From b73a609fad2a8e97ed9e708d9d91258b9ac1831c Mon Sep 17 00:00:00 2001
From: Elwin Hammer <elwinhamer@gmail.com>
Date: Sat, 18 May 2024 23:13:57 +0200
Subject: ESP code converted to Arduino

---
 .../arduino-vaultpuzzle/arduino-vaultpuzzle.ino    | 130 +++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 main/puzzle/vault/arduino-vaultpuzzle/arduino-vaultpuzzle.ino

diff --git a/main/puzzle/vault/arduino-vaultpuzzle/arduino-vaultpuzzle.ino b/main/puzzle/vault/arduino-vaultpuzzle/arduino-vaultpuzzle.ino
new file mode 100644
index 0000000..18509d3
--- /dev/null
+++ b/main/puzzle/vault/arduino-vaultpuzzle/arduino-vaultpuzzle.ino
@@ -0,0 +1,130 @@
+#include <Wire.h>
+
+// Definitions for GPIO numbers, change these according to your hardware setup
+#define TOTAL_LEVELS 5
+#define TAG "VaultPuzzle"
+
+// Key Matrix Pin Configuration
+#define ROWS 4
+#define COLS 3
+const int ROW_PINS[ROWS] = {32, 33, 25, 26}; // Update these pin numbers based on your Arduino setup
+const int COL_PINS[COLS] = {27, 14, 12}; // Update these pin numbers based on your Arduino setup
+
+typedef enum {
+    STATE_UNINITIALIZED,
+    STATE_RESET,
+    STATE_PLAYING,
+    STATE_SOLVED,
+    STATE_ERROR
+} PuzzleState;
+
+const char* validButtons[TOTAL_LEVELS] = {"A3", "F1", "U4", "C2", "L1"};
+PuzzleState puzzleState = STATE_UNINITIALIZED;
+int currentLevel = 0;
+
+// Function prototypes
+void send_i2c_update(PuzzleState state);
+void display_code(int level);
+void initialize_system();
+void check_button_press();
+void update_state_after_button_press(bool validPress);
+
+void setup() {
+  Serial.begin(9600);
+  Wire.begin(); // Initialize I2C as master
+  initialize_system();
+  Serial.println("GPIO and I2C initialized.");
+}
+
+void loop() {
+  while (puzzleState != STATE_SOLVED) {
+      check_button_press();
+      delay(100); // Non-blocking delay
+  }
+}
+
+void send_i2c_update(PuzzleState state) {
+    uint8_t data;
+    switch (state) {
+        case STATE_UNINITIALIZED: data = 0x00; break;
+        case STATE_RESET: data = 0x01; break;
+        case STATE_PLAYING: data = 0x02; break;
+        case STATE_SOLVED: data = 0x03; break;
+        case STATE_ERROR: data = 0x04; break;
+        default: data = 0xFF; // Unknown state
+    }
+    Serial.print("Sending state "); Serial.println(state);
+    
+    Wire.beginTransmission(I2C_SLAVE_ADDR);
+    Wire.write(data);
+    byte error = Wire.endTransmission();
+    
+    if (error == 0) {
+        Serial.print("State update sent successfully.");
+    } else {
+        Serial.print("Failed to send state update via I2C.");
+    }
+}
+
+void display_code(int level) {
+    Serial.print("Displaying code for level "); Serial.println(level);
+    
+    Wire.beginTransmission(I2C_SLAVE_ADDR);
+    Wire.write(level);
+    byte error = Wire.endTransmission();
+    
+    if (error == 0) {
+        Serial.print("Code for level "); Serial.print(level); Serial.println(" displayed successfully.");
+    } else {
+        Serial.print("Failed to display code for level "); Serial.print(level); Serial.println(" via I2C.");
+    }
+}
+
+void initialize_system() {
+    // Configure the rows as input with pull-up
+    for (int i = 0; i < ROWS; i++) {
+      pinMode(ROW_PINS[i], INPUT_PULLUP);
+    }
+    
+    // Configure the columns as output
+    for (int i = 0; i < COLS; i++) {
+      pinMode(COL_PINS[i], OUTPUT);
+      digitalWrite(COL_PINS[i], HIGH);
+    }
+}
+
+void check_button_press() {
+    char keyPress[3] = {0};
+    for (int col = 0; col < COLS; col++) {
+        digitalWrite(COL_PINS[col], LOW); // Activate column
+        for (int row = 0; row < ROWS; row++) {
+            if (digitalRead(ROW_PINS[row]) == LOW) { // Detect if any row is activated
+                keyPress[0] = 'A' + row;
+                keyPress[1] = '1' + col;
+                keyPress[2] = '\0';
+                Serial.print("Keypress detected: "); Serial.println(keyPress);
+                update_state_after_button_press(strcmp(keyPress, validButtons[currentLevel]) == 0);
+                while (digitalRead(ROW_PINS[row]) == LOW) {} // Wait for release
+            }
+        }
+        digitalWrite(COL_PINS[col], HIGH); // Deactivate column
+    }
+}
+
+void update_state_after_button_press(bool validPress) {
+    if (validPress) {
+        if (currentLevel >= TOTAL_LEVELS) {
+            puzzleState = STATE_SOLVED;
+            Serial.println("Puzzle solved!");
+            send_i2c_update(puzzleState);
+        } else {
+            puzzleState = STATE_PLAYING;
+            currentLevel++;
+            display_code(currentLevel);
+        }
+    } else {
+        puzzleState = STATE_ERROR;
+        Serial.println("Error in input");
+    }
+    send_i2c_update(puzzleState);
+}
-- 
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