diff --git a/MikuDuino.cpp b/MikuDuino.cpp
index 62bc921..9c9979b 100755
--- a/MikuDuino.cpp
+++ b/MikuDuino.cpp
@@ -1,5 +1,16 @@
 #include "MikuDuino.h"
 
+/*
+ * MikuDuino.cpp:
+ *
+ *	Welcome to MikuQ.com! MikuDuino for BananaPi 
+ *	
+ *     by MikuQ(i@mikuq.com)
+ *	
+ * https://github.com/bpiq/MikuPi
+ *
+ */
+
 int main()
 {
   mikuPiSetup();
diff --git a/MikuPi.cpp b/MikuPi.cpp
index e267688..538bf2f 100755
--- a/MikuPi.cpp
+++ b/MikuPi.cpp
@@ -6,6 +6,17 @@
 #include <fcntl.h>
 #include <unistd.h>
 
+/*
+ * MikuPi.cpp:
+ *
+ *	Welcome to MikuQ.com! MikuDuino for BananaPi 
+ *	
+ *     by MikuQ(i@mikuq.com)
+ *	
+ * https://github.com/bpiq/MikuPi
+ *
+ */
+
 #include "MikuPi.h"
 
 const char *piModelNames [7] =
@@ -154,7 +165,7 @@ void piBoardId(int *model, int *mem)
   }
 }
 
-void sayhello()
+void sayHello()
 {
 	int model, mem;
 	printf("Welcome to MikuQ.com! MikuDuino for BananaPi version: %s\n", VERSION);
diff --git a/MikuRelay.cpp b/MikuRelay.cpp
new file mode 100755
index 0000000..c355391
--- /dev/null
+++ b/MikuRelay.cpp
@@ -0,0 +1,42 @@
+#include "MikuDuino.h"
+#include "MikuRelay.h"
+
+/*
+ * MikuRelay.cpp:
+ *
+ *	Welcome to MikuQ.com! MikuDuino for BananaPi 
+ *	
+ *     by MikuQ(i@mikuq.com)
+ *	
+ * https://github.com/bpiq/MikuPi
+ *
+ */
+
+
+Miku_Relay::Miku_Relay()
+{
+  onPin=D13;
+  offPin=D11;
+}
+
+Miku_Relay::Miku_Relay(int on, int off)
+{
+  onPin=on;
+  offPin=off;
+}
+
+void Miku_Relay::setOn(void)
+{
+  pinMode (onPin, OUTPUT) ;
+  digitalWrite(onPin,  LOW) ;
+  delay (10) ;  
+  digitalWrite(onPin, HIGH) ;
+}
+
+void Miku_Relay::setOff(void)
+{
+  pinMode (offPin, OUTPUT) ;
+  digitalWrite(offPin,  LOW) ;
+  delay (10) ;  
+  digitalWrite(offPin, HIGH) ;
+}
diff --git a/MikuRelay.h b/MikuRelay.h
new file mode 100755
index 0000000..3d8b364
--- /dev/null
+++ b/MikuRelay.h
@@ -0,0 +1,14 @@
+#ifndef _MIKU_RELAY_H_
+#define _MIKU_RELAY_H_
+
+class Miku_Relay {
+ public:
+  Miku_Relay();
+  Miku_Relay(int on, int off);
+  void setOn(void);
+  void setOff(void);
+ private:
+  int onPin, offPin;
+};
+
+#endif
\ No newline at end of file
diff --git a/examples/relay b/examples/relay
new file mode 100755
index 0000000..5be0b8b
Binary files /dev/null and b/examples/relay differ
diff --git a/examples/relay.cpp b/examples/relay.cpp
new file mode 100755
index 0000000..f1ad247
--- /dev/null
+++ b/examples/relay.cpp
@@ -0,0 +1,28 @@
+/*
+ * relay.cpp:
+ *
+ *	Welcome to MikuQ.com! MikuDuino for BananaPi 
+ *	
+ *     by MikuQ(i@mikuq.com) 2016-6-4
+ *	
+ * https://github.com/bpiq/MikuPi
+ *
+ */
+
+#include "MikuDuino.h"
+#include "MikuRelay.h"
+
+Miku_Relay relay;
+
+void setup()
+{	
+	sayHello();
+}
+
+void loop()
+{
+	relay.setOn();
+	delay(2000);
+	relay.setOff();
+	delay(8000);
+}
diff --git a/makefile b/makefile
index 094ebbe..2394785 100755
--- a/makefile
+++ b/makefile
@@ -1,6 +1,6 @@
-libMikuDuino.so : MikuPi.cpp MikuDuino.cpp
-	@gcc MikuPi.cpp MikuDuino.cpp -fPIC -shared -o libMikuDuino.so
-	@install libMikuDuino.so /usr/lib/
+libMikuDuino.so : MikuPi.cpp MikuDuino.cpp MikuRelay.cpp
+	@gcc $^ -fPIC -shared -o $@
+	@install $@ /usr/lib/
 	@install *.h /usr/include/
 	@rm -f *.so
 	@echo 'install OK!'