diff --git a/sk_demo/src/Mono.cs b/sk_demo/src/Mono.cs
index 31d03ed..7c7323c 100644
--- a/sk_demo/src/Mono.cs
+++ b/sk_demo/src/Mono.cs
@@ -214,6 +214,7 @@ public class Mono {
   Rig.Btn keyboard_btn = new();
   Vec3 index_pos = Vec3.Zero;
   int  index_i = 0;
+  int last_index_i = 0;
 
   string txt = "hello ";
 
@@ -262,12 +263,17 @@ public class Mono {
       index_pos.y = (float)Math.Clamp(Math.Round(index_tip.y), 0,  3-1);
 
       index_i = (int)(index_pos.y * 10 + index_pos.x);
+
+      if (index_i != last_index_i) {
+        last_index_i = index_i;
+        // Log.Info($"index_i: {index_i}");
+        monoNet.value = index_i;
+        monoNet.send = true;
+      }
     }
 
     if (keyboard_btn.frameDown) {
-      Log.Info($"index_i: {index_i}");
-      monoNet.value = index_i;
-      monoNet.send = true;
+      // send haptic input for input confirmation
       txt += KeyToChar(index_i);
     }