You may be interested in a project published to the Hackster.io website earlier this year providing instructions on how to create a simple wearable heart rate monitor using an Arduino Nano R3.

The proposed wearable sensor could reliably measure the concentration of chloride ions in sweat. The sensor can also transmit data wirelessly, making it useful for real-time health monitoring.

"Our work on wearable heart sound devices marks a significant step forward in the early detection and monitoring of cardiovascular diseases," says Dr. Bee Luan Khoo, Associate Professor at the ...