diff --git a/master/master/config.h b/master/master/config.h
--- a/master/master/config.h
+++ b/master/master/config.h
@@ -28,7 +28,9 @@
 // SD Card
 #define ERROR_SD_INIT 2
 #define ERROR_SD_PARTITION 3
-#define ERROR_CRAP 6
+#define ERROR_SD_FILE 4
+
+#define ERROR_CRAP 15
 
 // --------------------------------------------------------------------------
 // Slave Sensors config (slavesensors.c)
diff --git a/master/master/lib/logger.c b/master/master/lib/logger.c
--- a/master/master/lib/logger.c
+++ b/master/master/lib/logger.c
@@ -64,6 +64,7 @@ void logger_setup()
 	if(!fs)
 	{
 		// opening filesystem failed
+		led_errorcode(ERROR_SD_PARTITION);
 		return;
 	}
 	
@@ -75,6 +76,7 @@ void logger_setup()
 	{
 		// opening root directory failed
 		_delay_ms(10);
+		led_errorcode(ERROR_SD_FILE);
 		return;
 	}
 	
@@ -87,7 +89,9 @@ void logger_setup()
 	sprintf(filename, "data%d.csv",++logid);
 	
 	// TODO: Catch errors here
-	fat_create_file(dd, filename, &directory);
+	if(!fat_create_file(dd, filename, &directory)) {
+		led_errorcode(ERROR_SD_FILE);
+	}		
 		
 	eeprom_update_byte(LOGGER_ID_EEPROM_ADDR, logid);
 
@@ -95,6 +99,7 @@ void logger_setup()
 	fd = open_file_in_dir(fs, dd, filename);
 	if(!fd)
 	{
+		led_errorcode(ERROR_SD_FILE);
 		_delay_ms(10);
 		return;
 	}
@@ -105,6 +110,7 @@ void logger_setup()
 	if(!fat_seek_file(fd, &offset, FAT_SEEK_SET))
 	{
 		// Error seeking to file
+		led_errorcode(ERROR_SD_FILE);
 		_delay_ms(10);
 		fat_close_file(fd);
 		return;
diff --git a/master/master/lib/serial.c b/master/master/lib/serial.c
--- a/master/master/lib/serial.c
+++ b/master/master/lib/serial.c
@@ -15,6 +15,7 @@
 #include "../config.h"
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include <avr/wdt.h>
 
 // NOTE: USART ISRs for character reception are included in serparser.c
 
@@ -65,6 +66,14 @@ void serial1_ioff() {
 	UCSR1B &= ~(1 << RXCIE1); // Disable interrupt
 }
 
+void serial0_ion() {
+	UCSR0B |= (1 << RXCIE0); // Enable interrupt
+}
+void serial0_ioff() {
+	UCSR0B &= ~(1 << RXCIE0); // Disable interrupt
+}
+
+
 void serial0_sendChar( unsigned char byte )
 {
 	while (!(UCSR0A & (1<<UDRE0)));
@@ -77,6 +86,40 @@ void serial1_sendChar( unsigned char byt
 	UDR1 = byte;
 }
 
+
+unsigned char serial0_readChar()
+{
+	while(!(UCSR0A &(1<<RXC0)));
+	//char c = UDR0;
+	//serial0_sendString("Read: ");
+	//serial0_sendChar(c);
+	//serial0_sendChar('\n');
+	return UDR0;
+}
+
+uint8_t serial0_hasChar() {
+	return (UCSR0A &(1<<RXC0));
+}
+
+char readBuf[128];
+char* serial0_readLine() {
+	char c;
+	
+	int i = 0;
+	
+	while(i < 128) {
+		c = serial0_readChar();
+
+		if(c == 0x0D) break;
+		readBuf[i] = c;
+		i++;
+	}
+	
+	readBuf[i] = '\0';
+	return readBuf;
+}
+
+
 void serial0_sendString(const char* stringPtr){
 	while(*stringPtr != 0x00)
 	{
diff --git a/master/master/lib/serial.h b/master/master/lib/serial.h
--- a/master/master/lib/serial.h
+++ b/master/master/lib/serial.h
@@ -28,6 +28,10 @@ void serial1_setup();
 void serial0_sendString(const char* stringPtr);
 void serial1_sendString(const char* stringPtr);
 
+unsigned char serial0_readChar();
+uint8_t serial0_hasChar();
+char* serial0_readLine();
+
 void serial_sendCommand( char moduleID, char sensorID, char* data );
 void serial_sendResponseData();
 
diff --git a/master/master/lib/slavesensors.c b/master/master/lib/slavesensors.c
--- a/master/master/lib/slavesensors.c
+++ b/master/master/lib/slavesensors.c
@@ -16,6 +16,9 @@
 #include "serial.h"
 #include "serparser.h"
 #include "slavesensors.h"
+#include "led.h"
+#include <util/delay.h>
+#include <avr/wdt.h>
 
 uint8_t currentSlave = 0;
 uint8_t currentSlaveSensor = 0;
@@ -57,6 +60,87 @@ void slavesensors_setup()
 	
 }
 
+char* bufPtr = 0x00;
+void slavesensors_network_scan() {
+	serial0_ioff();
+	
+	int atOK;
+	
+	serial0_sendString("Beginning network scan...\r\n");
+	
+	// Delay guard period
+	_delay_ms(500);
+	_delay_ms(500);
+	
+	// Enter AT mode
+	serial0_sendChar('+'); // Enter AT mode
+	serial0_sendChar('+');
+	serial0_sendChar('+');
+	
+	while(!serial0_hasChar()) {
+		wdt_reset();
+	}
+	bufPtr = serial0_readLine();
+	
+	char nameString[20] = "NONE";
+	
+	// wait for OK
+	//todo
+	if(strcmp(bufPtr, "OK") == 0)
+	{
+		atOK = 1;
+		
+		serial0_sendString("ATND");
+		serial0_sendChar(0x0D);
+		// wait for scan to complete
+		while(!serial0_hasChar()) {
+			wdt_reset();
+		}
+		
+		// Scan data end when newline by itself ("")	
+		int lineCount = 0;	
+		while(1) {
+			bufPtr = serial0_readLine();
+			if(lineCount == 3) {
+				strcpy(nameString, bufPtr);
+			}
+			if(strcmp(bufPtr, "") == 0)
+				break;
+			lineCount++;
+		}		
+		// Exit AT
+		serial0_sendString("ATCN");
+		serial0_sendChar(0x0D);
+
+	}
+	else {
+		atOK = 0;
+	}
+	_delay_ms(200);
+	//serial0_sendString("ATND"); // Scan all nodes
+	
+
+	 
+	 led_on(LED_SIDEBOARD);
+	 _delay_ms(500);
+
+	serial0_sendString("First found node is: ");
+	serial0_sendString(nameString);
+	serial0_sendString("\r\n");
+	
+	if(atOK != 1) {
+		serial0_sendString("AT mode failed \r\n");
+	}
+	
+	
+	// Wait for response
+	// will be multiple values separated by <CR>
+	// 9 data lines per node, <CR> terminated, followed by a new line with only <CR> at the end of all nodes.
+	
+	// <CR> followed by another <CR> signifies end of scan data
+	serial0_ion();
+}
+
 bool slavesensors_isrequesting() 
 {
 	return requesting;	
@@ -76,7 +160,6 @@ void slavesensors_request()
 
 void slavesensors_process(uint8_t parseResult) 
 {
-	
 	if(!requesting) {
 		// we got a command when we didn't request anything. probably skip it.
 		return;
diff --git a/master/master/lib/slavesensors.h b/master/master/lib/slavesensors.h
--- a/master/master/lib/slavesensors.h
+++ b/master/master/lib/slavesensors.h
@@ -32,6 +32,7 @@ enum sensorTypes // CMD ID#
 
 bool slavesensors_isrequesting();
 void slavesensors_setup();
+void slavesensors_network_scan();
 void slavesensors_startprocess();
 void slavesensors_request();
 void slavesensors_process(uint8_t parseResult);
diff --git a/master/master/master.c b/master/master/master.c
--- a/master/master/master.c
+++ b/master/master/master.c
@@ -58,6 +58,8 @@ int main(void)
 	serial0_sendString("---------------------------------\r\n");
 	serial0_sendString("\r\nHello.\r\n\r\n");
 	
+	slavesensors_network_scan();
+	
 	led_on(LED_POWER);
 	led_off(LED_SIDEBOARD);
 	
@@ -129,7 +131,7 @@ int main(void)
 			// Print out GPS debug
 			snprintf(debugBuf, 128, "GPS> time: %s lat: %s lon: %s speed: %s hdop: %s course: %s\r\n",
 			get_timestamp(),get_latitude(),get_longitude(),get_speedKnots(),get_hdop(), get_course());
-			serial0_sendString(debugBuf);
+			//serial0_sendString(debugBuf);
 			
 			
 			sensors_readBoardTemp(); // i2c read, 400k
@@ -137,8 +139,8 @@ int main(void)
 			logger_log(logbuf);
 			
 			// Print out logger debug
-			serial0_sendString("LOG> ");
-			serial0_sendString(logbuf);
+			//serial0_sendString("LOG> ");
+			//serial0_sendString(logbuf);
 			
 			led_off(LED_CYCLE);
 			lastLog = time_millis();