diff --git a/homework3/.eide/eide.json b/homework3/.eide/eide.json
index cf6ed1b..665313e 100644
--- a/homework3/.eide/eide.json
+++ b/homework3/.eide/eide.json
@@ -20,7 +20,8 @@
     "Debug": {
       "excludeList": [
         "src/test1.c",
-        "src/test2.c"
+        "src/test2.c",
+        "src/test3.c"
       ],
       "toolchain": "Keil_C51",
       "compileConfig": {
diff --git a/homework3/homework3.pdsprj b/homework3/homework3.pdsprj
index 8a7403b..269e8e7 100644
Binary files a/homework3/homework3.pdsprj and b/homework3/homework3.pdsprj differ
diff --git a/homework3/homework3_test4.pdsprj b/homework3/homework3_test4.pdsprj
new file mode 100644
index 0000000..a30d83d
Binary files /dev/null and b/homework3/homework3_test4.pdsprj differ
diff --git a/homework3/src/test4.c b/homework3/src/test4.c
new file mode 100644
index 0000000..fcaa1bc
--- /dev/null
+++ b/homework3/src/test4.c
@@ -0,0 +1,2 @@
+// test4.c
+// 交通灯（用红黄绿三种颜色LED模拟十字路口交通灯状态，点亮时间红灯>绿灯>黄灯）
\ No newline at end of file