diff --git a/demo_cpp/6_imu_behavior_class.cpp b/demo_cpp/6_imu_behavior_class.cpp
new file mode 100644
index 0000000..c556bf0
--- /dev/null
+++ b/demo_cpp/6_imu_behavior_class.cpp
@@ -0,0 +1,59 @@
+#include <rclcpp/rclcpp.hpp>
+#include <sensor_msgs/msg/imu.hpp>
+#include <geometry_msgs/msg/twist.hpp>
+#include <tf2/LinearMath/Quaternion.h>
+#include <tf2/LinearMath/Matrix3x3.h>
+
+class IMUBehaviorNode : public rclcpp::Node
+{
+public:
+  IMUBehaviorNode()
+    : Node("imu_behavior_node")
+  {
+    imu_sub_ = create_subscription<sensor_msgs::msg::Imu>(
+      "imu", 
+      100, 
+      std::bind(&IMUBehaviorNode::imuCallback, this, std::placeholders::_1));
+
+    vel_pub_ = create_publisher<geometry_msgs::msg::Twist>("/cmd_vel", 10);
+  }
+
+private:
+  void imuCallback(const sensor_msgs::msg::Imu::SharedPtr msg)
+  {
+    tf2::Quaternion tf2_quaternion;
+    tf2_quaternion.setX(msg->orientation.x);
+    tf2_quaternion.setY(msg->orientation.y);
+    tf2_quaternion.setZ(msg->orientation.z);
+    tf2_quaternion.setW(msg->orientation.w);
+
+    tf2::Matrix3x3 matrix(tf2_quaternion);
+
+    double roll, pitch, yaw;
+    matrix.getRPY(roll, pitch, yaw);
+    roll = roll * 180 / M_PI;
+    pitch = pitch * 180 / M_PI;
+    yaw = yaw * 180 / M_PI;
+    RCLCPP_INFO(get_logger(), "roll= %.0f pitch= %.0f yaw= %.0f", roll, pitch, yaw);
+
+    double target_yaw = 90;
+
+    geometry_msgs::msg::Twist vel_msg;
+    double diff_angle = target_yaw - yaw;
+    vel_msg.angular.z = diff_angle * 0.01;
+    vel_msg.linear.x = 0.1;
+    vel_pub_->publish(vel_msg);
+  }
+
+  rclcpp::Subscription<sensor_msgs::msg::Imu>::SharedPtr imu_sub_;
+  rclcpp::Publisher<geometry_msgs::msg::Twist>::SharedPtr vel_pub_;
+};
+
+int main(int argc, char** argv)
+{
+  rclcpp::init(argc, argv);
+  auto node = std::make_shared<IMUBehaviorNode>();
+  rclcpp::spin(node);
+  rclcpp::shutdown();
+  return 0;
+}
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diff --git a/demo_cpp/6_imu_data_class.cpp b/demo_cpp/6_imu_data_class.cpp
new file mode 100644
index 0000000..49910bf
--- /dev/null
+++ b/demo_cpp/6_imu_data_class.cpp
@@ -0,0 +1,47 @@
+#include <rclcpp/rclcpp.hpp>
+#include <sensor_msgs/msg/imu.hpp>
+#include <tf2/LinearMath/Quaternion.h>
+#include <tf2/LinearMath/Matrix3x3.h>
+
+class IMUDataNode : public rclcpp::Node
+{
+public:
+  IMUDataNode()
+    : Node("imu_data_node")
+  {
+    imu_sub_ = create_subscription<sensor_msgs::msg::Imu>(
+      "/imu", 
+      100, 
+      std::bind(&IMUDataNode::imuCallback, this, std::placeholders::_1));
+  }
+
+private:
+  void imuCallback(const sensor_msgs::msg::Imu::SharedPtr msg)
+  {
+    tf2::Quaternion tf2_quaternion;
+    tf2_quaternion.setX(msg->orientation.x);
+    tf2_quaternion.setY(msg->orientation.y);
+    tf2_quaternion.setZ(msg->orientation.z);
+    tf2_quaternion.setW(msg->orientation.w);
+
+    tf2::Matrix3x3 matrix(tf2_quaternion);
+
+    double roll, pitch, yaw;
+    matrix.getRPY(roll, pitch, yaw);
+    roll = roll * 180 / M_PI;
+    pitch = pitch * 180 / M_PI;
+    yaw = yaw * 180 / M_PI;
+    RCLCPP_INFO(get_logger(), "roll= %.0f pitch= %.0f yaw= %.0f", roll, pitch, yaw);
+  }
+
+  rclcpp::Subscription<sensor_msgs::msg::Imu>::SharedPtr imu_sub_;
+};
+
+int main(int argc, char** argv)
+{
+  rclcpp::init(argc, argv);
+  auto node = std::make_shared<IMUDataNode>();
+  rclcpp::spin(node);
+  rclcpp::shutdown();
+  return 0;
+}
\ No newline at end of file