Initial commit: Minecraft Orb project

ESP32-C3 firmware for interactive treasure hunt device with RFID,
OLED display, LED effects, buzzer, and touch input.
Includes 3D printable STL files for the enclosure.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

firmware/platformio.ini

@@ -0,0 +1,27 @@
+; PlatformIO Project Configuration File
+; Minecraft Orb - ESP32-C3 SuperMini
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32c3]
+platform = espressif32
+board = esp32-c3-devkitm-1
+framework = arduino
+
+; Serial monitor
+monitor_speed = 115200
+
+; Build flags
+build_flags =
+    -DARDUINO_USB_CDC_ON_BOOT=1
+    -DARDUINO_USB_MODE=1
+
+; Libraries
+lib_deps =
+    ; OLED Display (SSD1306 via I2C)
+    adafruit/Adafruit SSD1306@^2.5.7
+    adafruit/Adafruit GFX Library@^1.11.5
+    ; RFID Reader (RC522 via SPI)
+    miguelbalboa/MFRC522@^1.4.10
+
+; Upload settings for ESP32-C3 SuperMini
+upload_speed = 921600