diff --git a/Sensors/MCP4725.c b/Sensors/MCP4725.c
index 19513aa..91e2ac6 100644
--- a/Sensors/MCP4725.c
+++ b/Sensors/MCP4725.c
@@ -43,18 +43,19 @@ void _i2c_MCP4725_setVoltage( T_ULONG output, T_BOOLEAN writeEEPROM )
 {
 	I2C.start(MCP4725.address);	
 	
+	
 	if (writeEEPROM)
 	{
 		//I2C.send(MCP4725_CMD_WRITEDACEEPROM);
 	}
 	else
 	{
-		//I2C.send(MCP4725_CMD_WRITEDAC);
+		I2C.send( (T_UBYTE)(0x000F & (output>>8)) );	// Upper data bits          (D11.D10.D9.D8.D7.D6.D5.D4)
+		I2C.send( (T_UBYTE)(0x00FF & (output)) );  		// Lower data bits          (D3.D2.D1.D0.x.x.x.x)
 	}
 	
-	I2C.send( (T_UBYTE)(0x000F & (output>>8)) );	// Upper data bits          (D11.D10.D9.D8.D7.D6.D5.D4)
-	I2C.send( (T_UBYTE)(0x00FF & (output)) );  		// Lower data bits          (D3.D2.D1.D0.x.x.x.x)
-	I2C.end();
+	I2C.end(1);
+
 }
 
 
diff --git a/Sensors/MMA8451.c b/Sensors/MMA8451.c
new file mode 100644
index 0000000..953b350
--- /dev/null
+++ b/Sensors/MMA8451.c
@@ -0,0 +1,36 @@
+#include "oswlib/settings.h"
+#include "oswlib/I2C/i2c.h"
+#include "oswlib/Sensors/MMA8451.h"
+
+MMA8451STR MMA8451 = {
+	MMA8451_SA0_GND,
+	_i2c_MMA8451_init, 		  
+	_i2c_MMA8451_ID, 		   
+};
+
+void _i2c_MMA8451_init(T_UBYTE addr)
+{
+	MMA8451.address = addr;
+	I2C.enable(I2C.address);
+	//I2C.mode(I2C_FAST);
+}
+
+T_UBYTE _i2c_MMA8451_ID( )
+{
+	register int j;
+	
+	I2C.start(MMA8451.address);		
+	I2C.send( (T_UBYTE) MMA8451_WHO_AM_I );	// Upper data bits          (D11.D10.D9.D8.D7.D6.D5.D4)
+	I2C.end(0);
+	
+	//for(j = 0; j < 250; j++);
+	
+	I2C.requestFrom(MMA8451.address, 1);
+	
+	if(I2C.available())
+		return (T_UBYTE)I2C.read();
+	else
+		return 0x99;
+}
+
+
diff --git a/Sensors/MMA8451.h b/Sensors/MMA8451.h
new file mode 100644
index 0000000..ccbcb05
--- /dev/null
+++ b/Sensors/MMA8451.h
@@ -0,0 +1,41 @@
+#ifndef OSWARRIOR_MCP4725_H_
+	#define OSWARRIOR_MCP4725_H_
+
+	#define MMA8451_SA0_GND		    0x1C	// Address if A0 is connected to GND or not connected
+	#define MMA8451_SA0_VCC		    0x1D 	// Address if A0 is connected to VCC
+
+	#define MMA8451_WHO_AM_I		0x0D	// Writes data to the DAC
+	
+	#define MMA8451_OUT_X_MSB		0x01	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	#define MMA8451_OUT_X_LSB		0x02	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	
+	#define MMA8451_OUT_Y_MSB		0x03	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	#define MMA8451_OUT_Y_LSB		0x04	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	
+	#define MMA8451_OUT_Z_MSB		0x05	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	#define MMA8451_OUT_Z_LSB		0x06	// Writes data to the DAC and the EEPROM (persisting the assigned value after reset)
+	
+	/*
+	** ===================================================================
+	** Function prototypes	
+	** ===================================================================
+	*/
+
+	extern void _i2c_MMA8451_init(T_UBYTE addr);
+	extern T_UBYTE _i2c_MMA8451_ID(void);
+	
+	/*
+	** ===================================================================
+	** MCP4725 DAC Structure Definition
+	** ===================================================================
+	*/
+
+	typedef struct{
+		T_UBYTE address;
+		void (*init)(T_UBYTE addr);	
+		T_UBYTE (*queryID)(void);	
+	}MMA8451STR;	
+	
+	extern MMA8451STR MMA8451;
+
+#endif
diff --git a/Sensors/PCF8574.c b/Sensors/PCF8574.c
new file mode 100644
index 0000000..5ba4774
--- /dev/null
+++ b/Sensors/PCF8574.c
@@ -0,0 +1,38 @@
+#include "oswlib/settings.h"
+#include "oswlib/I2C/i2c.h"
+#include "oswlib/Sensors/PCF8574.h"
+
+PCF8574STR PCF8574 = {
+	PCF8574_ADD0,
+	_i2c_PCF8574_init, 		  
+	_i2c_PCF8574_write, 		   
+	_i2c_PCF8574_read, 		   
+};
+
+void _i2c_PCF8574_init(T_UBYTE addr)
+{
+	PCF8574.address = addr;
+	I2C.enable(I2C.address);
+	//I2C.mode(I2C_FAST);
+}
+
+void _i2c_PCF8574_write(T_UBYTE data)
+{
+	I2C.start(PCF8574.address);		
+	I2C.send(data);
+	I2C.end(1);
+	return;
+}
+
+T_UBYTE _i2c_PCF8574_read( )
+{
+
+	I2C.requestFrom(PCF8574.address, 1);		
+	
+	if(I2C.available())
+		return I2C.read();
+	else
+		return 0;
+}
+
+
diff --git a/Sensors/PCF8574.h b/Sensors/PCF8574.h
new file mode 100644
index 0000000..c105b13
--- /dev/null
+++ b/Sensors/PCF8574.h
@@ -0,0 +1,45 @@
+#ifndef OSWARRIOR_PCF8574_H_
+	#define OSWARRIOR_PCF8574_H_
+
+
+	/*
+	** ===================================================================
+	** Device addressing
+	** ===================================================================
+	*/	
+
+	#define PCF8574_ADD0		    0x20	// Address if A2 = 0, A1 = 0 y A0 = 0
+	#define PCF8574_ADD1		    0x21	// Address if A2 = 0, A1 = 0 y A0 = 1
+	#define PCF8574_ADD2		    0x22	// Address if A2 = 0, A1 = 1 y A0 = 0
+	#define PCF8574_ADD3		    0x23	// Address if A2 = 0, A1 = 1 y A0 = 1
+	#define PCF8574_ADD4		    0x24	// Address if A2 = 1, A1 = 0 y A0 = 0
+	#define PCF8574_ADD5		    0x25	// Address if A2 = 1, A1 = 0 y A0 = 1
+	#define PCF8574_ADD6		    0x26	// Address if A2 = 1, A1 = 1 y A0 = 0
+	#define PCF8574_ADD7		    0x27	// Address if A2 = 1, A1 = 1 y A0 = 1
+
+	/*
+	** ===================================================================
+	** Function prototypes	
+	** ===================================================================
+	*/
+
+	extern void _i2c_PCF8574_init(T_UBYTE);
+	extern void _i2c_PCF8574_write(T_UBYTE);
+	extern T_UBYTE _i2c_PCF8574_read(void);
+	
+	/*
+	** ===================================================================
+	** MCP4725 DAC Structure Definition
+	** ===================================================================
+	*/
+
+	typedef struct{
+		T_UBYTE address;
+		void (*init)(T_UBYTE addr);	
+		void (*write)(T_UBYTE);	
+		T_UBYTE (*read)(void);	
+	}PCF8574STR;	
+	
+	extern PCF8574STR PCF8574;
+
+#endif