As explained here: What you need for this: An ECG recorder as for instance the iWorx, model RA834: Alternatively we can take OpenBCI Cyton: https://docs.openbci.com/GettingStarted/Biosensing-Setups/ECGSetup/ Respiratory Rate Estimation Version 3.0.0.0 (682 KB) by Peter H Charlton https://www.mathworks.com/matlabcentral/fileexchange/55289-respiratory-rate-estimation Matlab The compiled version of Matlab Octave