diff --git a/sim/state/color.ts b/sim/state/color.ts
index cb83bc04..42ce61df 100644
--- a/sim/state/color.ts
+++ b/sim/state/color.ts
@@ -29,11 +29,12 @@ namespace pxsim {
         getDeviceType() {
             return DAL.DEVICE_TYPE_COLOR;
         }
-        
+
         setColor(color: number) {
-            this.color = color;
-            this.changed = true;
-            this.valueChanged = true;
+            if (this.color != color) {
+                this.color = color;
+                this.setChangedState();
+            }
         }
 
         getValue() {
diff --git a/sim/state/touch.ts b/sim/state/touch.ts
index 7542ad5b..4c900561 100644
--- a/sim/state/touch.ts
+++ b/sim/state/touch.ts
@@ -14,8 +14,7 @@ namespace pxsim {
 
         public setPressed(pressed: boolean) {
             this.pressed.push(pressed);
-            this.changed = true;
-            this.valueChanged = true;
+            this.setChangedState();
         }
 
         public isPressed() {
diff --git a/sim/visuals/nodes/colorSensorView.ts b/sim/visuals/nodes/colorSensorView.ts
index ae321d0f..19ee2ed7 100644
--- a/sim/visuals/nodes/colorSensorView.ts
+++ b/sim/visuals/nodes/colorSensorView.ts
@@ -12,5 +12,9 @@ namespace pxsim.visuals {
         public getPaddingRatio() {
             return 1 / 8;
         }
+
+        public updateState() {
+            // TODO: show different color modes
+        }
     }
 }
\ No newline at end of file