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JColvin last won the day on August 3

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About JColvin

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  1. Hi JColvin,

    I'm trying to use a Teensy to communicate with the PmodIA to retrieve impedance values. I found your example code online, but I'm running into errors during the calibration step - it seems to enter the FrequencySweep, but gets caught during the loop. We noticed in one of your posts that you said you had to make a small edit to the code to make it work. Do you have any idea what might be wrong with what we're doing? Please let me know, thanks.

    1. JColvin


      Hi iloveteensy,

      I presume you are referring to this post - and at the time I thought it would be a small change to get everything nicely fixed, but as I was looking into it more I found two problems: one is that there is more than one small change that would need to be fixed. The second is that there is no convenient way to know if you are saturating your ADC on the PmodIA with whatever impedance you're measuring. Consequently, I have not had the time to dedicate towards solving this problem. The library code that I was using is available on our Wiki here (Wiki is down at the time of writing though). On the (potentially) bright side however, the user in this post was able to get the PmodIA working as they expected without using the PmodIA library and just writing directly to it (they also used 3.3V instead of 5V). Other co-workers of mine claim that they were able to get the PmodIA working on their first fry without modifying anything, although I haven't looked into what they did differently than me. If you have any questions, please post them in the Digilent Forum (probably the Add-On Boards section) and I'll do my best to make sure your question gets addressed.