Added description and instructions on how to set up to README.md

README.md

@@ -1,3 +1,37 @@
-# simple-bt-receiver
+# Simple Bluetooth Receiver
 
-Simple bluetooth receiver built on ESP32 using the AudioTools library
+Simple bluetooth receiver built on ESP32 using the AudioTools library. It gets an a2dp stream via bluetooth and then transmits it to a I2S device (e.g. PCM5102A).
+
+
+## Hardware
+
+Just a 
+
+- ESP32 (eg. dev module) and
+- a external DAC (eg. PCM5102A breakout boards)
+
+are needed for this to work.
+
+---
+
+**Connecting together:**
+
+I2S device | ESP32   | Usage
+---------- | ------- | -----------
+VIN/VCC    | 3V3/5V  | Power (3V)
+GND        | GND     | Power (GND)
+WS/LRCLK   | GPIO15  | Word select
+DIN/Data   | GPIO22  | actual i2s data
+BCLK       | GPIO15  | Serial clock
+
+
+## Flashing
+
+Just clone the repo, open the project in arduino IDE, connect ESP32, select correct Board Type.
+Due to the large size of the libraries used, the partition scheme needs to be changed: Go to _Tools_ -> _Partition Scheme_ and select _**Minimal SPIFFS**_.
+Now compile and flash using the upload button (or _CTRL+U_)!
+
+
+## License
+
+This project is licensed under GPL-3.0-or-later. See [LICENSE](LICENSE).