diff --git a/v0.5/4-demos/03_stopwatch/O-ESD_demo_03_stopwatch.mp4 b/v0.5/4-demos/03_stopwatch/O-ESD_demo_03_stopwatch.mp4 new file mode 100644 index 0000000..cd28e3a Binary files /dev/null and b/v0.5/4-demos/03_stopwatch/O-ESD_demo_03_stopwatch.mp4 differ