ChromaMind

ChromaMind is a revolutionary device that bridges personal wellness with digital ownership. It uses tailored sessions of light and sound to guide you into states of heightened focus, deep meditation, or vibrant energy. Each unique experience is then transformed into a beautiful and provably rare digital collectible, creating a personal gallery of your own sensory journeys that you can own and share.

ChromaMind is a full-stack project, spanning custom hardware, embedded software, a mobile front-end, and decentralized on-chain logic. We built every component from the ground up during this hackathon.

1. The Hardware: A Custom Bio-Interface The physical device isn't off-the-shelf; it's a product of rapid prototyping. We designed and 3D printed the entire enclosure during the hackathon to create a comfortable, ergonomic fit that ensures optimal light diffusion for the user. At its heart is an ESP32 microcontroller, chosen for its dual-core processing power and built-in Wi-Fi, which was critical for our prototype's communication. This controls a matrix of addressable RGBW LEDs, allowing for precise and vibrant color patterns that form the core of the ChromaMind experience.
2. The Brain: Real-time Generative Experiences with FFT To create truly dynamic and immersive sessions, especially for the "Rave" mode, we went beyond pre-programmed patterns. We implemented a Fast Fourier Transform (FFT) algorithm directly on the ESP32. This allows the device to listen to any external audio source in real-time. The FFT algorithm analyzes the audio, separates it into frequency bands (bass, mids, highs), and maps the intensity of each band to different colors and light patterns. The result is a stunning, real-time audio visualizer that syncs perfectly with any song the user plays, creating a unique experience every single time.
3. The Application Layer: World Mini App To create a seamless and accessible user experience, we built our control interface as a Mini App within the World App. This was a strategic choice that allowed us to tap into an existing ecosystem of millions with integrated wallets, completely removing the friction of user onboarding. The Mini App serves as the command center where users can customize their sessions—choosing modes, setting durations, and initiating their journey.
4. The On-Chain Logic: Zircuit & Chainlink Zircuit (The Ledger): All of our on-chain logic and the "Trip NFTs" themselves live exclusively on the Zircuit network. We chose Zircuit for its high performance and security-focused architecture, which is essential when creating valuable and collectible digital assets. Our Solidity smart contract handles the minting logic and ownership of every unique trip. Chainlink (The Scarcity Engine): To make the experience compelling and collectible, we integrated Chainlink VRF (Verifiable Random Function). When a user mints a "Trip NFT," our Zircuit smart contract calls Chainlink to receive a provably random number. This number is used to assign rare traits to the NFT, creating a fun and engaging "gacha" mechanic. This elevates our NFTs from simple souvenirs to a provably scarce and exciting collectible game.
5. The "Hacky" But Brilliant Part: Device Communication Implementing a full, robust Bluetooth Low Energy (BLE) service stack is incredibly time-consuming. To ensure a rock-solid and reliable connection for our demo, we implemented a lightweight local web server on the ESP32. The World Mini App communicates with the device by sending simple, direct HTTP requests over the local network. This clever shortcut allowed us to bypass the complexities of BLE pairing and focus on building out the core features, delivering a fast, responsive, and functional prototype under extreme time pressure.