diff --git a/CompileTime.h b/CompileTime.h
new file mode 100644
index 0000000..7f8d1b2
--- /dev/null
+++ b/CompileTime.h
@@ -0,0 +1,60 @@
+#define COMPUTE_BUILD_YEAR ( \
+    (__DATE__[ 7] - '0') * 1000 + \
+    (__DATE__[ 8] - '0') *  100 + \
+    (__DATE__[ 9] - '0') *   10 + \
+    (__DATE__[10] - '0') \
+)
+
+
+#define COMPUTE_BUILD_DAY ( \
+    ((__DATE__[4] >= '0') ? (__DATE__[4] - '0') * 10 : 0) + \
+    (__DATE__[5] - '0') \
+) 
+
+    
+#define BUILD_MONTH_IS_JAN (__DATE__[0] == 'J' && __DATE__[1] == 'a' && __DATE__[2] == 'n')
+#define BUILD_MONTH_IS_FEB (__DATE__[0] == 'F')
+#define BUILD_MONTH_IS_MAR (__DATE__[0] == 'M' && __DATE__[1] == 'a' && __DATE__[2] == 'r')
+#define BUILD_MONTH_IS_APR (__DATE__[0] == 'A' && __DATE__[1] == 'p')
+#define BUILD_MONTH_IS_MAY (__DATE__[0] == 'M' && __DATE__[1] == 'a' && __DATE__[2] == 'y')
+#define BUILD_MONTH_IS_JUN (__DATE__[0] == 'J' && __DATE__[1] == 'u' && __DATE__[2] == 'n')
+#define BUILD_MONTH_IS_JUL (__DATE__[0] == 'J' && __DATE__[1] == 'u' && __DATE__[2] == 'l')
+#define BUILD_MONTH_IS_AUG (__DATE__[0] == 'A' && __DATE__[1] == 'u')
+#define BUILD_MONTH_IS_SEP (__DATE__[0] == 'S')
+#define BUILD_MONTH_IS_OCT (__DATE__[0] == 'O')
+#define BUILD_MONTH_IS_NOV (__DATE__[0] == 'N')
+#define BUILD_MONTH_IS_DEC (__DATE__[0] == 'D')
+
+
+#define COMPUTE_BUILD_MONTH ( \
+    (BUILD_MONTH_IS_JAN) ?  1 : \
+    (BUILD_MONTH_IS_FEB) ?  2 : \
+    (BUILD_MONTH_IS_MAR) ?  3 : \
+    (BUILD_MONTH_IS_APR) ?  4 : \
+    (BUILD_MONTH_IS_MAY) ?  5 : \
+    (BUILD_MONTH_IS_JUN) ?  6 : \
+    (BUILD_MONTH_IS_JUL) ?  7 : \
+    (BUILD_MONTH_IS_AUG) ?  8 : \
+    (BUILD_MONTH_IS_SEP) ?  9 : \
+    (BUILD_MONTH_IS_OCT) ? 10 : \
+    (BUILD_MONTH_IS_NOV) ? 11 : \
+    (BUILD_MONTH_IS_DEC) ? 12 : \
+    /* error default */  99 \
+)
+
+#define COMPUTE_BUILD_HOUR ((__TIME__[0] - '0') * 10 + __TIME__[1] - '0')
+#define COMPUTE_BUILD_MIN  ((__TIME__[3] - '0') * 10 + __TIME__[4] - '0')
+#define COMPUTE_BUILD_SEC  ((__TIME__[6] - '0') * 10 + __TIME__[7] - '0')
+
+
+#define BUILD_DATE_IS_BAD (__DATE__[0] == '?')
+
+#define BUILD_YEAR  ((BUILD_DATE_IS_BAD) ? 99 : COMPUTE_BUILD_YEAR)
+#define BUILD_MONTH ((BUILD_DATE_IS_BAD) ? 99 : COMPUTE_BUILD_MONTH)
+#define BUILD_DAY   ((BUILD_DATE_IS_BAD) ? 99 : COMPUTE_BUILD_DAY)
+
+#define BUILD_TIME_IS_BAD (__TIME__[0] == '?')
+
+#define BUILD_HOUR  ((BUILD_TIME_IS_BAD) ? 99 :  COMPUTE_BUILD_HOUR)
+#define BUILD_MIN   ((BUILD_TIME_IS_BAD) ? 99 :  COMPUTE_BUILD_MIN)
+#define BUILD_SEC   ((BUILD_TIME_IS_BAD) ? 99 :  COMPUTE_BUILD_SEC)
diff --git a/Debug.h b/Debug.h
index 33ec14e..d781631 100644
--- a/Debug.h
+++ b/Debug.h
@@ -1,8 +1,6 @@
 #ifndef DEBUG_H
 #define DEBUG_H
 
-#define DEBUG
-
 #include <cstdint>
 
 extern "C" {
diff --git a/ext/rfid/MFRC522.cpp b/ext/rfid/MFRC522.cpp
new file mode 100644
index 0000000..0dcdee6
--- /dev/null
+++ b/ext/rfid/MFRC522.cpp
@@ -0,0 +1,30 @@
+#include "MFRC522.h"
+
+void MFRC522::init() {
+
+
+		debugMod(NAME, "init");
+
+		spi::init();
+
+		//os_delay_us(5000);
+
+		// Reset baud rates
+		writeReg8(Register::TX_MODE_REG, 0x00);
+		writeReg8(Register::RX_MODE_REG, 0x00);
+		// Reset ModWidthReg
+		writeReg8(Register::MOD_WIDTH_REG, 0x26);
+
+		writeReg8(Register::T_MODE_REG, 0x80);
+		writeReg8(Register::T_PRESCALER_REG, 0xA9);
+		writeReg8(Register::T_RELOAD_REG_L, 0xE8);
+		writeReg8(Register::T_RELOAD_REG_H, 0x03);
+		writeReg8(Register::TX_AUTO_REG, 0x40);
+		writeReg8(Register::MODE_REG, 0x3D);	// very important. set CRC preset to 0x6363 by setting bit 0 and clearing bit 1 in MODE_REG
+
+		antennaOn();
+
+		writeReg8(Register::COMMAND_REG, Command::IDLE);
+
+
+}
diff --git a/io/IO.h b/io/IO.h
index e74352b..b4c2af3 100644
--- a/io/IO.h
+++ b/io/IO.h
@@ -79,6 +79,10 @@ public:
 	}
 
 
+
+
+
+
 };
 
 #endif // IO_H