Breathing Back Pressure Data Analysis

I've uploaded some datasets of the blower in different modes, and the measured current and whether I am exhaling (0) or inhaling (1). The breath signal is generated by me pressing a button. Visualizing the current data suggest that is look very easy to detect the breath back-pressure in CPAP mode (top plot). The middle plot shows the regular shape of the current curve in each breath. The bottom plot show the irregular shape that occurs when the breath is out of sync with blower cycle. This suggests it would be possible to detect the patients breath cycle, or adapt to minimize out of phase behavior. It would be great to get help with this.

This uses the visualization code here.

Current sensing uses this version of the schematic. It uses a 0.1 ohm 1 watt current sensing resistor. As the current draw by the BLDC motor goes up, the voltage across the sense resistor increases. This voltage passes through a small RC filter to smooth out noise before being read by an analog input on the Arduino. The reference voltage is a 1.1V internal reference which gives ~1mV of resolution using the 10bit ADC, which corresponds to ~10mA current resolution.