Notify after the historical information is appended.

The notification apparently occurs right away, so we need to get the data all
set up before sending the notification or the log view doesn't update at the
right time.

Thermometer.m

@@ -39,16 +39,7 @@ - (void)dealloc
 
 -(void)setValidReading:(float)r
 {
-    // Normal reading update stuff
-    if(reading != r) {
-        float oldreading=reading;
-        reading=r;
-        NSLog(@"Updated %@ (%.2f -> %.2f)", [self name], oldreading, reading);
-
-		// Send the notification
-		[[NSNotificationCenter defaultCenter] 
-			postNotificationName:DATA_UPDATED object:self];
-    }
+	// Grab all the historical and trend data first
 
     // Keep the array small enough.
     while([lastReadings count] >= RING_BUFFER_SIZE) {
@@ -63,6 +54,20 @@ -(void)setValidReading:(float)r
     TempReading *lastReading=[lastReadings lastObject];
     // Remember the trend (upwards or downwards)
     trend=r - [lastReading floatValue];
+
+	// Then process the reading change and send notifications
+
+    // Normal reading update stuff
+    if(reading != r) {
+        float oldreading=reading;
+        reading=r;
+        NSLog(@"Updated %@ (%.2f -> %.2f)", [self name], oldreading, reading);
+
+		// Send the notification
+		[[NSNotificationCenter defaultCenter] 
+			postNotificationName:DATA_UPDATED object:self];
+    }
+
 }
 
 // Check for valid values