diff --git a/src/CAN.h b/src/CAN.h
index d8edc06..efa5c88 100644
--- a/src/CAN.h
+++ b/src/CAN.h
@@ -4,10 +4,14 @@
 #ifndef CAN_H
 #define CAN_H
 
+
 #ifdef ARDUINO_ARCH_ESP32
-#include "ESP32SJA1000.h"
-#else
-#include "MCP2515.h"
+//#include "ESP32SJA1000.h"
+#ifndef ESP32_EXTERNAL_CAN
+//#define IGNORE_MCP2515
+#endif
 #endif
 
+#include "MCP2515.h"
+
 #endif
diff --git a/src/MCP2515.cpp b/src/MCP2515.cpp
index 1d451ba..4529453 100644
--- a/src/MCP2515.cpp
+++ b/src/MCP2515.cpp
@@ -1,7 +1,7 @@
 // Copyright (c) Sandeep Mistry. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-#ifndef ARDUINO_ARCH_ESP32
+#ifndef IGNORE_MCP2515
 
 #include "MCP2515.h"
 
@@ -328,6 +328,7 @@ int MCP2515Class::parsePacket()
   return _rxDlc;
 }
 
+
 void MCP2515Class::onReceive(void(*callback)(int))
 {
   CANControllerClass::onReceive(callback);
@@ -335,8 +336,8 @@ void MCP2515Class::onReceive(void(*callback)(int))
   pinMode(_intPin, INPUT);
 
   if (callback) {
-    SPI.usingInterrupt(digitalPinToInterrupt(_intPin));
-    attachInterrupt(digitalPinToInterrupt(_intPin), MCP2515Class::onInterrupt, LOW);
+    //SPI.usingInterrupt(digitalPinToInterrupt(_intPin));
+    //attachInterrupt(digitalPinToInterrupt(_intPin), MCP2515Class::onInterrupt, LOW);
   } else {
     detachInterrupt(digitalPinToInterrupt(_intPin));
 #ifdef SPI_HAS_NOTUSINGINTERRUPT
@@ -345,6 +346,7 @@ void MCP2515Class::onReceive(void(*callback)(int))
   }
 }
 
+
 int MCP2515Class::filter(int id, int mask)
 {
   id &= 0x7ff;
@@ -705,11 +707,5 @@ void MCP2515Class::writeRegister(uint8_t address, uint8_t value)
   SPI.endTransaction();
 }
 
-void MCP2515Class::onInterrupt()
-{
-  CAN.handleInterrupt();
-}
-
-MCP2515Class CAN;
 
 #endif
diff --git a/src/MCP2515.h b/src/MCP2515.h
index 40a1334..a7fb64b 100644
--- a/src/MCP2515.h
+++ b/src/MCP2515.h
@@ -1,7 +1,7 @@
 // Copyright (c) Sandeep Mistry. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
-#ifndef ARDUINO_ARCH_ESP32
+//#ifndef IGNORE_MCP2515
 
 #ifndef MCP2515_H
 #define MCP2515_H
@@ -81,8 +81,6 @@ class MCP2515Class : public CANControllerClass {
   void modifyRegister(uint8_t address, uint8_t mask, uint8_t value);
   void writeRegister(uint8_t address, uint8_t value);
 
-  static void onInterrupt();
-
 private:
   SPISettings _spiSettings;
   int _csPin;
@@ -90,8 +88,7 @@ class MCP2515Class : public CANControllerClass {
   long _clockFrequency;
 };
 
-extern MCP2515Class CAN;
 
 #endif
 
-#endif
+//#endif