diff --git a/src/HAP.cpp b/src/HAP.cpp
index 2f051c2..f716a13 100644
--- a/src/HAP.cpp
+++ b/src/HAP.cpp
@@ -1175,6 +1175,16 @@ void HAPClient::callServiceLoops(){
 
 //////////////////////////////////////
 
+void HAPClient::checkNotifications(){
+
+  if(!homeSpan.Notifications.empty()){                                          // if there are Notifications to process    
+    eventNotify(&homeSpan.Notifications[0],homeSpan.Notifications.size());      // transmit EVENT Notifications
+    homeSpan.Notifications.clear();                                             // clear Notifications vector
+  }
+}
+
+//////////////////////////////////////
+
 void HAPClient::checkEvents(){
 
   unsigned long cTime=millis();                   // current time
diff --git a/src/HAP.h b/src/HAP.h
index d80c341..681eb57 100644
--- a/src/HAP.h
+++ b/src/HAP.h
@@ -115,6 +115,7 @@ struct HAPClient {
   static void checkTimedResets();                                                      // checks for Timed Resets and reports to controllers as needed (HAP Section 6.8)
   static void callServiceLoops();                                                      // call the loop() method for any Service with that over-rode the default method
   static void checkEvents();                                                           // checks for Event Notifications and reports to controllers as needed (HAP Section 6.8)
+  static void checkNotifications();                                                    // checks for Event Notifications and reports to controllers as needed (HAP Section 6.8)
   static void checkTimedWrites();                                                      // checks for expired Timed Write PIDs, and clears any found (HAP Section 6.7.2.4)
   static void eventNotify(SpanBuf *pObj, int nObj, int ignoreClient=-1);               // transmits EVENT Notifications for nObj SpanBuf objects, pObj, with optional flag to ignore a specific client
 };
diff --git a/src/HomeSpan.cpp b/src/HomeSpan.cpp
index 713619b..6f82de7 100644
--- a/src/HomeSpan.cpp
+++ b/src/HomeSpan.cpp
@@ -149,7 +149,7 @@ void Span::poll() {
 
   HAPClient::checkTimedResets();
   HAPClient::callServiceLoops();
-  HAPClient::checkEvents();
+  HAPClient::checkNotifications();
   HAPClient::checkTimedWrites();
   
 } // poll
@@ -575,6 +575,8 @@ int Span::updateCharacteristics(char *buf, SpanBuf *pObj){
       
   } // parse objects
 
+  snapTime=millis();                                           // timestamp for this series of updates, assigned to each characteristic in loadUpdate()
+
   for(int i=0;i<nObj;i++){                                     // PASS 1: loop over all objects, identify characteristics, and initialize update for those found
 
     if(twFail){                                                // this is a timed-write request that has either expired or for which there was no PID
@@ -1069,6 +1071,7 @@ StatusCode SpanCharacteristic::loadUpdate(char *val, char *ev){
   } // switch
 
   isUpdated=true;
+  updateTime=homeSpan.snapTime;
   return(StatusCode::TBD);
 }
 
@@ -1103,8 +1106,13 @@ void SpanCharacteristic::setVal(int val){
       break;
     }
 
-    isUpdated=true;
+    updateTime=homeSpan.snapTime;
 
+    SpanBuf sb;                             // create SpanBuf object
+    sb.characteristic=this;                 // set characteristic          
+    sb.status=StatusCode::OK;               // set status
+    sb.val="";                              // set dummy "val" so that sprintfNotify knows to consider this "update"
+    homeSpan.Notifications.push_back(sb);   // store SpanBuf in Notifications vector
 }
 
 ///////////////////////////////
@@ -1112,7 +1120,20 @@ void SpanCharacteristic::setVal(int val){
 void SpanCharacteristic::setVal(double val){
   
     value.FLOAT=(double)val;  
-    isUpdated=true;
+    updateTime=homeSpan.snapTime;
+
+    SpanBuf sb;                             // create SpanBuf object
+    sb.characteristic=this;                 // set characteristic          
+    sb.status=StatusCode::OK;               // set status
+    sb.val="";                              // set dummy "val" so that sprintfNotify knows to consider this "update"
+    homeSpan.Notifications.push_back(sb);   // store SpanBuf in Notifications vector
+}
+
+///////////////////////////////
+
+int SpanCharacteristic::timeVal(){
+  
+  return(homeSpan.snapTime-updateTime);
 }
 
 ///////////////////////////////
diff --git a/src/HomeSpan.h b/src/HomeSpan.h
index 8c28048..d01348c 100644
--- a/src/HomeSpan.h
+++ b/src/HomeSpan.h
@@ -52,6 +52,7 @@ struct Span{
   vector<SpanTimedReset *> TimedResets;             // vector of pointers to all TimedResets
   vector<SpanEvent *> Events;                       // vector of pointer to all Events
   vector<SpanService *> Loops;                      // vector of pointer to all Services that have over-ridden loop() methods
+  vector<SpanBuf> Notifications;                    // vector of SpanBuf objects that store info for Characteristics that are updated with setVal() and require a Notification Event
   unordered_map<uint64_t, uint32_t> TimedWrites;    // map of timed-write PIDs and Alarm Times (based on TTLs)
   
   void begin(Category catID,
@@ -157,7 +158,8 @@ struct SpanCharacteristic{
   boolean ev[MAX_CONNECTIONS]={false};     // Characteristic Event Notify Enable (per-connection)
   
   int aid=0;                               // Accessory ID - passed through from Service containing this Characteristic
-  boolean isUpdated=false;                 // set to true when new value has been requested by PUT /characteristic, or when value is updated with setVal()
+  boolean isUpdated=false;                 // set to true when new value has been requested by PUT /characteristic
+  unsigned long updateTime;                // last time value was updated (in millis) either by PUT /characteristic OR by setVal()
   UVal newValue;                           // the updated value requested by PUT /characteristic
   SpanService *service=NULL;               // pointer to Service containing this Characteristic
       
@@ -182,6 +184,7 @@ struct SpanCharacteristic{
   void setVal(double value);                                                        // sets value of UVal value for FLOAT Characteristic type
 
   boolean updated(){return(isUpdated);}                                             // returns isUpdated
+  int timeVal();                                                                    // returns time elapsed (in millis) since value was last updated
   
 };