How to calculate the respiration rate from a Polar H10 chest strap in Python?

For practicing breath meditation, it is helpful to know you breath rate. Peter Charlton, British Heart Foundation Research Fellow in the Department of Public Health and Primary Care, at the University of Cambridge: https://peterhcharlton.github.io/ says, a normal breath rate is between 12 – 20 breath per minute. Peter Charlton has developed a “A Toolbox of …