Project Hub /Security Surveillance & Defense/RFID / NFC Access Systems/Skull of Fate SAO

Advanced

RASPBERRY PI

Project Specific

3 – 6 Hours

Partial Kit

Skull of Fate SAO

The Skull of Fate SAO is an interactive tarot RFID card and badge add-on featuring custom LED eye animations, accelerometer and sound reactivity, and I2C communication capabilities.

Originally published on Hackaday.io

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

MPU6050 - Triple Axis Accelerometer + Gyroscope Module Rs. 438.00
RFID Reader/Writer RC522 SPI S50 with RFID Card and Tag Rs. 190.00
Microphone module - Analog Sound Sensor Module for Arduino Rs. 63.00
Reed Switch 2×14mm Normally Open Magnetic Sensor Out of stock
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: EEPROM / Memory IC
LED Strip / NeoPixel / WS2812
Header Pins / Terminals / Connectors
ATSAMD21G18A-MU Microcontroller

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How It Works

The Skull of Fate SAO is an advanced wearable add-on built around the ATSAMD21G18A-MU microcontroller, designed to interface with host platforms like the Raspberry Pi or Raspberry Pi Pico W via a BH254VS-6P SAO connector. At the heart of its interactive features is the ST25DV64KC NFC/RFID chip, which allows the module to read and store data wirelessly through near-field communication, perfect for interactive tarot applications or badge-to-badge communication. Visual feedback is driven by XL-1010RGBC-WS2812B addressable RGB LEDs that create custom eye animations controlled through data signals. To make the device reactive to its physical environment, it integrates an LIS3DHTR accelerometer for motion and tilt detection, a magnetic Hall effect sensor for proximity or magnetic triggers, and a PDM microphone that captures ambient audio for sound-reactive patterns. Additionally, W25Q128JVSIQ flash memory is included to store complex animation sequences, user configurations, and runtime data. The entire system can be developed and programmed using either the Arduino IDE or MicroPython, offering flexibility in how firmware interacts with these onboard sensors and peripherals over I2C and digital input/output lines.

Why Build This

Design and program complex interactive wearable technology featuring addressable LED animations tied to environmental inputs.

Implement wireless communication and data logging using NFC/RFID and external flash memory.

Integrate multiple sensor modalities—including accelerometers, Hall effect sensors, and microphones—into a unified embedded system.

Real-World Application

Interactive conference badge add-ons, electronic accessories, wearable tech, and interactive art installations.

Skills You'll Learn

I2C communication

addressable LED data protocols

MEMS sensor integration

NFC/RFID data handling

flash memory management

digital microphone interfacing

embedded firmware development using Arduino IDE and MicroPython

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

SAMD21

MICROPYTHON

ARDUINO

I2C

NFC

RFID

NEOPIXELS

ACCELEROMETER

PDM MICROPHONE

SAO

BADGE

PCB DESIGN

Frequently Asked Questions

What host boards can the Skull of Fate SAO connect to?

It is designed to mount via a standard BH254VS-6P SAO connector to compatible host boards such as the Raspberry Pi or Raspberry Pi Pico W.

Can I program this project using Python?

Yes, the project supports MicroPython alongside the Arduino IDE, giving you flexibility in your choice of programming environment.

What is the purpose of the ST25DV64KC chip?

The ST25DV64KC is an NFC/RFID chip that enables wireless data transmission and reading, allowing the badge to interact with smartphones and other NFC-enabled tags.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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