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ADS1191 to capture eyeblinks

Juliano Rutz
Prodigy 10 points
Other Parts Discussed in Thread: ADS1191, ADS1292

Dear all,

We work on a project that uses a glasses in the mouse function for people with motor disability. The project is in the final stage, but to activate the click of the mouse, we are thinking of putting two electrodes in the glasses of the support region (in the nose), and capture a pulse when one blink. For this we are trying to use the front-end ADS1191, but we do not know how to use.
To start try only tests the chip, but we could not get success. We made the connection pag 53 of datasheet but did not get any signal.
How do we use the highest possible gain of ADS1191?
You can only use 2 electrodes?
Do you have any initial setup to only we test the chip? What?

Kind regards,

Julian Rutz

  • 0
    TI__Mastermind 49916 points
    Hello Julian,

    I've moved this post from the Medical Forum to the Precision Data Converter Forum, where the ADS1191 is supported. I'm sure you'll find an answer here.
  • 0
    TI__Mastermind 38745 points

    Hello Julian,

    Page 7 of the ADS1191 datasheet shows the smallest signals that the ADC can measure. With a gain of 12 and  the lowest datarate, you can measure signals as small as 12.3 uVpp.

    Connecting the ADS1191 for two-electrode measurement requires that the inputs be ac coupled like in the image shown below:

    Regards,

    Brian Pisani

  • 0
    TI__Guru**** 180831 points
    Hi Julian,

    Page 53 of the ADS1191 datasheet only shows the power supply connections. You can take a look at the evaluation module for the ADS1292 which is located here: www.ti.com/.../slau384

    The gain is configured via registers CH1SET and CH2SET - the maximum gain setting is 12. There is also a test signal available inside the ADS1191 that you can use to verify that the device is working - this can be activated by setting the appropriate CHxSET mux bits (see pages 40 and 41).