diff --git a/9/9.uvopt b/9/9.uvopt
new file mode 100644
index 0000000..ddd7689
--- /dev/null
+++ b/9/9.uvopt
@@ -0,0 +1,197 @@
+
+
+
+ 1.0
+
+ ### uVision Project, (C) Keil Software
+
+
+ *.c
+ *.s*; *.src; *.a*
+ *.obj; *.o
+ *.lib
+ *.txt; *.h; *.inc
+ *.plm
+ *.cpp
+ 0
+
+
+
+ 0
+ 0
+
+
+
+ Target 1
+ 0x0
+ MCS-51
+
+ 35000000
+
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+ Source Group 1
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+ .\main.c
+ main.c
+ 0
+ 0
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+
+ 1
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+ 4
+ 0
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+ .\STCBSP_V3.6.LIB
+ STCBSP_V3.6.LIB
+ 0
+ 0
+
+
+
+
diff --git a/9/9.uvproj b/9/9.uvproj
new file mode 100644
index 0000000..e16e5ba
--- /dev/null
+++ b/9/9.uvproj
@@ -0,0 +1,395 @@
+
+
+
+ 1.1
+
+ ### uVision Project, (C) Keil Software
+
+
+
+ Target 1
+ 0x0
+ MCS-51
+ 0
+
+
+ STC15F2K60S2 Series
+ STC
+ IRAM(0-0xFF) XRAM(0-0x6FF) IROM(0-0xEFF8) CLOCK(35000000) MODP2
+
+ "LIB\STARTUP.A51" ("Standard 8051 Startup Code")
+
+ 62472
+ STC15F2K60S2.H
+
+
+
+
+
+
+
+
+
+
+ 0
+ 0
+
+
+
+ STC\
+ STC\
+
+ 0
+ 0
+ 0
+ 0
+ 1
+
+ .\Objects\
+ 9
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+ 1
+ 1
+ 1
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+ 0
+ 0
+ 0
+ 1
+ 0
+ 0
+ 0
+ 0
+ 3
+
+
+ 1
+ 65535
+
+
+ S8051.DLL
+
+ DP51.DLL
+ -pDP8051
+ S8051.DLL
+
+ TP51.DLL
+ -p51
+
+
+
+ 0
+ 0
+ 0
+ 0
+ 16
+
+
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+ ..\inc
+
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+
+
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+
+
+
+
+
+
+
+
+
+
+ Source Group 1
+
+
+ main.c
+ 1
+ .\main.c
+
+
+ STCBSP_V3.6.LIB
+ 4
+ .\STCBSP_V3.6.LIB
+
+
+
+
+
+
+
+
diff --git a/9/main.c b/9/main.c
new file mode 100644
index 0000000..1b3b2a1
--- /dev/null
+++ b/9/main.c
@@ -0,0 +1,33 @@
+// ultrasonic distance sensor
+#include "STC15F2K60S2.H"
+#include "displayer.h"
+#include "sys.h"
+#include "universal_decode_table.h"
+#include "EXT.h"
+
+code unsigned long SysClock = 11059200; //必须。定义系统工作时钟频率(Hz),用户必须修改成与实际工作频率(下载时选择的)一致
+
+void showDist()
+{
+ int dist=GetUltraSonic(),num[5];
+ num[0]=dist/10000;
+ num[1]=(dist%10000)/1000;
+ num[2]=(dist%1000)/100;
+ num[3]=(dist%100)/10;
+ num[4]=dist%10;
+ Seg7Print(num[0],num[1],num[2],num[3],num[4],0,0,0);
+}
+
+void main()
+{
+ DisplayerInit();
+ EXTInit(enumEXTUltraSonic);
+ LedPrint(0);
+ SetDisplayerArea(0, 4);
+ MySTC_Init();
+ SetEventCallBack(enumEventSys10mS, showDist);
+ while (1)
+ {
+ MySTC_OS();
+ }
+}