Getting very less SPO2 values

[prasanpro]

Dear Protocentral,

I bought the spo2 shield recently and followed the instructions given in this git. Processing graph output values always shows values in range of 60 to 70. A normal healthy person like I should get values in 94+ range. I came across this section after a brief look at processing code:

` AvgYdata[arrayIndex] = (float)receivedVoltage_RED; AvgZdata[arrayIndex] = (float)receivedVoltage_IR; value1 = (float)( AvgYdata[arrayIndex] - averageValue(AvgYdata)); value2 = (float)( AvgZdata[arrayIndex] - averageValue(AvgZdata)); ydata[arrayIndex] = value1; zdata[arrayIndex] = value2;

    float RedDC = (float) averageValue(AvgYdata);
    float IrDC = (float) averageValue(AvgZdata);

    arrayIndex++;
    if (arrayIndex == pSize)
    {  
      arrayIndex = 0;
      time = 0;
      RedAC = s.SPO2_Value(ydata);
      IrAC = s.SPO2_Value(zdata);
      float value = (RedAC/abs(RedDC))/(IrAC/abs(IrDC));

      /********  Emprical Formalae  *********/
      //float SpO2 = 10.0002*(value)-52.887*(value) + 26.817*(value) + 98.293;
      //  float SpO2 =((0.81-0.18*(value))/(0.73+0.11*(value)));
      
      float SpO2=110-25*(value);


      SpO2 = (int)(SpO2 * 100);
      SpO2 = SpO2/100;
      oxygenSaturation.setText(SpO2+"");`

1. Is there any issue in the code or the hardware? Please rectify this issue.
2. Further, the values are not consistent. Sometimes there is big difference between two consecutivve values. Is there any special care needed for finger position.

[adelalfusail]

do you fix this problem or not