Reading a swimmer's fatigue and hydration straight off their skin.

A wearable device designed to continuously monitor a swimmer's hydration and fatigue levels by analyzing their sweat in real time.

2ESP32-S3 sensing nodes

15swimmers field-tested

Dashboard

Heart Rate

128bpm

Sweat Salinity

4.8ppt

1–2%body-mass loss from sweat during a session

6–8%drop in anaerobic power & muscle endurance

12-bitADC resolution on the final ESP32-S3 build

Explore The Project

Follow the build from problem to prototype to pool-tested results.

Why invisible sweat loss is a real risk to swimmers' health and performance.

The dual-sensing system: a sweat electrode node and a pulse sensor node.

Four builds — from cast PDMS to a handmade paper strip that works in a pool.

Results and a demo video from real training sessions with 15 swimmers.

The engineer and national-level swimmer behind the project.