Better Pedometer - HELP NEEDED!

Ok, I've just converted this to C and pushed updated code.

Running it with the csv file I gave shows interesting stats though:

// a1bc34f9a9f5c54b9d68c3c26e973dba195e2105   HughB-walk-1834.csv  1446
// oxford filter                                                   1584
// peak detection                                                  1752
// state machine                                                   1751

So during walking, not much difference in the state machine, but it will hopefully manage to reject more non-walking steps as you say.