mbvalentin

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About mbvalentin

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  1. As @[email protected] mentioned, I was able to make the code work. I am actually very thankful for all the help he provided me through the process. To be honest I am not entirely sure what I changed, exactly, but my guess is that the values were not read correctly from the registers of the AD5933. Here are some personal tips when using the pmodIA: 1) Be careful when picking the right combination of Feedback resistor (RFB), PGA Gain and Output Range voltage Something very interesting that I found is that the actual implementation in the pmodIA is the one recommended by Analog Devices on the CN0217 Ci
  2. Hello to everyone. First of all let me say that I already posted this question, by mistake, in the 'New users introduction' forum. As I don't know how to move it to another section I decided to start this new thread. In case the administrators consider it necessary I will delete my last post. That said... I recently purchased an pmodIA board for a project we are conducting at work. The main goal is to obtain some resistivity vs frequency spectra for different objects as part of a object characterization problem involving Oil/Gas stuff. I already read the guide that digilent guys pr
  3. @[email protected], I marked this post as Urgent just to let anyone interested on answering know that it's not a DIY weekend project, but rather that it is important for my work. Sorry if that sounded like I considered this post anyhow more important than the rest of them. Today I spent the day looking for some inconsistencies or errors in the sign-bit (two complement) conversion as @[email protected] suggested. This is my updated code: pmodIA_test.tar. For those who aren't familiar with the pmodIA, in order to calculate the impedance you have to read the values of 4 registers: 2 of them to read the real part of th
  4. Hello to everyone. I recently purchased an pmodIA board for a project we are conducting at work. The main goal is to obtain some resistivity vs frequency spectra for different objects as part of a object characterization problem involving Oil/Gas stuff. I already read the guide that digilent guys provide (http://store.digilentinc.com/pmod-ia-impedance-analyzer/) and I found some C libraries for the AD5933 (https://github.com/analogdevicesinc/no-OS/blob/master/Pmods/PmodIA/AD5933.c and https://github.com/analogdevicesinc/no-OS/blob/master/drivers/AD5933/AD5933.c). I am using a Ra