How fast does your heart beat? It’s a tough question to answer, because our heart rate changes all the time depending on what we’re doing and how our body is behaving. However, ...

for more information on building your very own heartbeat visualiser using an Arduino Nano microcontroller and heart rate sensor jump over to the official Instructables project page.

As we previously detailed, Powerbeats Pro 2 will have a built-in heart-rate sensor. The earbuds will send the user’s heart rate to the Apple Health app.