Integration
Making sensors and sound generation work smoothly needed careful calibration and a lot of debugging.
Tangible InteractionSemester 1 · 2025
VEDNA
A musical instrument played by touching nature, where music moves from calm to energetic as textures go from soft to hard.
Build an electronic instrument on an Arduino Uno where natural materials act as keys, each mapped to a music mood, with reliable touch detection and minimal delay.
Hover or tap: soft to hard, calm to energetic. Tones are a simple recreation of the mapping.
Hypothesis
If soft textures trigger gentle sounds and rough textures trigger energetic ones, people will feel an emotional shift as their hand moves across the board, and touching real materials will feel more memorable than pressing plastic buttons.
Build
Hidden sensorsA capacitive touch sensor sits under each material, so it feels like nature itself is making the sound.
Arduino UnoFive inputs (D2–D6), one per material, with clean pin mapping and a common ground.
Sound outPWM output through an LM386 amplifier to a speaker.
Uneven sensitivity
Sensors behind different materials detected touch inconsistently and needed tuning.
SD card failed
The planned SD-card audio module had unstable SPI communication, so stored music samples were dropped.
01 · Idea
A nature sound path
The board arranges cotton, leaves, soil, bark and stones from softest to hardest. Each hides a touch sensor, and each maps to a music mood from soft to rock, so the hand travels a gradient of emotion.
02 · Build
Making it work
We listed materials with clearly different textures, drew a block diagram (surfaces, sensors, Arduino Uno, speaker), hid the sensors so nature seems to make the sound, and chose capacitive sensors that work through thin coverings.
03 · Opportunity
Where it could go
Low-cost and expressive, the idea could become a museum exhibit, a therapy tool, a children’s learning toy or a public installation where touching natural materials creates soundscapes.
What I learned
Takeaways
- 01Electronics are a design material, and their limits shape the experience.
- 02Sensor calibration takes most of the time; plan for it.
- 03Have a fallback when a component (the SD card) fails.
- 04Touching real materials makes an interaction memorable in a way buttons don’t.