diff --git a/README.md b/README.md
index 0550f54..e6c312e 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,62 @@ CLK -> 18 (D5)
 MISO -> 19 (D6)
 ```
 
+### RFID Reader
+
+```
+
+```
+
+#### Registers
+
+```
+Writing 0x7F to the "ComIEnReg" means the following:
+
+    Bit 7: IRqInv=0 - Interrupts are active high
+    Bit 6: TxIEn=1 - Transmitter interrupt is enabled
+    Bit 5: RxIEn=1 - Receive interrupt is enabled
+    Bit 4: IdleIEn=1 - Idle interrupt is enabled
+    Bit 3: HiAlertIEn=1 - "High Alert" interrupt is enabled
+    Bit 2: LoAlertIEn=1 - "Low Alert" interrupt is enabled
+    Bit 1: ErrIEn=1 - Error interrupt is enabled
+    Bit 0: TimerIEn=1 - Timer interrupt is enabled
+
+The bits in the register "ComIrqReg" have the following meaning:
+
+    Bit 7: Set1 - when written as 1, a bit value of 1 in bits 6-0 of the byte written set the corresponding register bit; when written as 0, bits 6-0 clear the corresponding register bit
+    Bit 6: TxIRq - Set when the last bit of Tx data has been sent
+    Bit 5: RxIRq - Set when the receiver detects the end of a valid data stream
+    Bit 4: IdleIRq - Set when the CommandReg changes the command field to the idle command
+    Bit 3: HiAlertIRq - Set when the Status1 register HiAlert bit is set
+    Bit 2: LoAlertIRq - Set when the Status1 register LoAlert bit is set
+    Bit 1: ErrIRq - Set when any bit in ErrorReg gets set
+    Bit 0: TimerIRq - Set when the TCounterValReg decrements to zero
+
+Writing 0x14 to the "DivIEnReg" has the following meaning:
+
+    Bit 7: IRQPushPull=0 - IRQ is an open-drain output pin
+    Bit 6: reserved=0 - no known effect
+    Bit 5: reserved=0 - effect unknown
+    Bit 4: MfinActEn=1 - Allow the MFIN active interrupt request to trigger IRQ
+    Bit 3: reserved=0 - boundedly undefined
+    Bit 2: CRCIEn=1 - Permit the "DivIrqReg" bit CRCIRq to trigger IRQ
+    Bit 1: reserved=0 - do not set to 1 on pain of nothing
+    Bit 0: reserved=0 - has no purpose other than to confuse
+
+The register "DivIrqReg" corresponds to "DivIrqEn", and has the following bit definitions:
+
+    Bit 7: Set2 - when written as 1, a bit value of 1 in bits 6-0 of the byte written set the corresponding register bit; when written as 0, bits 6-0 clear the corresponding register bit
+    Bit 6: reserved - don't ask
+    Bit 5: reserved - don't tell
+    Bit 4: MfinActIRq - MFIN is active
+    Bit 3: reserved - just leave it at zero and back away slowly
+    Bit 2: CRCIRq - when 1, the CalcCRC command is active and all data is processed
+    Bit 1: reserved - nothing to see here
+    Bit 0: reserved - are you feeling lucky, punk?
+```
+
+
+
 ## Buttons
 
 ```
diff --git a/src/main.cpp b/src/main.cpp
index ee15673..b4aca4f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -43,7 +43,7 @@ File mp3File;
 
 Audio audio;
 
-uint volume = 18;
+uint volume = 12;
 
 AsyncWebServer server(80);
 DNSServer dns;
@@ -95,8 +95,10 @@ void playNextMp3()
   String mp3File = currentNode->getCurrentPlayingFilePath();
   Serial.println(mp3File.c_str());
   deactivateRFID();
+  activateSD();
   audio.connecttoSD(mp3File.c_str());
   activateRFID();
+  deactivateSD();
   blockState = false;
 }
 
@@ -199,7 +201,7 @@ void readRFID() {
 }
 
 void clearInt(MFRC522 mfrc522) {
-  mfrc522.PCD_WriteRegister(mfrc522.ComIrqReg, 0x7F);
+  mfrc522.PCD_WriteRegister(mfrc522.ComIrqReg, 0x60);
 }
 
 void IRAM_ATTR rfid_interrupt() {
@@ -260,13 +262,15 @@ void setup()
       * Allow the ... irq to be propagated to the IRQ pin
       * For test purposes propagate the IdleIrq and loAlert
       */
-      //rfid.PCD_WriteRegister(rfid.ComIEnReg, 0xA0);
-      attachInterrupt(IRQ_RFID, rfid_interrupt, FALLING);
-
-      do { //clear a spourious interrupt at start
+      rfid.PCD_WriteRegister(rfid.ComIEnReg, 0x60);
+      attachInterrupt(IRQ_RFID, rfid_interrupt, RISING);
+      //clear a spourious interrupt at start
+      /*
+      do { 
         ;
       } while (!newRfidInt);
       newRfidInt = false; //interrupt flag
+      */
   } else {
     Serial.println("RFID Self Test failed!");
   }
@@ -274,6 +278,7 @@ void setup()
   audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
   audio.setVolume(volume); // 0...21
 
+
   Serial.println("Audio initialized.");
 
 
@@ -311,22 +316,26 @@ void setup()
 
 void loop()
 {
-
   deactivateRFID();
+  activateSD();
   audio.loop();
+  deactivateSD();
   activateRFID();
+  /*
+  if(rfid.PICC_IsNewCardPresent()) {    
+        stop();    
+        readRFID();
+  }*/
 
   if (newRfidInt) {
+      
       Serial.println("Interrupt.");
-      if(rfid.PICC_IsNewCardPresent()) {        
+      if(rfid.PICC_IsNewCardPresent()) {    
+        stop();    
         readRFID();
-        stop();
       }
-  
-      
-      clearInt(rfid);
+      //clearInt(rfid);
       newRfidInt = false;
-      
   }