Richard,
i think i post #41 and #44, the graph was a bit better in terms of highs and lows. Dont know if the last configuration and modification in LPF made it easier to identify those highs and lows.
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Re: Heart rate sensor MAX30102
Richard,
i think i post #41 and #44, the graph was a bit better in terms of highs and lows. Dont know if the last configuration and modification in LPF made it easier to identify those highs and lows.
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Re: Heart rate sensor MAX30102
Have you checked to see if you actually have a pulse for this thing to read? Maybe you're dead and don't even know it?? Try it on someone else as a verification? Just joking...
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Re: Heart rate sensor MAX30102
hehehehe, sure i will do that. Just to check what will be the values on a different person, as i know my average Heart pulses are always around 82-90 Bpm.Originally Posted by mpgmike
I will find someone with much lower and more normal heart pulses like 62-75 bpm.
The following is my measurement right now.
(measured as well with the Samsung Galaxy Sensor 80 Bpm)Code:lpf 31 11 63 11 68 83 68 109 TEMP: 22.68 000F7E26 OverFlows 0 7932 1EFC 7928 7915 7838 7927 7925 7843 7926 7929 7818 7924 7921 7833 7924 7938 7815 7924 7933 7810 7919 7899 7812 7917 7916 7824 7919 7940 7811 7917 7916 7819 7918 7936 7825 7918 7928 7810 7918 7930 7820 7918 7930 7813 7918 7931 7813 7918 7926 7823 7919 7933 7812 7920 7935 7824 7921 7932 7821 7922 7935 7820 7921 7923 7823 7920 7922 7828 7921 7932 7825 7923 7943 7815 7922 7921 7819 7923 7939 7810 7924 7936 7823 7923 7925 7828 7926 7950 7827 7924 7923 7825 7924 7936 7821 7925 7942 7836 7923 7924 7812 7922 7921 7824 7924 7943 7818 7923 7929 7813 7924 7935 7825 7924 7933 7830 7922 7917 7824 7924 7943 7831 7925 7946 7811 7924 7928 7822 7924 7938 7839 7926 7952 7803 7925 7928 7827 7926 7941 7839 7927 7947 7819 7924 7916 7816 7927 7957 7842 7930 7958 7826 7930 7933 7820 7930 7932 7822 7931 7947 7821 7929 7925 7825 7930 7943 7827 7930 7935 7814 7928 7918 7840 7928 7936 7818 7927 7929 7827 7925 7919 7829 7925 7937 7819 7926 7946 7822 7926 7936 7812 7925 7929 7828 7925 7938 7827 7925 7933 7816 7925 7936 7834 7925 7938 7822 7928 7957 7821 7927 7928 7820 7928 7940 7809 7929 7942 7814 7927 7918 7830 7927 7938 7802 7926 7925 7814 7926 7932 7825 7926 7932 7813 7924 7923 7809 7924 7936 7830 7925 7940 7831 7926 7942 7824 7925 7926 7826 7923 7924 7811 7923 7928 7826 7926 7950 7834 7925 7930 7808 7924 7930 7826 7924 7932 7842 7926 7948 7807 7926 7934 7817 7927 7941 7831 7927 7937 7815 7925 7917 7833 7926 7945 7813 7926 7932 7796 7924 7922 7818 7924 7939 7806 7922 7921 7812 7924 7940 7811 7924 7936 7808 7922 7918 7821 7921 7924 7823 7923 7943 7804 7923 7925 7809 7924 7934 7817 7924 7939 7815 7923 7931 7806 7921 7915 7816 7921 7925 7809 7920 7923 7822 7920 7925 7822 7922 7947 7808 7922 7925 7817 7922 7929 7817 7922 7928 7820 7922 7926 7823 7923 7933 7832 7927 7959 7804 7925 7919 7812 7926 7942 7822 7924 7918 7809 7924 7935 7818 7924 7936 7813 7922 7923 7813 7923 7937 7818 7925 7941 7801 7922 7914 7818 7922 7929 7836 lpf 0 7 52 33 71 82 117 109 TEMP: 24.96
Last edited by astanapane; - 17th January 2022 at 22:40.
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Re: Heart rate sensor MAX30102
looks like simplistic lowpass filtering of the data to obtain pulse will never give a
reliable and repeatable result, it can deliver a nice picture but that is as far as it goes.
i will need to learn a bit more about dsp techniques. first step, remove dc component i think.
don't hold your breath, got more paid work this week
Warning I'm not a teacher
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Re: Heart rate sensor MAX30102
Richard this is already lots of work, and i dont know how to thank you for all this.
I believe that this will be useful for many people in the forum in the end. (even if noone else is involved).
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Re: Heart rate sensor MAX30102
I think Richard is eluding to a process called Fast Fourier Transform, FFT for short. The filter is a mathematical equation applied to each result. In many cases, the previous result is part of the equation. FFT is used to filter noise out of cell phone signals, among other things. The magic is getting the FFT formula right for your application. I've looked into it briefly, just enough to get an idea of what it's about, but not enough to actually use it effectively. I do know there are "standard" FFTs that are go-to works-every-time-its-tried that would probably work for you.
The one that is like Example #1 in the textbooks is simply:
This simply plots trends of increasing or decreasing values, without specific concern for the actual value.Code:if Result > Previous Plot += 1 elseif Result < Previous Plot -= 1 endif Previous = Result
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