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By carefully calibrating a TGS822 sensor, [Jens] was able to measure the acetone content of an exhaled breath along with temperature and ... 19 thoughts on “ Measuring Ketosis With An Arduino ” ...

Nice method and analysis. The temp sensor 3 pin devices are simple and cheap but good for 0.5 deg C precision or nearly a full degree in human measure.

Arduino Board: Serves as the main controller for the CM1106 sensor. CM1106 CO2 Sensor: A high-precision sensor for measuring CO2 concentrations. Dedicated Sensor Shield: Simplifies the connection ...