diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+# KrautStatus
+
+This repository contains documentation and sources of KrautStatus. KrautStatus
+is the n-th iteration of a software/hardware project to communicate whether
+Jena's Krautspace is open or closed.
+
+KrautStatus consists of three components: an Arduino-sensor-combination at the
+door, a Python script on a local server, and an API file served on by web
+server.
+
+The Arduino broadcasts the current state of the door lock to our LAN. The state
+is determined by a reed sensor in the door lock. In addition, it controls an
+RGB LED matrix shield that provides a visual indication of the door locks's
+state in the room.
+
+The python script polls the broadcast state and pushes changes to Twitter,
+Mastodon and our API file.
+
+The API file is just that, a JSON file. It contains, among other things, the
+current state of the door lock.
+
+## Arduino
+
+## Python Script
+
+## API
diff --git a/source/arduino/config.h b/source/arduino/config.h
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+++ b/source/arduino/config.h
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+// SSID and password of the WiFi network to which we broadcast the door lock's
+// status.
+char SSID[] = "";
+char PASSWORD[] = "";
+
+
+// Port on which to listen for status requests
+unsigned int PORT = 12345;
+
+// Pin to which the reed switch is connected
+uint8_t REED_PIN = 0;
diff --git a/source/arduino/door_status.ino b/source/arduino/door_status.ino
new file mode 100644
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+++ b/source/arduino/door_status.ino
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+#include <SPI.h>
+#include <WiFi101.h>
+#include <WiFiUdp.h>
+
+#include "config.h"
+
+uint8_t OPEN = 1;
+uint8_t CLOSED = 0;
+
+int wifi_status = WL_IDLE_STATUS;
+
+WiFiUDP Udp;
+
+void setup() {
+  pinMode(REED_PIN, INPUT_PULLUP);
+
+  Serial.begin(9600);
+  while (!Serial);
+
+  if (WiFi.status() == WL_NO_SHIELD) {
+    Serial.println("No WiFI shield present");
+    // TODO: Create noShieldLoop with visual indication.
+    while (true);
+  }
+
+  while (true) {
+    // TODO: Visually indicate that we are trying to connect
+    Serial.print("Connecting to SSID: ");
+    Serial.println(SSID);
+    status = WiFi.begin(SSID, PASSWORD);
+
+    if (status == WL_CONNECTED) {
+      break;
+    }
+
+    // TODO: Visually indicate that we waiting for trying to connect again
+    delay(10000);
+  }
+
+  printNetworkInfo();
+
+}
+
+void loop() {
+  int reed_state = digitalRead(REED_PIN);
+
+  int packetSize = Udp.readPacket();
+  if (packetSize) {
+    Udp.beginPacket(udp.remoteIP(), Udp.remotePort());
+
+    if (reed_state == HIGH) {
+      Udp.write(CLOSED);
+    } else {
+      Udp.write(OPEN);
+    }
+
+    Udp.endPacket();
+  }
+  // TODO: Visually indicate open/closed state.
+}
+
+
+void printNetworkInfo() {
+
+  Serial.print("Connect to WiFi");
+
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  byte mac[6];
+  WiFi.macAddress(mac);
+  Serial.print("MAC address: ");
+  for (int i = 5; i >= 0; --i) {
+    if (mac[i] < 16) {
+      Serial.print("0");
+    }
+
+    Serial.print(mac[i], HEX);
+
+    if (i > 0) {
+      Serial.print(":");
+    }
+  }
+  Serial.println();
+
+}
diff --git a/api b/source/server/api
similarity index 100%
rename from api
rename to source/server/api
diff --git a/api_template b/source/server/api_template
similarity index 100%
rename from api_template
rename to source/server/api_template
diff --git a/apistatusd.conf b/source/server/apistatusd.conf
similarity index 100%
rename from apistatusd.conf
rename to source/server/apistatusd.conf
diff --git a/apistatusd.py b/source/server/apistatusd.py
similarity index 100%
rename from apistatusd.py
rename to source/server/apistatusd.py
diff --git a/setstatus.conf b/source/server/setstatus.conf
similarity index 100%
rename from setstatus.conf
rename to source/server/setstatus.conf
diff --git a/setstatus.py b/source/server/setstatus.py
similarity index 100%
rename from setstatus.py
rename to source/server/setstatus.py
diff --git a/statusd.service b/source/server/statusd.service
similarity index 100%
rename from statusd.service
rename to source/server/statusd.service
diff --git a/watchdoor.py b/source/server/watchdoor.py
similarity index 100%
rename from watchdoor.py
rename to source/server/watchdoor.py
diff --git a/watchdoor.service b/source/server/watchdoor.service
similarity index 100%
rename from watchdoor.service
rename to source/server/watchdoor.service