diff --git a/README.md b/README.md
index 7d0a8c15..864cee17 100644
--- a/README.md
+++ b/README.md
@@ -207,7 +207,10 @@ There in the sensor configuration select "TheThingsNetwork" and set Decoding Pro
 # SD-card
 Data can be stored on an SD-card if one is availabe. Simply choose the file in src/hal and add the following lines to your hal-file:
 
-    #define HAS_SDCARD 1     // this board has an SD-card-reader/writer
+    #define HAS_SDCARD 1     // this board has an SD-card-reader/writer, with SPI interface
+	OR
+	#define HAS_SDCARD 2     // this board has an SD-card-reader/writer, using native SD interface
+
     // Pins for SD-card
     #define SDCARD_CS   (13) // fill in the correct numbers for your board
     #define SDCARD_MOSI (15)
diff --git a/include/sdcard.h b/include/sdcard.h
index 4323c6a3..8157bb32 100644
--- a/include/sdcard.h
+++ b/include/sdcard.h
@@ -4,14 +4,37 @@
 #include <globals.h>
 #include <stdio.h>
 #include <SPI.h>
+
+#if HAS_SDCARD == 1
 #include <mySD.h>
+#elif HAS_SDCARD == 2
+#include <SD_MMC.h>
+#else
+#error HAS_SDCARD unknown card reader value, must be either 1 or 2
+#endif
 
 #include "sds011read.h"
 
-#define SDCARD_FILE_NAME       "paxcount.%02d"
-#define SDCARD_FILE_HEADER     "date, time, wifi, bluet"
+#ifndef SDCARD_CS
+#define SDCARD_CS SS
+#endif
 
-bool sdcard_init( void );
-void sdcardWriteData( uint16_t, uint16_t);
+#ifndef SDCARD_MOSI
+#define SDCARD_MOSI MOSI
+#endif
+
+#ifndef SDCARD_MISO
+#define SDCARD_MISO MISO
+#endif
+
+#ifndef SDCARD_SCLK
+#define SDCARD_SCLK SCK
+#endif
+
+#define SDCARD_FILE_NAME "/paxcount.%02d"
+#define SDCARD_FILE_HEADER "date, time, wifi, bluet"
+
+bool sdcard_init(void);
+void sdcardWriteData(uint16_t, uint16_t);
 
 #endif
diff --git a/src/sdcard.cpp b/src/sdcard.cpp
index 5faab5cd..3b573c70 100644
--- a/src/sdcard.cpp
+++ b/src/sdcard.cpp
@@ -14,12 +14,19 @@ static void createFile(void);
 File fileSDCard;
 
 bool sdcard_init() {
-  ESP_LOGD(TAG, "looking for SD-card...");
+  ESP_LOGI(TAG, "looking for SD-card...");
+#if HAS_SDCARD == 1
+  pinMode(SS, OUTPUT);
   useSDCard = SD.begin(SDCARD_CS, SDCARD_MOSI, SDCARD_MISO, SDCARD_SCLK);
-  if (useSDCard)
+#elif HAS_SDCARD == 2
+  useSDCard = SD_MMC.begin();
+#endif
+
+  if (useSDCard) {
+    ESP_LOGI(TAG, "SD-card found");
     createFile();
-  else
-    ESP_LOGD(TAG, "SD-card not found");
+  } else
+    ESP_LOGI(TAG, "SD-card not found");
   return useSDCard;
 }
 
@@ -64,10 +71,22 @@ void createFile(void) {
   for (int i = 0; i < 100; i++) {
     sprintf(bufferFilename, SDCARD_FILE_NAME, i);
     ESP_LOGD(TAG, "SD: looking for file <%s>", bufferFilename);
+
+#if HAS_SDCARD == 1
     bool fileExists = SD.exists(bufferFilename);
+#elif HAS_SDCARD == 2
+    bool fileExists = SD_MMC.exists(bufferFilename);
+#endif
+
     if (!fileExists) {
       ESP_LOGD(TAG, "SD: file does not exist: opening");
+
+#if HAS_SDCARD == 1
       fileSDCard = SD.open(bufferFilename, FILE_WRITE);
+#elif HAS_SDCARD == 2
+      fileSDCard = SD_MMC.open(bufferFilename, FILE_WRITE);
+#endif
+
       if (fileSDCard) {
         ESP_LOGD(TAG, "SD: name opened: <%s>", bufferFilename);
         fileSDCard.print(SDCARD_FILE_HEADER);