demo: renamed demo folder to sample, updated readme

CMakeLists.txt

@@ -116,7 +116,7 @@ target_include_directories(${PROJECT_NAME} PUBLIC
     
 # Build demo
 if(BUILD_WITHOUT_ROS)
-    add_subdirectory(demo)
+    add_subdirectory(sample)
 endif()
 
 # Build tests

README.md

@@ -120,14 +120,21 @@ The log file can be replayed using the following command
 $ canplayer -I <candump-log-file-name>.log
 ```
 
-## Demo Code
+## Sample Code
 
-You can find demo code for each robot in "demo" folder. For example, run the demo for Scout robot
+You can find sample code for each robot in "sample" folder. For example, you can run the demo for Scout robot
 
 ```
 $ ./bin/demo_scout_robot can0
 ```
 
+**Important note:**
+
+* **The demo program may command the robot to move!** Please make sure you have the remote controller with you and the
+  robot is in a safe place to move around. You can also modify the demo code to disable the motion commands.
+* If the robot is not moving as expected, please first check if the remote controller is in manual mode and if the
+  E-Stop buttons are released.
+
 ## Reference
 
 * [CAN command reference in Linux](https://notes.rdu.im/system/linux/canbus/)

sample/tracer_demo/tracer_robot_demo.cpp

@@ -59,7 +59,7 @@ int main(int argc, char **argv) {
   while (true) {
     // motion control
     std::cout << "Motor: 1.0, 0" << std::endl;
-    tracer->SetMotionCommand(0.0, 0.0);
+    tracer->SetMotionCommand(1.0, 0.0);
 
     // get robot state
     auto state = tracer->GetRobotState();