Implement and document Arduino software

source/arduino/arduino.ino

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+/*
+Copyright (c):
+
+Philipp Matthias Schäfer (philipp.matthias.schaefer@posteo.de), 2020
+
+This file is part of the KrautStatus' Arduino code.
+
+The Clean CommonMark library is free software: you can redistribute it and/or
+modify it under the terms of the GNU Affero General Public License as published
+by the Free Software Foundation, either version 3 of the License, or (at your
+option) any later version.
+
+The Clean CommonMark library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
+for more details.
+
+You should have received a copy of the GNU Affero General Public License along
+with the Clean CommonMark library. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <SPI.h>
+#include <uTimerLib.h>
+
+#include "config.h"
+#include "matrix.h"
+#include "sensor.h"
+#include "serial.h"
+#include "wifi.h"
+
+const unsigned long int MATRIX_UPDATE_FREQUENCY = 1;
+
+void setup() {
+  serial_setup();
+  matrix_setup();
+
+  boolean wifi_result = matrix_show_scan_and_run(wifi_setup);
+  if (!wifi_result) {
+    matrix_show_failure();
+    while(true);
+  }
+
+  sensor_setup();
+
+  start_matrix_update();
+}
+
+void loop() {
+  int packetSize = Udp.parsePacket();
+  if (packetSize) {
+    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
+    Udp.write(uint8_t(sensor_get_door_state()));
+    Udp.endPacket();
+  }
+}
+
+void start_matrix_update() {
+  TimerLib.setInterval_us(matrix_update, 1000000 / MATRIX_UPDATE_FREQUENCY);
+}
+
+void matrix_update() {
+  switch (sensor_get_door_state()) {
+  OPEN:
+    matrix_fill(GREEN);
+    break;
+  CLOSED:
+    matrix_fill(BLACK);
+    break;
+  }
+}