diff --git a/firmware/v01/v01.ino b/firmware/v01/v01.ino
index 51086c1..29aa5b5 100644
--- a/firmware/v01/v01.ino
+++ b/firmware/v01/v01.ino
@@ -42,16 +42,20 @@ File myFile;
 #define sd_not_in 0					// SD card is not inserted
 #define sd_in 1						// SD card is inserted
 #define file_fail 2					// Can't write to file
+#define writing 3					// Write on the sd card
 #define load_off 0					// Turn off the load
 #define load_on 1					// Turn on the load
 #define off 0						// off is always zero
 #define on 1						// on is always one
+#define no 0						// no is always zero
+#define yes 1						// yes is alyays one
 //----------------------------------------------------------------
 
 
 // Variables --------------------------------------------------------------------------------------------------------------
 bool sd_rw = off;					// Holds the state of read/write of the card
 bool load_status = load_off;		// Holds the state of on/off of the load
+bool sd_inserted = no;				// Holds the stats if sd card is in or not
 int sd_status = sd_not_in;			// Holds information about the sd card
 
 int currentScreen = 0;				// Current display menu
@@ -62,7 +66,7 @@ String screens[numOfScreens][2] = {{"Voltage 1","Volts"}, {"Voltage 2","Volts"},
 
 String parameters_sd[2] = {"No","Yes"};									// String to display the sd card logging
 String parameters_load[2] = {"Off","On"};								// String to display the load state
-String sd_card[3] = {"Card missing","Card inserted","File Write fail"}; // String to display the sd card state
+String sd_card[4] = {"Card missing","Card inserted","File Write fail","Writing..."}; // String to display the sd card state
 float parameters[4];													// Parameters of the several voltages and current
 
 float denominator;
@@ -108,10 +112,12 @@ void setup()
 
 	if (SD.begin())				// Initiate SD card
 	{
-		sd_status = sd_in;		// If sd card is initiated successfully change variable status to sd_in
+		sd_status = sd_in;		// If sd card is initiated successfully change variable sd_in
+		sd_inserted = yes;		// and change variable sd_inserted to yes
 	}
 	else {
-		sd_status = sd_not_in;	// If sd card is not initiated change variable status to sd_not_in
+		sd_status = sd_not_in;	// If sd card is not initiated change variable to sd_not_in
+		sd_inserted = no;		// and change variable sd_inserted to no
 	}
 }
 
@@ -132,22 +138,35 @@ void loop()
 	parameters[voltage_2] = volt_pin(volt_2);			// Update voltage two value
 
 
-	if (sd_rw == on)									// If sd_rw value is turned on
+	if (sd_inserted == no)								// If sd_rw value is turned on
+	{
+		sd_status = sd_not_in;
+	}
+	else if (sd_rw == on)
 	{
 		myFile = SD.open("measure.txt", FILE_WRITE);	// Open file measure.txt for writing
 		if (myFile)										// if succeds
 		{
+			myFile.print("Batt voltage, ");
 			myFile.println(volt_pin(v_batt));			// Write to card battery voltage
+			myFile.print("Voltage one,  ");
 			myFile.println(volt_pin(volt_1));			// Write to card voltage one
+			myFile.print("Voltage two,  ");
 			myFile.println(volt_pin(volt_2));			// Write to card voltage two
 			myFile.println("");							// Write to card an empty line
 			myFile.close();								// Close file
+			sd_status = writing;
 		}
 		else
 		{
-			sd_status = file_fail;						//
+			sd_status = file_fail;
 		}
 	}
+	else
+	{
+		sd_status = sd_in;
+	}
+
 	printScreen();										// Refresh screen and print current menu and values
 	delay(5000);										// Repeat the main loop every 5 seconds
 }