[SOLVED]Need help interpreting the serial output of a sensor

Hope you don't mind too much as effectively I have given you some work to do :)

yeah, it's a shame! nooo, it's the first time I try to interpret raw output data from sensor, so your comment helps me better understand on what's going on.

din't know about E.sum, i found more informations from the waveform exemple code very interresting, like :

Note: When dealing the large amounts of elements in Waveforms you'll start to notice Espruino's relatively slow execution speed. We'd recommend using E.sum, E.variance, E.convolve and E.FFT to work on large arrays wherever possible, and Array.forEach and Array.map to iterate over their elements.

I correct my duties at home, and I come back with a better copy, lol!