2 ms·
See https://news.ycombinator.com/item?id=22652047 https://news.ycombinator.com/item?id=22652047 for some discussion on using heart rate
by matharmin 7y ago
See https://news.ycombinator.com/item?id=22652047 https://news.ycombinator.com/item?id=22652047 for some discussion on using heart rate