diff --git a/emulator/config.dist.h b/emulator/config.dist.h
new file mode 100644
index 0000000..f9f4600
--- /dev/null
+++ b/emulator/config.dist.h
@@ -0,0 +1,75 @@
+/**
+ * You can either configure everything in this file,
+ *  or include one of the predefined configurations
+ * Just copy your variant of config.dist.h to config.h
+ */
+//#include "configs/uno.h"
+//#include "configs/promicro.h"
+
+// SOFTWARE CONFIG
+/**
+ * Enable MDC and/or CDC.
+ * Just define MDC and/or CDC
+ */
+#define MDC
+//#define CDC
+
+/**
+ * Enable serial output
+ */
+//#define ENABLE_SERIAL
+
+// HARDWARE CONFIG
+
+/**
+ * Pin Configuration:
+ *  Use pins on the same port. I.e., use ATmega PINs:
+ *  Pnd for Data
+ *  Pnc for Clock (needs to support interrupts!)
+ *  Pnb for Busy
+ * 
+ * Than set DDRx, PORTx and PINx to the port n out of {A,B,C,D}
+ * The Pin numbers are d,c,b
+ * For the clock, we also need the interrupt number and name.
+ * You can look these things up in your boards pin mapping online
+ * 
+ * My config on a Sparkfun Pro Micro:
+ *  DATA: Digital Pin 2 = PD1 (SDA/INT1)
+ *   CLK: Digital Pin 3 = PD0 (OC0B/SCL/INT0)
+ *  BUSY: Digital Pin 4 = PD4 (ICP1/ADC8)
+ * 
+ * -> Port D, DATA on 1, CLK on 0, BUSY on 4.
+ * -> Clock is on INT0
+ * 
+ * Arduino Code was too slow, so this is done the fast way
+ */
+//#define DDRx DDRD
+//#define PORTx PORTD
+//#define PINx PIND
+//#define DATA_PIN 1
+//#define BUSY_PIN 4
+//#define CLK_PIN 0
+//#define CLK_INT 0
+//#define CLK_INTx INT0
+
+/**
+ * This macro controls a LED to signal error [perma on] or init/signaling [blink]
+ * For the pro micro it's predefined in the default header files,
+ *  but you might want to write one for other boards
+ * 
+ * LED blink for 1s -> signaling presence
+ * LED on -> processing was too low
+ */
+//#define RXLED1 digitalWrite (your_led_pin, HIGH)
+//#define RXLED0 digitalWrite (your_led_pin, LOW)
+
+/**
+ * This macro controls a LED to signal communication
+ * For the pro micro it's predefined in the default header files,
+ *  but you might want to write one for other boards
+ * 
+ * LED on  -> no data to process (but we saw the master)
+ * LED off -> processing data
+ */
+//#define TXLED1 digitalWrite (your_led_pin, HIGH)
+//#define TXLED0 digitalWrite (your_led_pin, LOW)
diff --git a/emulator/config_promicro.h b/emulator/config_promicro.h
new file mode 100644
index 0000000..73c2571
--- /dev/null
+++ b/emulator/config_promicro.h
@@ -0,0 +1,21 @@
+//make sure to include just a single config file
+#ifndef CONFIGURED
+#define CONFIGURED
+#else
+#error JUST INCLUDE A SINGLE CONFIG FILE
+#endif
+
+/**
+ * My config on a Sparkfun Pro Micro:
+ *  DATA: Digital Pin 2 = PD1 (SDA/INT1)
+ *   CLK: Digital Pin 3 = PD0 (OC0B/SCL/INT0)
+ *  BUSY: Digital Pin 4 = PD4 (ICP1/ADC8)
+ */
+#define DDRx DDRD
+#define PORTx PORTD
+#define PINx PIND
+#define DATA_PIN 1
+#define BUSY_PIN 4
+#define CLK_PIN 0
+#define CLK_INT 0
+#define CLK_INTx INT0
diff --git a/emulator/config_uno.h b/emulator/config_uno.h
new file mode 100644
index 0000000..2346514
--- /dev/null
+++ b/emulator/config_uno.h
@@ -0,0 +1,26 @@
+//make sure to include just a single config file
+#ifndef CONFIGURED
+#define CONFIGURED
+#else
+#error JUST INCLUDE A SINGLE CONFIG FILE
+#endif
+
+/**
+ * My config on a Arduino Uno/ATmega 168
+ *  DATA: Digital Pin 3 = PD3 (PCINT19/OC2B/INT1) OLD: PD1 (SDA/INT1)
+ *   CLK: Digital Pin 2 = PD2 (PCINT18/INT0)      OLD: PD0 (OC0B/SCL/INT0)
+ *  BUSY: Digital Pin 4 = PD4 (PCINT20/XCK/T0)    OLD: PD4 (ICP1/ADC8)
+ */
+#define DDRx DDRD
+#define PORTx PORTD
+#define PINx PIND
+#define DATA_PIN 3
+#define BUSY_PIN 4
+#define CLK_PIN 2
+#define CLK_INT 0
+#define CLK_INTx INT0
+
+#define TXLED0
+#define TXLED1
+#define RXLED0
+#define RXLED1
diff --git a/emulator/emulator.ino b/emulator/emulator.ino
index fd087bf..2b7b4b4 100644
--- a/emulator/emulator.ino
+++ b/emulator/emulator.ino
@@ -21,67 +21,10 @@
  */
 
 /**
- * Enable MDC and/or CDC.
- * Just define MDC and/or CDC
+ * Your configuration goes to config.h
+ * Take a look at config.dist.h for details
  */
-#define MDC
-//#define CDC
-
-/**
- * Pin Configuration:
- *  Use pins on the same port. I.e., use ATmega PINs:
- *  Pnd for Data
- *  Pnc for Clock (needs to support interrupts!)
- *  Pnb for Busy
- * 
- * Than set DDRx, PORTx and PINx to the port n out of {A,B,C,D}
- * The Pin numbers are d,c,b
- * For the clock, we also need the interrupt number and name.
- * You can look these things up in your boards pin mapping online
- * 
- * My config on a Sparkfun Pro Micro:
- *  DATA: Digital Pin 2 = PD1 (SDA/INT1)
- *   CLK: Digital Pin 3 = PD0 (OC0B/SCL/INT0)
- *  BUSY: Digital Pin 4 = PD4 (ICP1/ADC8)
- * 
- * -> Port D, DATA on 1, CLK on 0, BUSY on 4.
- * -> Clock is on INT0
- * 
- * Arduino Code was too slow, so this is done the fast way
- */
-#define DDRx DDRD
-#define PORTx PORTD
-#define PINx PIND
-#define DATA_PIN 1
-#define BUSY_PIN 4
-#define CLK_PIN 0
-#define CLK_INT 0
-#define CLK_INTx INT0
-
-/**
- * Enable serial output
- */
-//#define ENABLE_SERIAL
-
-/**
- * This macro controls a LED to signal error [perma on] or init/signaling [blink]
- * For the pro micro it's predefined, but you might want to write one for other boards
- * 
- * LED blink for 1s -> signaling presence
- * LED on -> processing was too low
- */
-//#define RXLED1 digitalWrite (your_led_pin, HIGH)
-//#define RXLED0 digitalWrite (your_led_pin, LOW)
-
-/**
- * This macro controls a LED to signal communication
- * For the pro micro it's predefined, but you might want to write one for other boards
- * 
- * LED on  -> no data to process (but we saw the master)
- * LED off -> processing data
- */
-//#define TXLED1 digitalWrite (your_led_pin, HIGH)
-//#define TXLED0 digitalWrite (your_led_pin, LOW)
+#include "config.h"
 
 #include "blink.h"
 #include "io.h"
@@ -202,4 +145,4 @@ bool SerialEvent () {
     }
     return false;
 }
-#endif
+#endif