diff --git a/Firmware/README.md b/Firmware/README.md
index e515b87..e22bf71 100644
--- a/Firmware/README.md
+++ b/Firmware/README.md
@@ -3,4 +3,22 @@
 Example Sensor Node Firmware with a BMP/E280 Sensor. 
 Please Change the Values in src/secconfig.h to your Keys from https://console.thethingsnetwork.org. Device has to be set to ABP Mode.
 
-Project was created using PlatformIO Atmel-AVR Framework
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+Project was created using PlatformIO Atmel-AVR Framework
+
+## Decoder for the TTN Application
+
+```
+function Decoder(bytes, port) {
+  var decoded = {};
+  decoded.t = (bytes[0]) | (bytes[1] << 8 ) | (bytes[2] << 16 ) | (bytes[3] << 24)
+  decoded.t = decoded.t / 100
+  decoded.p = (bytes[4]) | (bytes[5] << 8 ) | (bytes[6] << 16 ) | (bytes[7] << 24)
+  decoded.p = decoded.p / 100
+  decoded.h = (bytes[8]) | (bytes[9] << 8 ) | (bytes[10] << 16 ) | (bytes[11] << 24)
+  decoded.h = decoded.h / 100
+  decoded.v = (bytes[12]) | (bytes[13] << 8 ) | (bytes[14] << 16 ) | (bytes[15] << 24)
+  decoded.v = decoded.v / 1000
+
+  return decoded;
+}
+```
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