Button: limit dataHandler call to changes.

rwaldron · Jun 18, 2015 · 3da536c · 3da536c
1 parent c3d83e7
commit 3da536c
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/lib/button.js b/lib/button.js
@@ -30,7 +30,14 @@ var Controllers = {
           this.io.digitalWrite(this.pin, this.io.HIGH);
         }
 
-        this.io.digitalRead(this.pin, dataHandler);
+        var last = null;
+
+        this.io.digitalRead(this.pin, function(data) {
+          if (data !== last) {
+            dataHandler(data);
+          }
+          last = data;
+        });
       }
     },
     toBoolean: {