I got this setup CN0540 and the CoraZ7-07s [Analog Devices Wiki] getting to work. When i started with this setup, i first used the IIO Oscilloscope Software to get a quick view on the data/FFT because i was interested. I installed the App phyphox on my iPhone and generated a 2 kHz and a 4 kHz signal and held it next to the sensor. In the FFT i saw a peak at 2 and 4 kHz. So everything was looking fine. I then started to create a python script that gets the data from the sensor. I also got this to work. The only problem I have is that I get strange values from the sensor. I leave the sensor on the table while measuring and read out the values. In my Python script I set the rx_output_type to “raw”. In my opinion, I should only get values in a constant area when the sensor is at rest. However, if I carry out measurements at two different times, I get different values. For example, one day the values fluctuate between -300 and -700, the next day the values suddenly fluctuate between -2158100 and -215600. I have no idea why the values vary so much although I have not changed anything in the hard- or software. Do you guys have any idea why the values are behaving like this or how to investigate on this? I then tried the IIO Oscilloscope again and to my surprise, i wasn't able to recreate the 2 and 4 kHz example. When i hold the iPhone next to the sensor, i can't see a peak anywhere. Why is that and could this have the same cause as the strange values?
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