Simplify drawer archive

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>
+#include <Wire.h>
+
+const uint8_t I2C_ADDR = 0x10;
+
+const uint8_t CMD_POWER_OFF    = 0x01;
+const uint8_t CMD_LIGHT_INDEX  = 0x02;
+const uint8_t CMD_DRAWER_INDEX = 0x03;
+
+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}
+};
+
+void turnAllLedsOf() {
+  for (int i = 0; i < 8; i++) {
+    digitalWrite(schubladen[i].ledPin, LOW);
+  }
+}
+void turnOnSingleLed(uint8_t indexOn) {
+  if (indexOn < 0 || indexOn >= 8)
+    return;
+  turnAllLedsOf();
+  digitalWrite(schubladen[indexOn].ledPin, HIGH);
+}
+
+const int LOCK_THRESHOLD = 750;
+unsigned long lockTimer = 0;
+bool unlocked = false;
+
+void openLock(uint8_t indexOn) {
+  unlocked = true;
+  lockTimer = millis();
+  digitalWrite(schubladen[indexOn].schlossPin, HIGH);
+}
+
+void onI2CReceive(int len) {
+  while (Wire.available()) {
+    uint8_t cmd = Wire.read();
+
+    switch (cmd) {
+
+      case CMD_POWER_OFF:
+        turnAllLedsOf();
+        break;
+
+      case CMD_LIGHT_INDEX:
+        uint8_t index = Wire.read();
+        turnOnSingleLed(index);
+        break;
+
+      case CMD_DRAWER_INDEX:
+        uint8_t index = Wire.read();
+        openLock(index);
+        break;
+    }
+  }
+}
+
+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);
+  }
+}
+
+void loop() {
+  if (unlocked && millis() - lockTimer >= LOCK_THRESHOLD) {
+    for (int i = 0; i < 8; i++) {
+      digitalWrite(schubladen[i].schlossPin, LOW);
+    }
+    unlocked = false;
+  }
+}