Multi-sensor breath analyte detection device

A method for measuring concentration of breath analytes, the method comprising:

• receiving, in a breath volume within a pocketable hand-held device, gas exhaled by a user in a single breath;
• receiving, from a sampling sensor, a breath signal that varies in response to changes in gas pressure in the breath volume due to the single breath;
• detecting the breath signal increasing above a breath-detection threshold due to the single breath;
• responsive to the breath signal increasing above the breath-detection threshold, identifying a maximum in the breath signal due to the single breath, the maximum being after the breath signal increased above the breath-detection threshold;
• and
• responsive to identifying the maximum in the breath signal, identifying an end-of-breath point for the single breath at which the breath signal drops below an end-of-breath threshold due to the single breath, the end-of-breath point being after the maximum in the breath signal, wherein the sample time corresponds to the end-of-breath point;
• selecting the end-if-breath point as a sample time;
• receiving, from a first analyte sensor, a first analyte signal that varies in response to a concentration of a first analyte present in a sampling volume;
• receiving, from a second analyte sensor, a second analyte signal that varies in response to a concentration of a second analyte present in the sampling volume;
• and
• measuring, for a time period starting at the sample time, the concentration of the first and second analytes in the sampling volume using the first and second analyte signals.

A non-transitory computer-readable medium storing instructions that, when executed by a pocketable hand-held breath analyte device, cause the pocketable hand-held breath analyte device to perform operations comprising:

• receiving, in a breath volume within a pocketable hand-held device, gas exhaled by a user in a single breath;
• receiving, from a sampling sensor, a breath signal that varies in response to changes in gas pressure in the breath volume due to the single breath;
• identifying a sample time by:
• detecting the breath signal increasing above a breath-detection threshold due to the single breath;
• responsive to the breath signal increasing above the breath-detection threshold, identifying a maximum in the breath signal due to the single breath, the maximum being after the breath signal increased above the breath-detection threshold;
• and
• responsive to identifying the maximum in the breath signal, identifying an end-of-breath point for the single breath at which the breath signal drops below an end-of-breath threshold due to the single breath, the end-of-breath point being after the maximum in the breath signal, wherein the sample time corresponds to the end-of-breath point;
• receiving, from a first analyte sensor, a first analyte signal that varies in response to a concentration of a first analyte present in a sampling volume;
• receiving, from a second analyte sensor, a second analyte signal that varies in response to a concentration of a second analyte present in the sampling volume;
• and
• measuring, for a time period starting at the sample time, the concentration of the first and second analytes in the sampling volume using the first and second analyte signals.