type) {
+	return getTypeDefinitions().find {
+    	it.type == type
+    }
+}
+
+def getDeviceTypeOptions() {
+	return getTypeDefinitions().collect {
+    	["${it.type}": it.singular]
+    }
+}
+
+def selectedDevicesContainsController() {
+	def controller = getControllerDevice()
+	return devices?.any { 
+    	it?.deviceNetworkId == controller?.deviceNetworkId 
+    }
+}
+
+private $performCommand(target, command, args) {
+    switch(args?.size()) {
+    	default: 
+        	target?."$command"()
+        break
+    
+    	case 1: 
+        	target?."$command"(args[0])
+        break
+        
+		case 2: 
+        	target?."$command"(args[0], args[1])
+        break
+        
+		case 3: 
+        	target?."$command"(args[0], args[1], args[2])
+        break
+        
+		case 4: 
+        	target?."$command"(args[0], args[1], args[2], args[3])
+        break
+        
+		case 5: 
+        	target?."$command"(args[0], args[1], args[2], args[3], args[4], args[5])
+        break
+        
+		case 6: 
+        	target?."$command"(args[0], args[1], args[2], args[3], args[4], args[5], args[6])
+        break
+        
+        case 7: 
+        	target?."$command"(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7])
+        break
+        
+        case 8: 
+        	target?."$command"(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8])
+        break
+        
+        case 9: 
+        	target?."$command"(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9])
+        break
+    }
+}

smartapps/kriskit-trendsetter/trend-setter.src/trend-setter.groovy

@@ -0,0 +1,58 @@
+/**
+ *  Trend Setter
+ *
+ *  Copyright 2015 Chris Kitch
+ *
+ *  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: "Trend Setter",
+    namespace: "kriskit.trendSetter",
+    author: "Chris Kitch",
+    description: "Uses virtual child devices to group other devices together and perform commands and aggregate data from the group.",
+    category: "My Apps",
+    iconUrl: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon.png",
+    iconX2Url: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon@2x.png",
+    iconX3Url: "https://cdn.rawgit.com/Kriskit/SmartThingsPublic/master/smartapps/kriskit/trendsetter/icon@3x.png",
+    singleInstance: true)
+
+
+preferences {
+    page(name: "mainPage")
+}
+
+def mainPage() {
+	dynamicPage(name: "mainPage", title: "Your Groups", install: true, uninstall: true, submitOnChange: true) {
+        section {
+        	app(name: "groups", appName: "Group", namespace: "kriskit.trendSetter", title: "Create Group...", multiple: true)
+        }
+    }
+}
+
+def installed() {
+	log.debug "Installed with settings: ${settings}"
+
+	initialize()
+}
+
+def updated() {
+	log.debug "Updated with settings: ${settings}"
+
+	unsubscribe()
+	initialize()
+}
+
+def initialize() {
+	// TODO: subscribe to attributes, devices, locations, etc.
+}
+
+def childUninstalled() {
+}