Luminous Tide--a Wearable System for Self-expression

I'm designing a wearable system inspired by marine bioluminescence. An ear cuff connected with a tail that reads your heart rate in real time and translates it into living light patterns. In this project, I imagine a world where emotional expression is not limited to speech or text. Instead of telling someone how you feel, your body could reveal emotional rhythms through light, movement, and changing patterns more directly and intuitively.

This project sits at the intersection of emotional communication and biotech. In a world where we're constantly connected but emotionally distant, this wearable gives people a new visual language that might offer a more instinctive communication compared to spoken words.

This project is not just a pulse or health tracker. It's a new medium for human expression.. And because it's built on accessible hardware like Arduino and LEDs integrated into textile structures, it opens a real path toward wearable emotional tech and possible future way of communication. I want to show that the body itself can be a display, and that the future of communication might also be something you wear, not something you say. The luminous tide turns invisible internal states into visible, shared experiences, reimagining how we express and understand emotion in everyday life.

Electronics

1. Arduino Nano 33 IoT
2. Pulse sensor
3. Haptic driver: DRV2605L
4. Haptic motor
5. LilyPad
6. Neopixels
7. Jumper wires
8. Heat shrink tubes

Materials

1. UV resin
2. Pearls for decoration
3. Hot glue gun
4. Half yards of fabric
5. Sewing kit
6. Ear Cuff Model

The project began with the core idea of translating heartbeat data into the behaviors of ocean animals. Three heart rate states were mapped to three creatures: a jellyfish for calm (under 95 bpm), a dolphin for joyful (95–120 bpm), and an anglerfish for stressed or overwhelmed (above 120 bpm). Each state would trigger a distinct combination of LED color, light rhythm, and haptic vibration. The physical form was inspired by a merman, with the tail housing the Arduino and main LED strip. The material and electronics needed are all planned out firstly.

I was building on the Arduino prototype then. The three states were reorganized into separate functions, status1, status2, and status3, that makes the code easier to debug and expand. FastLED replaced basic analogWrite calls, enabling full RGB color control across 60 NeoPixels. The jellyfish breathing effect was built using a sine wave on a running phase variable, producing a smooth organic glow. Haptic timing was made non-blocking using timestamp comparisons so vibration triggers never interrupted the LED animation. One ongoing issue was occasional instability in the pulse sensor readings.

I finalized and debugged everything for the electronics in the Arduino Prototype and make sure that every single components are working properly.

Before applying to the final materials, physical prototypes were built for each component of the wearable to verify sizing and structure. For the tail structure, cardboard was used to test the inner skeleton and confirm how the piece would connect the ear cuff down to the bracelet band. This step was essential for catching fit issues early, before any fabric cutting or soldering began.

With the breadboard prototype finalized, the electronics were transferred onto fabric. A prototype piece of fabric was cut to the tail shape, and the wiring layout was drawn directly onto it to plan where each component would sit. The LilyPad was positioned within the structure, and connections were first tested using alligator clips before any permanent soldering. The fabric also served a visual purpose. Its texture softly diffused the LED light through the material, which improved the overall glow effect compared to bare LEDs a lot.

The ear cuff was constructed using UV resin and hot glue gun. It is in an organic and fin-like form inspired by the merman concept. The structure curves asymmetrically around the ear, resembling a small aquatic fin or gill. Once the form was solid, a small piece of fabric was added to the back of the cuff to contain and focus the LED light, which significantly improved how the glow appeared when worn. The pulse sensor was then integrated into the ear cuff by gluing it to the ear clip at the bottom.

The last stage was bringing all the separate elements together into a finished wearable piece. The tail structure was sewn and secured, forming a continuous visual line from the ear cuff down to the bracelet. The LilyPad was fixed into the sewn fabric layers and all electronic connections were tightened and hidden into the fabric. Finally, I checked all the three lighting modes and confirmed that jellyfish, dolphin, and anglerfish states were all triggering correctly from live heartbeat data.