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ADS1298 Application Assistance

kpbr
Intellectual 520 points

Hello all,

I'm not sure if this is the best location for this post, but...

I'm trying to further refine a prototype for monitoring respiration rates on humans. My current prototype leverages the ez430-rf2500 development kit. It has worked extremely well for getting my idea up and running. The sensor I'm using, however, isn't ideal for the application, but it works. I am looking for some resources/help in finding a better sensor solution.

Let me know if you would be interested in hearing more details or have experience in this area of work.

Thank you for your time!

  • TI__Guru**** 182851 points

    Hi kbpr,

    Sure!  We'd love to hear about your experiences.  What sensor are you using now, is the circuit something you can share with us?  There are a variety of ways to determine respiration rate, so please do let us know what your key care abouts are (power consumption, accuracy, costs, etc.) and perhaps we can offer you a better solution.

  • in reply to Tom Hendrick
    Intellectual 520 points

    Tom,

    Thanks for your interest! To start, the prototype uses a Celesco string linear potentiometer and an ez430-RF2500 development kit. The Celesco was chosen because it is cheap, rugged, and provided a great way to measure movement. The ez430-RF2500 kit was chosen because it allowed us to rapidly develop a prototype with wireless capabilities (plus it is small).

    The Celesco sensor provides a voltage divider output, which varies as the string is moved. Because of its size (and application), we did not implement an analog front end to reduce weight. The output of the sensor is connected to the input of an ez430-RF2500 target board.

    The RF2500 target board connected to the sensor reads the voltage divider output, performs an ADC, then sends the samples to a receiver (another RF2500 target board), which is connected to a personal computer on a USB port. We then pull in the samples, from the USB port, to an application which implements an algorithm to calculate a respiratory rate.

    If this description isn't clear, or you need further detail or clarification, please ask. While the Celesco sensor has worked for the prototype, it does have some drawbacks, physical size being one of them. After all, it wasn't designed for this application. Our current prototype has performed excellently in testing, now I'm looking for ways to improve.

    Thank you for your time!