diff --git a/slave/slave/config.h b/slave/slave/config.h
--- a/slave/slave/config.h
+++ b/slave/slave/config.h
@@ -34,8 +34,9 @@
  //I2C Addresses
  #define EEPROM_ADDR 0xA0		// Read 0xA1 - Write 0xA0
  #define BOARDTEMP_ADDR 0x90	// Read 0x91 - Write 0x90
- #define PRESSURE_ADDR 0xB1		//THIS VALUE IS WRONG
- #define HUMID_ADDR 0xB4		//THIS VALUE IS WRONG
+ #define PRESSURE_ADDR 0xEF		// Read 0xEF - Write 0xEE
+ #define HUMID_ADDR 0x27		// Read 0x27 - Write 0x26
+ #define LIGHT_ADDR 0x95		// Read 0x95 - Write 0x94
  #define RTC_ADDR 0xB2			//DEBUG [Used for testing]      // Read 0xA3 - Write 0xA2
 
 
diff --git a/slave/slave/lib/masterComm.c b/slave/slave/lib/masterComm.c
--- a/slave/slave/lib/masterComm.c
+++ b/slave/slave/lib/masterComm.c
@@ -14,47 +14,155 @@
 #include "serparser.h"
 #include "inputOutput.h"
 
+uint8_t dataTypes;
 char buff2[64];
 
-void masterComm_send()
+
+char masterComm_checksum(const char* stringPtr)
+{
+	char sum = 0;
+	while(*stringPtr != 0x00)
+	{
+		sum += *stringPtr;
+		stringPtr++;
+	}
+	return sum;
+}
+
+
+void masterComm_types()
 {
-	serial0_sendString("[@");
 	switch(io_getModuleId())
 	{
 		case 0:
 			// Generic
-			snprintf(buff2,64,"%u",DATATYPES_GENERIC);
+			dataTypes = DATATYPES_GENERIC;
 			break;
 			
 		case 1:
 			// Sensors
-			snprintf(buff2,64,"%u",DATATYPES_SENSOR);
+			dataTypes = DATATYPES_SENSOR;
 			break;
 			
 		case 2:
 			// Geiger
-			snprintf(buff2,64,"%u",DATATYPES_GEIGER);
+			dataTypes = DATATYPES_GEIGER;
 			break;
 			
 		case 3:
 			// Camera
-			snprintf(buff2,64,"%u",DATATYPES_CAMERA);
+			dataTypes = DATATYPES_CAMERA;
 			break;
 			
 		default:
-			snprintf(buff2,64,"%u",DATATYPES_GENERIC);
+			dataTypes = DATATYPES_GENERIC;
 			break;
-	}
-	
-	serial0_sendString(buff2);
-
-
-	
-	serial0_sendString("got data\r\n");
+	}
 }
 
 
-void masterComm_check()
+void masterComm_modules()
+{
+	// Send BoardTemperature (Common for all modules)
+	serial0_sendString("[");
+	snprintf(buff2,64,"1%u",sensors_getBoardTemp());
+	serial0_sendString(buff2);
+	serial0_sendString("]");	
+	serial0_sendString(masterComm_checksum(buff2));	
+	
+	// Send module specific sensor readings
+	switch(io_getModuleId())
+	{
+		case 0:
+			// Generic
+			
+			break;
+		
+		case 1:
+			// Sensors
+			
+			// Send SPI Temperature (Air)
+			serial0_sendString("[");
+			snprintf(buff2,64,"2%u",sensors_getSpiTemp());
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+			
+			// Send Ambient Light (Needs to be formatted)
+			serial0_sendString("[");
+			snprintf(buff2,64,"3%u",geiger_getCpm());		//FIX
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+			
+/*			
+			// Send CPM (radiation)
+			serial0_sendString("[");
+			snprintf(buff2,64,"7%u",geiger_getCpm());
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+		
+			// Send CPM (radiation)
+			serial0_sendString("[");
+			snprintf(buff2,64,"7%u",geiger_getCpm());
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+		
+			// Send CPM (radiation)
+			serial0_sendString("[");
+			snprintf(buff2,64,"7%u",geiger_getCpm());
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+*/
+			
+			break;
+			
+		case 2:
+			// Geiger
+			
+			// Send CPM (radiation)
+			serial0_sendString("[");
+			snprintf(buff2,64,"7%u",geiger_getCpm());
+			serial0_sendString(buff2);
+			serial0_sendString("]");
+			serial0_sendString(masterComm_checksum(buff2));
+			
+			break;
+		
+		case 3:
+			// Camera
+			
+			break;
+		
+		default:
+			
+			break;
+	}
+}
+
+
+void masterComm_send()
+{
+	masterComm_types();		// Calculates how many data types to send
+	
+	// Return resquest with number of data types to be sent
+	serial0_sendString("[");						// Send opening bracket
+	snprintf(buff2,64,"@%u",dataTypes);				// Send package (@ reply and number of data types)
+	serial0_sendString(buff2);
+	serial0_sendString("]");						// Send closing bracket
+	serial0_sendString(masterComm_checksum(buff2));	// Calculate and send checksum
+	
+	masterComm_modules();	// Send sensor data
+	
+	
+	serial0_sendString("got request\r\n");		//DEBUG
+}
+
+
+void masterComm_checkParser()
 {
 	if (serparser_parse() == PARSERESULT_PARSEOK)
 	{
diff --git a/slave/slave/lib/masterComm.h b/slave/slave/lib/masterComm.h
--- a/slave/slave/lib/masterComm.h
+++ b/slave/slave/lib/masterComm.h
@@ -8,9 +8,12 @@
 #ifndef MASTERCOMM_H_
 #define MASTERCOMM_H_
 
-
+char masterComm_checksum(const char* stringPtr);
 
-void masterComm_check();	// Runs parser and checks for data request
+void masterComm_types();	// Calculates the number of types the module has
+void masterComm_modules();	// Sends sensor data depending on module
+
+void masterComm_checkParser();	// Runs parser and checks for data request
 void masterComm_send();		// Sends data after being requested
 
 
diff --git a/slave/slave/lib/sensors.c b/slave/slave/lib/sensors.c
--- a/slave/slave/lib/sensors.c
+++ b/slave/slave/lib/sensors.c
@@ -17,6 +17,9 @@
 
 int16_t	spiTemp;	// Thermocouple Temperature (from spi)
 int8_t	boardTemp;	// Board Temperature (from i2c)
+uint16_t pressure;	// Pressure (from i2c)
+//int humid;		// Humidity (from i2c)
+uint8_t light;		// Lux reading (from i2c)
 
 
 void sensors_readSpiTemp()
@@ -52,6 +55,33 @@ void sensors_readBoardTemp()
 	boardTemp = boardTemp - 3;						// Linear offset
 }
 
+void sensors_readPressure()
+{//needs editing
+	pressure = i2c_read(PRESSURE_ADDR, 0xF6);
+	pressure = pressure << 8;
+	pressure = pressure | i2c_read(PRESSURE_ADDR, 0xF7);
+}
+
+void sensors_readHumid()
+{
+	//humid = i2c_read(HUMID_ADDR, 0xXX);
+}
+
+void sensors_readLight()
+{
+	light = i2c_read(LIGHT_ADDR, 0x03);
+	// light = light << 4;
+	// light = light | (0x0F & i2c_read(LIGHT_ADDR, 0x04));  //  This can be used to read in the 4 LSBs from the second register
+	// FOR FIRST BYTE:
+	// Lux = 2^(exponent)*mantissa*0.72
+	// exponent = 8xE3 + 4xE2 + 2xE1 + E0
+	// mantissa = 8xM7 + 4xM6 + 2xM5 + M4
+	// FOR BOTH BYTES:
+	// Lux = 2^(exponent)*mantissa*0.045
+	// exponent = 8xE3 + 4xE2 + 2xE1 + E0
+	// mantissa = 128xM7 + 64xM6 + 32xM5 + 16xM4 + 8xM3 + 4xM2 + 2xM1 + M0
+}
+
 int16_t sensors_getSpiTemp(void)	// Gets spi temperature from variable
 {
 	return spiTemp;
@@ -62,3 +92,17 @@ int8_t sensors_getBoardTemp(void)	// Get
 	return boardTemp;
 }
 
+uint16_t sensors_getPressure(void)
+{
+	return pressure;
+}
+
+//int sensors_getHumid(void)
+//{
+	//return humid;
+//}
+
+uint8_t sensors_getLight(void)
+{
+	return light;
+}
\ No newline at end of file
diff --git a/slave/slave/lib/sensors.h b/slave/slave/lib/sensors.h
--- a/slave/slave/lib/sensors.h
+++ b/slave/slave/lib/sensors.h
@@ -12,8 +12,14 @@
 
 void sensors_readSpiTemp(void);		// Reads spi temperature
 void sensors_readBoardTemp(void);	// Reads board temperature
+void sensors_readPressure(void);	// Reads pressure
+void sensors_readHumid(void);		// Reads humidity
+void sensors_readLight(void);		// Reads lux
 
 int16_t sensors_getSpiTemp(void);	// Gets spi temperature from variable
 int8_t sensors_getBoardTemp(void);	// Gets board temperature from variable
+uint16_t sensors_getPressure(void);	// Gets pressure from variable
+//int sensors_getHumid(void);	// Gets humidity from variable
+uint8_t sensors_getLight(void);		// Gets lux from variable
 
 #endif /* SENSORS_H_ */
\ No newline at end of file
diff --git a/slave/slave/slave.cproj b/slave/slave/slave.cproj
--- a/slave/slave/slave.cproj
+++ b/slave/slave/slave.cproj
@@ -20,7 +20,7 @@
     <OverrideVtor>false</OverrideVtor>
     <OverrideVtorValue />
     <eraseonlaunchrule>0</eraseonlaunchrule>
-    <AsfVersion>3.1.3</AsfVersion>
+    <AsfVersion>2.11.1</AsfVersion>
     <avrtoolinterface>ISP</avrtoolinterface>
     <avrtool>com.atmel.avrdbg.tool.ispmk2</avrtool>
     <com_atmel_avrdbg_tool_simulator>