Hannah Stein Capstone

For my capstone, I built a wrist-worn heart rate monitor for my nonprofit rowing team, PCR. Rowing is an expensive sport, and my team works to make it accessible to kids who could not otherwise afford it. I wanted to contribute something that reflected that mentality.

The process started with a completely different idea. I originally planned to build a SpeedCoach, a device that tracks splits on the water, but after researching the cost and complexity, I had to pivot. I polled my teammates, landed on heart rate monitors, and went deep into research on how they work. Along the way, my anatomy teacher showed me data proving that heart rate monitors are less accurate for people with darker skin tones, which became a major focus of my research.

When talking to my teammates, they said reading a small number on a display while rowing was too difficult mid-stroke. So I designed the monitor around a circular ring of lights showing what percentage of your maximum heart rate you are at, with colors for each zone: blue for zone 1, green for zone 2, yellow for zone 3, orange for zone 4, and red for zone 5. At a glance, you know exactly where you are without breaking focus.

The biggest thing I learned is that building is a people process. Coaches, teammates, classmates, and even family solved problems I could not get alone. I also learned to trust making something over researching it before you start.