diff --git a/DCCTimer.h b/DCCTimer.h
index fb8184b..04d171f 100644
--- a/DCCTimer.h
+++ b/DCCTimer.h
@@ -121,6 +121,9 @@ private:
 #elif defined(ARDUINO_ARCH_ESP32)
 #define ARDUINO_TYPE "ESP32"
 #undef HAS_AVR_WDT
+#elif defined(ARDUINO_ARCH_SAMD)
+#define ARDUINO_TYPE "SAMD21"
+#undef HAS_AVR_WDT
 #else
 #error CANNOT COMPILE - DCC++ EX ONLY WORKS WITH THE ARCHITECTURES LISTED IN DCCTimer.h
 #endif
diff --git a/defines.h b/defines.h
index 9ce154d..c24d6af 100644
--- a/defines.h
+++ b/defines.h
@@ -40,7 +40,7 @@
 // WIFI_ON: All prereqs for running with WIFI are met
 // Note: WIFI_CHANNEL may not exist in early config.h files so is added here if needed.
 
-#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_SAMD_ZERO) || defined(TEENSYDUINO) || defined(ARDUINO_AVR_NANO_EVERY) || defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
+#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_SAMD_ZERO) || defined(TEENSYDUINO) || defined(ARDUINO_AVR_NANO_EVERY) || defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_SAMD)
  #define BIG_RAM
 #endif 
 #if ENABLE_WIFI