Fix IR and RED values interpretation from Arduino#3

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RVillani wants to merge 2 commits intoProtocentral:masterfrom RVillani:master

+12-12

Commits on Jun 6, 2017

Averages all values in the spo2_array, without skipping the first 50.
RVillani
committed
Fix interpretation order of the IR and RED values from Arduino, giving a correct result for (RedAC/abs(RedDC))/(IrAC/abs(IrDC)).
RVillani
committed