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IWR6843ISK: Vital signs with people tracking

Lianbo Liu
Prodigy 10 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843, IWRL6432

Tool/software:

To whom it may concern,

I'm using IWR6843 to detect heartbeat rate and breath rate with the visualizer you provided. I have several questions about the results I get. An example screenshot is attached below.

1- What is the x-axis unit and what do those numbers represent? I can tell that it is dependent on the time, so is it the number of sampling points?

2- I found the heartbeat rate doesn't change with time quite well. When the patients change from person to person, the heartbeat is still almost the same. Is it an averaged value over a period? How can I make it more accurate?

3- Where can we check the chirp rate for each demo? And can we change them based on our needs?

Thanks and hope for your answers.

Best regards,

Lianbo

 

  • 0
    TI__Genius 11730 points

    Hi

    Sorry for the delayed response.

    1. The graph represents an internal computational value over time. It does not have any units. X axis is variation of the internal value over time

    2. There are some inconsistencies in the IWR6843 vital chain which could lead to incorrect readings. A person needs to be stationary for atleast 20 seconds for the readings to be correct. IWR6843 vital signs source code is not shared, alternatively you can use IWRL6432 vital signs demo where you can access source code and try any improvements. You can find it at the below location in radar tool box

    radar_toolbox_3_10_00_05\source\ti\examples\Industrial_and_Personal_Electronics\Vital_Signs\IWRL6432_Vital_Signs

    3.Vital signs chain is tightly coupled with the configuration used. It will not work with other chirp configurations as it will fail to detect heart beat and breathing frequencies

    Regards

  • 0 in reply to Abhishek Karkisaval
    Prodigy 10 points

    Hi Abhishek,

    Thanks for your answers. I still have two questions about heart beat detection with IWR6843.

    1- Based on your website information, IWR6843 can also be mounted on the ceiling and face to a sleeping person. I wonder if the visualizer supports this mounting configuration? Since it is for the stationary sleeping person, how does it finish the detection/tracking first? I'm afraid that no data will be displayed.

    2- After being stationary for over 20 seconds, the heartbeat always shows as 87.1 in the screen, which is much higher than what we measured with other medical devices. I wonder what are the possible reasons to case this error?

    Best regards,

    Lianbo

  • 0 in reply to Lianbo Liu
    TI__Genius 11730 points

    Hi

    1. You can mount it on the ceiling and it can perform the heart rate detection. Even though the person is sleeping there would be movement due to breathing which the tracker will be able to detect. Once the person is tracked, it will perform BR/HR detection

    2. The heart rate does not  update in the latest visualizer. Please use the visualizer from the below location

    radar_toolbox_1_30_01_03\tools\visualizers\Industrial_Visualizer

    Regards

  • 0 in reply to Abhishek Karkisaval
    Prodigy 10 points

    Thanks for your answers, Abhishek.

    One more question about this visualizer. I used the visualizer you suggested and now the heartbeat rate is changing with time, but I found the variation is large. I followed the guideline to mount and measure a person's data. The heartbeat is changing from 60bpm to 80bpm with time going on. I wonder if there's a way to make it more stable, or what may cause this issue? I don't think people's heartbeat rate can change that much in practice.

    Appreciate your help and hope for your reply.

    BR, Lianbo

  • 0 in reply to Lianbo Liu
    TI__Genius 11730 points

    Hi,

    There is an error of +/-10BPM with the measurement. This is the limitation due to the algorithm. Heart beat variation when a person is sitting is relatively fixed but algorithm limits the measurment

    Regards