diff --git a/MikuPi.cpp b/MikuPi.cpp
index 538bf2f..036f3e2 100755
--- a/MikuPi.cpp
+++ b/MikuPi.cpp
@@ -19,6 +19,15 @@
 
 #include "MikuPi.h"
 
+char *i2cDevice;
+
+const char *i2cDevices[3] =
+{
+  "/dev/i2c-0",
+  "/dev/i2c-1",
+  "/dev/i2c-2"
+} ;
+
 const char *piModelNames [7] =
 {
   "Unknown",
@@ -180,8 +189,8 @@ void sayHello()
     else
     {
       printf ("BananaPi Details:\n") ;
-      printf ("  Type: %s, Memory: %dMB\n", 
-	  piModelNames [model], mem) ;
+      printf ("  Type: %s, Memory: %dMB\n", piModelNames [model], mem) ;
+      //printf ("  I2C Device: %s\n",i2cDevice) ;
     }
 }
 
@@ -202,14 +211,15 @@ void mikuPiSetup (void)
       printf ("    i@mikuq.com\n") ;
       piBoardRevOops ("with a copy of your /proc/cpuinfo if possible") ;
     }
-	if (model == PI_MODEL_M2p)
-    {
-		wPinToGpio=wPinToGpioM2p;
-    }
-	if (model == PI_MODEL_M3)
-    {
-		wPinToGpio=wPinToGpioM3;
-    }
+
+  if (model == PI_MODEL_M2p) {
+    wPinToGpio=wPinToGpioM2p;
+    i2cDevice=(char *)i2cDevices[0];
+  }
+  if (model == PI_MODEL_M3) {
+    wPinToGpio=wPinToGpioM3;
+    i2cDevice=(char *)i2cDevices[3];
+  }
 
     fd = open("/dev/mem", O_RDWR);
 
diff --git a/MikuPi.h b/MikuPi.h
index 3086001..efa060c 100755
--- a/MikuPi.h
+++ b/MikuPi.h
@@ -27,9 +27,10 @@
 #define PI_MODEL_M3     5
 #define PI_MODEL_M2p    6
 
+extern char *i2cDevice;
 extern const int bPinTowPin[41];
 
-#define	VERSION "0.21"
+#define	VERSION "0.25"
 
 extern const char *piModelNames    [7] ;
 
@@ -43,7 +44,7 @@ void mikuPiSetup (void);
 void pinMode(int pin, int mode);
 void digitalWrite(int pin,int value);
 
-#define SW_PORTC_IO_BASE 0x01c20800
+#define SW_PORTC_IO_BASE 0x01c20800
 #define SW_PORTL_IO_BASE 0x01f02c00
 
 extern unsigned int SUNXI_PIO_BASE;
diff --git a/README.md b/README.md
index dd338f0..23e930b 100755
--- a/README.md
+++ b/README.md
@@ -41,10 +41,12 @@ sudo ./blink
  +-----+-----+---------+------+---+- BPI-M3 -+---+------+---------+-----+-----+
 </code></pre>
 
-1.(2016-05-30) start & sayhello
-2.(2016-06-02) gpio for M2+,M3 & blink
-3.(2016-06-04) update to C++ & add Relay
-4.(2016-06-05) add Wire & SHT2x 
+	1.(2016-05-30) start & sayhello
+	2.(2016-06-02) gpio for M2+,M3 & blink
+	3.(2016-06-04) update to C++ & add Relay
+	4.(2016-06-05) add Wire & SHT2x 
+
+upload
 
 	git add .
 	git commit -a -m "md"
diff --git a/Wire.cpp b/Wire.cpp
index e729209..2e25a93 100755
--- a/Wire.cpp
+++ b/Wire.cpp
@@ -14,6 +14,7 @@
  *
  */
 
+#include "MikuPi.h"
 #include "Wire.h"
 
 uint8 TwoWire::rxBuffer[BUFFER_LENGTH];
@@ -27,7 +28,7 @@ TwoWire::TwoWire()
 void TwoWire::requestFrom(int address, int quantity)
 {
   I2cError = 0;
-  if ((I2cDevHandle = open("/dev/i2c-0", O_RDWR)) < 0)  I2cError |= ERROR_I2C_OPEN;
+  if ((I2cDevHandle = open(i2cDevice, O_RDWR)) < 0)  I2cError |= ERROR_I2C_OPEN;
   else
   {
     if (ioctl(I2cDevHandle, I2C_SLAVE,address) < 0) I2cError |= ERROR_I2C_SETUP;					
@@ -47,7 +48,7 @@ void TwoWire::requestFrom(int address, int quantity)
 void TwoWire::beginTransmission(int address)
 {
   I2cError = 0;
-  if ((I2cDevHandle = open("/dev/i2c-0", O_RDWR)) < 0)  I2cError |= ERROR_I2C_OPEN;
+  if ((I2cDevHandle = open(i2cDevice, O_RDWR)) < 0)  I2cError |= ERROR_I2C_OPEN;
   else
   {
     if (ioctl(I2cDevHandle, I2C_SLAVE,address) < 0) I2cError |= ERROR_I2C_SETUP;					
diff --git a/Wire.h b/Wire.h
index b5bfd70..c365493 100755
--- a/Wire.h
+++ b/Wire.h
@@ -25,7 +25,7 @@ class TwoWire
     void requestFrom(int, int);
     int available(void);
     int read(void);
-	void write(uint8);
+    void write(uint8);
 };
 
 extern TwoWire Wire;