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Respiration in ADS1298R with user generated signals

Dinu
Intellectual 335 points
Other Parts Discussed in Thread: ADS1298R, ADS1298

Hi,


Am using ADS 1298R module. Am getting respiration data with internal circuit with internal signals without any issues. But when I tried to use internal circuit with user generated signals, am getting only the junk data. Here what I have done.

  • My respiration register value is 0xF3;
  • Changed the JP36 jumper to connect with J6.
  • Generated a 0.5Hz signal and gave it to the J6 slot as input.

Can anyone help me in solving this issue and please explain the use of MSP430 here?

  • 0
    TI__Mastermind 38745 points
    Hey Dinu,

    If you look to page 46 of the ADS1298R datasheet, you can see the details of the respiration functionality. The "internal circuitry with user generated signals" requires that you produce your own modulation, demodulation, and blocking waveforms at the desired modulation frequency and provide them at the GPIO pins described in that section. Since that is not what you are trying to do, you may ignore that functionality in the EVM software. In general, settings in the software change registers on the ADS12898R, not board level configurations.

    The MSP430 provides the option to "simulate" respiration in the case that you do not have a patient simulator available or if you're just trying to test functionality. With the correct jumper placements, the ADS1298 will measure "respiration" created by a resistor network whose resistance is changing with the MSP430's signal. However in this case you wish to control the "frequency of respiration" since you have changed the jumper.

    Change the register back to "internal respiration with internal signals" and give your 0.5 Hz signal and you should be able to measure the "simulated" respiration with a rate of 0.5 Hz. I am wondering, though, what benefit do you gain from this? Is the signal produced by the MSP430 not sufficient to test the respiration measurement functionality?

    Instead are you looking to measure actual respiration from a patient simulator or signal generator? if that is the case, you just need to change JP34 and JP35 to their alternate connections in which they are connected to the electrodes.

    Regards,
    Brian Pisani