diff --git a/README.md b/README.md
index fdc0a1e..8d593d8 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,20 @@
 
 ## Microcontroller
 
-D1 Mini ESP32
-Due to mp3 playback it needs a multicore esp 32:
+We are using an ESP-WROOM-32 module. For the mp3 decoding we need a multicore CPU, be careful, there are some ESP32 with only one core.
 
-This library only works on multi-core ESP32 chips like the ESP32-S3. It does not work on the ESP32-S2 or the ESP32-C3 warning
+![](images/ESP32-wroom-32-pinout.png)
 
 ## Pins
 
+The plain number refers to the GPIO pin.
+
 ### Amplifier
+
+MAX98357A I2S 3W DAC Class D Amplifier Module
+
+![](images/amp.png)
+
 ```
 26 -> DIN
 27 -> BCLK
@@ -18,7 +24,9 @@ This library only works on multi-core ESP32 chips like the ESP32-S3. It does not
 GND -> GND
 ```
 
-### SD Card
+### SD Card Reader
+
+SD Card Reader Adapter Modul
 
 ```
 CS -> 22 (D1)
@@ -29,6 +37,8 @@ MISO -> 19 (D6)
 
 ### RFID Reader
 
+NFC RFID module RC522
+
 ```
 SOA -> 32
 SCK -> 18
@@ -48,7 +58,7 @@ Interrupt method was not working because it seems reading a card does not trigge
 See https://arduino.stackexchange.com/a/76285 and https://github.com/miguelbalboa/rfid/blob/master/examples/MinimalInterrupt/MinimalInterrupt.ino
 
 
-## Buttons
+### Buttons
 
 ```
 Start / Stop -> 17 and GND
@@ -56,6 +66,18 @@ Wake up / Next -> 04 and GND
 Previous -> 16 and GND
 ```
 
+
+## Battery Voltage
+
+The battery voltage is measured by the ADC of pin 35. A voltage divider halves the voltage so that the pin can not be overloaded (max 3.3V).
+The voltage divider consists of two 100kOHM resistors, the voltage is measured between them. One side is connected to the battery and the other to ground.
+There are 2 ADCs, make sure to not use the one which is not usable during WIFI!
+
+## Power
+
+We use the voltage regulator of the SD Card module. We also can use a LDL1117S33R Low Dropout Voltage regulator. For Loading the LiIon we can use a LTC4054 or a dedicated module.
+
+
 ## System sounds
 
 Place these sounds in the folder `system` on the SD card:
@@ -65,20 +87,8 @@ Place these sounds in the folder `system` on the SD card:
 
 sleep.mp3 will be played just before the timed shutdown, start.mp3 will be played if the box started and initialized successfully.
 
-
-## Battery Voltage
-
-The battery voltage is measured by the ADC of pin 13. A voltage divider halves the voltage so that the pin can not be overloaded (max 3.3V).
-The voltage divider consists of two 100kOHM resistors, the voltage is measured between them. One side is connected to the battery and the other to ground.
-Pin 13s ADC (ADC2) can not be used while WIFI is on... damn.
-
 ## TODOs
 
-* Card Reader with SPI. Configure hspi, second SPI channel? Or does SD Card + RFID run at the same channel?
-
-![](images/wemos-d1-mini-esp32.png)
-
-
 ## Schematic without modules
 
 ### Charging circuit
@@ -86,8 +96,6 @@ Pin 13s ADC (ADC2) can not be used while WIFI is on... damn.
 https://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf
 MCP73837 ?
 
-
-
 ## Links
 
 https://github.com/earlephilhower/ESP8266Audio
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diff --git a/images/amp.png b/images/amp.png
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diff --git a/src/main.cpp b/src/main.cpp
index 0b1bb5f..0b861ec 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -422,6 +422,7 @@ void setup()
   rootNode.printDirectoryTree();
 
   readDataFromFile(mapping_file.c_str());
+  
   String progressPath = "/"+sys_dir+"/"+progress_file;
 
   continuePlaying = readSongProgress(progressPath.c_str());