Add code for archiv drawers

drawers/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

drawers/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:megaatmega2560]
+platform = atmelavr
+board = megaatmega2560
+framework = arduino

drawers/src/main.cpp

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+#include <Arduino.h>
+
+   ARCHIV – Arduino Mega (I2C-Slave)
+   Alle ehemaligen Puls-Signale jetzt rein logisch über I2C
+   ========================================================= */
+
+#include <Wire.h>
+
+// I2C
+const uint8_t I2C_ADDR = 0x10;
+
+// I2C-Befehle (müssen zum Master-Code passen)
+const uint8_t CMD_LED_LOCK_TOGGLE   = 0x01;
+const uint8_t CMD_ALLES_GESCHAFFT   = 0x02;
+const uint8_t CMD_AUSWAHLRAD_LINKS  = 0x03;
+const uint8_t CMD_AUSWAHLRAD_RECHTS = 0x04;
+
+/* -------------------------
+   Hardware
+   ------------------------- */
+
+struct Schublade {
+  int schlossPin;
+  int ledPin;
+};
+
+Schublade schubladen[8] = {
+  {6, 30},
+  {9, 32},
+  {7, 31},
+  {8, 33},
+  {2, 29},
+  {12, 28},
+  {11, 27},
+  {10, 26}
+};
+
+/* -------------------------
+   Zustände
+   ------------------------- */
+
+int  currentIndex = 0;
+bool ledsLocked   = false;
+bool schlossOffen = false;
+
+/* -------------------------
+   Schloss-Timer
+   ------------------------- */
+
+const unsigned long SCHLOSS_DAUER = 750;
+unsigned long schlossStart = 0;
+
+/* ========================================================= */
+
+void setup() {
+  Wire.begin(I2C_ADDR);
+  Wire.onReceive(onI2CReceive);
+
+  for (int i = 0; i < 8; i++) {
+    pinMode(schubladen[i].ledPin, OUTPUT);
+    pinMode(schubladen[i].schlossPin, OUTPUT);
+    digitalWrite(schubladen[i].ledPin, LOW);
+    digitalWrite(schubladen[i].schlossPin, LOW);
+  }
+
+  updateLEDs();
+}
+
+/* ========================================================= */
+
+void loop() {
+  handleSchlossTimeout();
+}
+
+/* =========================================================
+   I2C-Callback
+   ========================================================= */
+
+void onI2CReceive(int len) {
+  while (Wire.available()) {
+    uint8_t cmd = Wire.read();
+
+    switch (cmd) {
+
+      case CMD_LED_LOCK_TOGGLE:
+        ledsLocked = !ledsLocked;
+        updateLEDs();
+        break;
+
+      case CMD_ALLES_GESCHAFFT:
+        openSchlossTimed();
+        break;
+
+      case CMD_AUSWAHLRAD_RECHTS:
+        if (!ledsLocked) {
+          currentIndex = (currentIndex + 1) % 8;
+          updateLEDs();
+        }
+        break;
+
+      case CMD_AUSWAHLRAD_LINKS:
+        if (!ledsLocked) {
+          currentIndex = (currentIndex + 7) % 8;
+          updateLEDs();
+        }
+        break;
+    }
+  }
+}
+
+/* =========================================================
+   LED-Steuerung
+   ========================================================= */
+
+void updateLEDs() {
+  for (int i = 0; i < 8; i++)
+    digitalWrite(schubladen[i].ledPin, LOW);
+
+  if (!ledsLocked)
+    digitalWrite(schubladen[currentIndex].ledPin, HIGH);
+}
+
+/* =========================================================
+   SCHLOSS – zeitgesteuert
+   ========================================================= */
+
+void openSchlossTimed() {
+  for (int i = 0; i < 8; i++)
+    digitalWrite(schubladen[i].schlossPin, LOW);
+
+  digitalWrite(schubladen[currentIndex].schlossPin, HIGH);
+  schlossOffen = true;
+  schlossStart = millis();
+}
+
+void handleSchlossTimeout() {
+  if (schlossOffen && millis() - schlossStart >= SCHLOSS_DAUER) {
+    for (int i = 0; i < 8; i++)
+      digitalWrite(schubladen[i].schlossPin, LOW);
+
+    schlossOffen = false;
+  }
+}