diff --git a/README.md b/README.md
index 20dddf2..6d701b3 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,9 @@
 
 ## 实验二——流水灯
 <video controls src="video/exp2.mp4"></video>
+
+## 实验三——七段数码管
+<video controls src="video/exp3.mp4"></video>
+
+## 实验四——独立按键
+<video controls src="video/exp4.mp4"></video>
diff --git a/video/exp3.mp4 b/video/exp3.mp4
new file mode 100644
index 0000000..9d0222f
--- /dev/null
+++ b/video/exp3.mp4
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 8976308
diff --git a/video/exp4.mp4 b/video/exp4.mp4
new file mode 100644
index 0000000..b42b144
--- /dev/null
+++ b/video/exp4.mp4
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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