An Open Heart Rate Monitor

A developer named Milos Rasic built an open-source Bluetooth heart rate monitor using an AD8232 sensor for heart rate capture and a Seeed Studio XIAO ESP32 board for Bluetooth connectivity. Power comes from a single 3.7V cell boosted to 5V, with no charge controller included to keep the design simple. Software is loaded via the Arduino IDE, meaning other ESP32-based boards could potentially be adapted to run it with minor modifications. The project is a DIY alternative to commercial gym-style chest strap heart rate monitors, and the same creator previously gave a talk on open medical devices and blood pressure monitoring accuracy at Hackaday Europe.

Source: https://hackaday.com/2026/09/14/an-open-heart-rate-monitor. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.