protocentral/afe4490_oximeter

This pulse oximetry shield from ProtoCentral uses the AFE4490 IC to enable your Arduino to measure heart rate as well as SpO2 values.

afe4490_oximeter's Issues

STMF103RB

Hello,
Using this microcontroller with AFE4490 Breakout Board Kit and Pulse Oximeter Shield I have the same bad problems:

• 1st method is loading examples from Arduino Library won't compile due to redeclared "RESET" , so the next step like using OpenView doesn't matter.
  

• 2nd method is loading manually examples from:
  https://github.com/Protocentral/AFE4490_Oximeter/tree/f59b2d74fc27a488b90e599e8cf3954cacc0a3a0
  which compile successfull and the R/IR LED are lighting, but after open dedicated software Processing GUI, the PPG-graph is only flat.

I really haven't idea what to do, try much combinations buy finally my set-up doesn't work correctly. Additionally OpenView 64-bit return error log after chosing Port COM and Device so I try to use 32-bit. Please contact

Pulse Waveform

Hello,

I am using this shield as part of a larger device and I am relatively inexperienced with Arduino. I have somewhat of an understanding of the code, however, I was wondering if you could provide some guidance for the extraction of the raw pulse waveforms? I am trying to graph the waveform along with waveforms from two other probes (one ear PPG and one ECG). Any help is much appreciated! Thanks!

How to invert the ppg signal

The ppg signal obtained through this code is an inverted graph nah? therefore i want to invert the ppg signal t get the proper output for my project. Also my project is to calculate hemoglobin concentration, how can i modify the above code to calculate hemoglobin concentration.

I want to get the ppg signal as below

Porting this code

Hi guys,

I am trying to use this with a raspberry. I used this code and the BCM2835 for hardware management (GPIO etc....).

Most is working (communication, SPI, spo² value seems correct..) but the heartbeat is very unstable (78bpm then 150 then 90...).

Can you point at extra care to have to get this code working on another target? I have seen the "FS" constant that is supposed to be a sampling frequency, but I don't know how to adjust it for my target.

Thank you very much for your help.

Pin configuration

Hi,
I am using the ProtoCentral AFE4490 Pulse Oximeter Breakout Board Kit with my Arduino UNO. I am following the instruction and it works as expected.

However, the same code is not working with Arduino UNO WiFi Rev 2.

I need some help in this regard.

Thanks.

Maitreya

Help

Hi guys, I'm having trouble getting this to work. I followed the instructions as best as I could. Unfortunately I'm not getting any readings. When I click the run button, I'm able to select the port and press start but I do not get any readings. The RED PPG is a flat green light while the IR doesn't register. No SpO2 value is displayed.

I'd be grateful if you could help me as I am inexperienced with such projects.

finger probe is not working

hi from the first time I run the shield with arduino the probe sometimes it is work normally and sometimes I it is not working it need to disconnect the port many times to work normally please tell me what to do

Layer 2 and 15 in brd

The layer 2 and 15 have any function? There isn't any wire or polygon connected

Best Regards

Getting very less SPO2 values

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.

Issue when running Processing

I followed the instructions on the Github page, and when running the .pde files in Processing, I got this error:

===================================================
G4P V4.0.4 created by Peter Lager

ControlP5 2.2.6 infos, comments, questions at http://www.sojamo.de/libraries/controlP5
################ EXCEPTION IN EVENT HANDLER ################
An error occured during execution of the eventhandler:
CLASS: openview_pulseox METHOD: start_click
Caused by java.lang.NullPointerException
openview_pulseox.start_click(openview_pulseox.java:829)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
g4p_controls.GAbstractControl.fireEvent(Unknown Source)
g4p_controls.GButton.mouseEvent(Unknown Source)
g4p_controls.GWindowImpl.mouseEvent(Unknown Source)
sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
processing.core.PApplet$RegisteredMethods.handle(PApplet.java:1436)
processing.core.PApplet.handleMethods(PApplet.java:1638)
processing.core.PApplet.handleMouseEvent(PApplet.java:2749)
processing.core.PApplet.dequeueEvents(PApplet.java:2652)
processing.core.PApplet.handleDraw(PApplet.java:2493)
processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1547)
processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:313)
##############################################################

What would cause this error? I am using the version 2 pulse oximeter shield.

About PPG

Hi brother,

It is not an issue, but I have some doubt in ppg probe. Brother whether you are using Transmissive probe or reflective sensor.

The polarity in D1 D2 D3 and D5 in sch is incorrect, but in pcb is correct

The polarity in D1 D2 D3 and D5 in sch is incorrect, but in brd is correct

How is this different from the MAX30102 ?

Ratio Question

Hi,

Would someone be able to explain the line of code (line 436) below and why the numerator is multiplied by 100? Also, possibly what the dc_max represents on the actual PPG signal?

an_ratio[n_i_ratio_count]= (n_nume*100)/n_denom ; //formular is ( n_y_ac *n_x_dc_max) / ( n_x_ac *n_y_dc_max)

Thank you