Embedded data logging platform

 

PrototypeDuring breathhold dives in shallow waters after excessive hyperventilation, the breathing reflex occurs with a time delay. This may help to increase the overall possible diving time, but at the end of the dive the pO2 inside the lungs can reach dangerously low levels that may result in a blackout. In deep breathhold dives the pO2 inside the lungs drops rapidly during ascend. Many accidents occur during the last meters before surfacing, because of the quick drop of the relative pressure.

The idea of the present work was to develop an embedded data logging platform for research in diving physiology that is able to record as many physiological parameters as possible.

We end up with a device, which records:

  • oxygen saturation (SO2)
  • heart rate
  • 2 channel electrocardiography (ECG)
  • water temperature
  • water pressure

All measurements are done in real time. The measured data is stored on a SD-Card in text-files. Thus easy processing with standard programs like MatLab or LabVIEW is assured. The housing is waterproof and pressure resistant to more than 20bar (breath-hold divers have already passed the 200m mark). It is small, lightweight, power conserving and easy to use. Moreover with a standard 1 GB SD-Card the minimum recording capacity is more than 72 hours.

 

This project was done by our team in collaboration with the Scuola Superiore Sant Anna, Pisa, Italy and CNR - Institute of Clinical Physiology, Pisa, Italy.

 

References:

Kuch B, Bedini R, L’Abbate A, Wagner M, Buttazzo G, Sieber A. Embedded data logging platform for research in diving physiology. Proceedings of the Seventh Workshop on Intelligent Solutions in Embedded Systems. 2009:  43-48 (get the paper here).

 

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