diff --git a/Marlin/watchdog.cpp b/Marlin/watchdog.cpp
new file mode 100644
index 000000000..0adf9cc7d
--- /dev/null
+++ b/Marlin/watchdog.cpp
@@ -0,0 +1,48 @@
+#ifdef USE_WATCHDOG
+
+#include  <avr/wdt.h>
+#include  <avr/interrupt.h>
+
+volatile uint8_t timeout_seconds=0;
+
+void(* ctrlaltdelete) (void) = 0; //does not work on my atmega2560
+
+//Watchdog timer interrupt, called if main program blocks >1sec
+ISR(WDT_vect) 
+{ 
+  if(timeout_seconds++ >= WATCHDOG_TIMEOUT)
+  {
+ 
+    #ifdef RESET_MANUAL
+      LCD_MESSAGE("Please Reset!");
+      ECHOLN("echo_: Something is wrong, please turn off the printer.");
+    #else
+      LCD_MESSAGE("Timeout, resetting!");
+    #endif 
+    //disable watchdog, it will survife reboot.
+    WDTCSR |= (1<<WDCE) | (1<<WDE);
+    WDTCSR = 0;
+    #ifdef RESET_MANUAL
+      kill(); //kill blocks
+      while(1); //wait for user or serial reset
+    #else
+      ctrlaltdelete();
+    #endif
+  }
+}
+
+/// intialise watch dog with a 1 sec interrupt time
+void wd_init() 
+{
+  WDTCSR = (1<<WDCE )|(1<<WDE ); //allow changes
+  WDTCSR = (1<<WDIF)|(1<<WDIE)| (1<<WDCE )|(1<<WDE )|  (1<<WDP2 )|(1<<WDP1)|(0<<WDP0);
+}
+
+/// reset watchdog. MUST be called every 1s after init or avr will reset.
+void wd_reset() 
+{
+  wdt_reset();
+  timeout_seconds=0; //reset counter for resets
+}
+
+#endif /* USE_WATCHDOG */
diff --git a/Marlin/watchdog.h b/Marlin/watchdog.h
new file mode 100644
index 000000000..2577bc138
--- /dev/null
+++ b/Marlin/watchdog.h
@@ -0,0 +1,10 @@
+#ifndef __WATCHDOGH
+#define __WATCHDOGH
+#ifdef
+/// intialise watch dog with a 1 sec interrupt time
+void wd_init();
+/// pad the dog/reset watchdog. MUST be called at least every second after the first wd_init or avr will go into emergency procedures..
+void wd_reset();
+
+
+#endif