diff --git a/src/playground/blocks/hardware/block_robotisRBPracticalAssembly.js b/src/playground/blocks/hardware/block_robotisRBPracticalAssembly.js
index 561ff6a015..4128d7b09c 100644
--- a/src/playground/blocks/hardware/block_robotisRBPracticalAssembly.js
+++ b/src/playground/blocks/hardware/block_robotisRBPracticalAssembly.js
@@ -45,6 +45,7 @@ Entry.Robotis_rb_P_Assembly = {
         Entry.Robotis_carCont.setRobotisData([
             [Entry.Robotis_rb.INSTRUCTION.WRITE, 2100, 1, 1], // PracticeBot Finish
         ]);
+        camera_id_for_use = 0;
         Entry.Robotis_carCont.update();
     },
     id: ['7.A', '7.B'],
@@ -1155,6 +1156,7 @@ let dxl_last_valid_value = [];
 let rb100_last_valid_value = [];
 let bg_color = 0;
 let beat_per_minute = 75;
+let camera_id_for_use = 0;
 
 const _doevent = ms => new Promise(res => setTimeout(res, ms));
 async function wait(nTime) { await _doevent(nTime); }
@@ -2415,12 +2417,12 @@ Entry.Robotis_rb_P_Assembly.getBlocks = function () {
                 {
                     case 1:
                         address = 2132;
-                        wait_time = 6000;
+                        wait_time = 6500;
                         break;
 
                     case 2:
                         address = 2133;
-                        wait_time = 1600;
+                        wait_time = 2100;
                         break;
                 }
                 
@@ -7056,20 +7058,23 @@ Entry.Robotis_rb_P_Assembly.getBlocks = function () {
                 var data_length = 2;
                 var data_value = script.getNumberValue('ID');
 
-                var data_sendqueue = [
-                    [
-                        data_instruction,
-                        data_address,
-                        data_length,
-                        data_value,
-                    ],
-                ];
-
-                Entry.Robotis_carCont.postCallReturn(
-                    script,
-                    data_sendqueue,
-                    Entry.Robotis_openCM70.delay
-                );
+                if (camera_id_for_use != data_value) {
+                    var data_sendqueue = [
+                        [
+                            data_instruction,
+                            data_address,
+                            data_length,
+                            data_value,
+                        ],
+                    ];
+
+                    Entry.Robotis_carCont.postCallReturn(
+                        script,
+                        data_sendqueue,
+                        Entry.Robotis_openCM70.delay
+                    );
+                    camera_id_for_use = data_value;
+                }
 
                 data_address = 4036; // BLOCK_RESULT_BY_ID_X_CENTER
 
@@ -7149,20 +7154,23 @@ Entry.Robotis_rb_P_Assembly.getBlocks = function () {
                 var data_length = 2;
                 var data_value = script.getNumberValue('ID');
 
-                var data_sendqueue = [
-                    [
-                        data_instruction,
-                        data_address,
-                        data_length,
-                        data_value,
-                    ],
-                ];
-
-                Entry.Robotis_carCont.postCallReturn(
-                    script,
-                    data_sendqueue,
-                    Entry.Robotis_openCM70.delay
-                );
+                if (camera_id_for_use != data_value) {
+                    var data_sendqueue = [
+                        [
+                            data_instruction,
+                            data_address,
+                            data_length,
+                            data_value,
+                        ],
+                    ];
+
+                    Entry.Robotis_carCont.postCallReturn(
+                        script,
+                        data_sendqueue,
+                        Entry.Robotis_openCM70.delay
+                    );
+                    camera_id_for_use = data_value;
+                }
 
                 data_address = 4044; // ARROW_RESULT_BY_ID_X_ORIGIN
 
diff --git a/src/playground/blocks/hardwareLite/block_robotis_robotai_lite.js b/src/playground/blocks/hardwareLite/block_robotis_robotai_lite.js
index a283bfe877..420a9d2edc 100644
--- a/src/playground/blocks/hardwareLite/block_robotis_robotai_lite.js
+++ b/src/playground/blocks/hardwareLite/block_robotis_robotai_lite.js
@@ -156,6 +156,7 @@ const crcTable = [
 const rb100_last_valid_value = [];
 let bg_color = 0;
 let beat_per_minute = 75;
+let camera_id_for_use = 0;
 
 (function () {
     Entry.RobotisRobotaiLite = new (class RobotisRobotaiLite {
@@ -296,6 +297,7 @@ let beat_per_minute = 75;
             this.__removeAllTimeouts();
             this.robotisBuffer = [];
             this.robotisBuffer.push([INST_WRITE, 2100, 1, 1]);
+            camera_id_for_use = 0;
             if (Entry.hwLite && Entry.hwLite.serial) {
                 Entry.hwLite.serial.update();
             }
@@ -2925,12 +2927,12 @@ let beat_per_minute = 75;
                         switch (action) {
                             case 1:
                                 address = 2132;
-                                wait_time = 6000;
+                                wait_time = 6500;
                                 break;
 
                             case 2:
                                 address = 2133;
-                                wait_time = 1600;
+                                wait_time = 2100;
                                 break;
                         }
 
@@ -6995,15 +6997,18 @@ let beat_per_minute = 75;
                         let data_length = 2;
                         let data_value = script.getNumberValue('ID');
 
-                        let data_sendqueue = [
-                            [data_instruction, data_address, data_length, data_value],
-                        ];
+                        if (data_value != camera_id_for_use) {
+                            let data_sendqueue = [
+                                [data_instruction, data_address, data_length, data_value],
+                            ];
 
-                        Entry.RobotisRobotaiLite.postCallReturn(
-                            script,
-                            data_sendqueue,
-                            DEFAULT_DELAY
-                        );
+                            Entry.RobotisRobotaiLite.postCallReturn(
+                                script,
+                                data_sendqueue,
+                                DEFAULT_DELAY
+                            );
+                            camera_id_for_use = data_value;
+                        }
 
                         data_address = 4036; // BLOCK_RESULT_BY_ID_X_CENTER
 
@@ -7080,15 +7085,18 @@ let beat_per_minute = 75;
                         let data_length = 2;
                         let data_value = script.getNumberValue('ID');
 
-                        let data_sendqueue = [
-                            [data_instruction, data_address, data_length, data_value],
-                        ];
+                        if (data_value != camera_id_for_use) {
+                            let data_sendqueue = [
+                                [data_instruction, data_address, data_length, data_value],
+                            ];
 
-                        Entry.RobotisRobotaiLite.postCallReturn(
-                            script,
-                            data_sendqueue,
-                            DEFAULT_DELAY
-                        );
+                            Entry.RobotisRobotaiLite.postCallReturn(
+                                script,
+                                data_sendqueue,
+                                DEFAULT_DELAY
+                            );
+                            camera_id_for_use = data_value;
+                        }
 
                         data_address = 4044; // ARROW_RESULT_BY_ID_X_ORIGIN