DIY 'ECG' Machine: Testing Feasibility of Wave Transference

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Aha it was the low battery tank warning causing the error.

I was just kidding about spending too much time "resting on PF".

or was I. ;) The %O2 error depends on the accuracy of the constant current regulator at low voltage and how that affects the amplitude and ratios of IR / R or is it R/IR, light detected. I forget.
 
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An off-topic discussion about Traditional Chinese Medicine has been deleted. Since we have addressed the OP's questions and they haven't been back in several weeks, the thread will be closed now. Thank you to all for your contributions and ideas for the OP.
 
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