Andras

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Everything posted by Andras

  1. Thanks to you @7M4MON and @fusionimage I could compile and install everything both on Ubuntu and Raspbian. My joy isn't complete just yet, but I'll update my progress on GitHub as I try to make it work on Windows 10 too: https://github.com/7m4mon/gr-ad2/issues/1
  2. @fusionimage Did you manage to make it work? I opened an issue for @7M4MON on GitHub, because I'm new to GNU Radio and I can't seem to make it work. I got errors because of missing blocks: https://github.com/7m4mon/gr-ad2/issues/1 Could you guys help me with this?
  3. Thanks @attila for the tips! I would like to ask for your help: what would you do if you wanted to measure two (fluid) samples at the same time over and over? For my current experiments I would need to measure the capacitance of one sample and another sample as a control. I'm willing to build a small hardware if I need to, but I really would like to use AD2 and WaveForms to make it happen. Plan A is that I start up two WaveForm instances, one with AD2 and one with the Sound Card option, and I would create a small extension (with fixed resistance) to my soundcard following the diagram
  4. Thanks @attila, that's good to know! I might use my PC soundcard as a signal generator, it looks an easier workaround for now
  5. @attila That's pretty cool! Also, I'm not sure if this was there in the previous versions, but I really like the "Pick screen color" function, because I like to use RGB gradient tool (http://www.perbang.dk/rgbgradient/) to get my gradient colors. 👍 Anyway, I have a question relating to my next phase of my experiments: is it possible to use the BNC Adapter with the Impedance Analyzer? I would need to stimulate something with a signal generator while doing the capacitance tests over and over. As I quickly tested it, the Impedance Analyzer module seems to be not working
  6. Hi guys, Today I created a mixture with tap water and glucose just as before. I made a short (3.3 minute-long) and a long (2.7 hour-long) experiment. I made a test with water + glucose mixture and then I did the test once again after I put the baker's yeast into the mix. I focused on both the impedance and capacitance values. Here are the results for the short test: The blue is the tap water for reference. The two reds are the water + glucose combination. I made the two measurements approximately 60 minutes apart, but I also made sure that they have the exactly same
  7. Alright, I finished the tests for today, here are the results. I used "traditional" yeast now, and not the brewer's yeast as before. (A - blue - left) 27 Celsius water + 2.5g glucose + 2g yeast (B - red - middle) 27 Celsius 2.8% milk + 2.5g glucose + 2g yeast (C - green - right) 50 Celsius 2.8% milk + 2.5g glucose + 2g yeast [please note that all the temperatures converged to our room temperature in the end to 28 Celsius] The following two pictures were taken 5 minutes (light color) and 120 minutes (darker color) after mixing the ingredients together.
  8. Hello @Cleber Borges Today I tested a few things: I made a measurement before and after cleaning the electrodes and I did the same before and after I whirled the mixture. Neither of them modified the values, which is good news. I have found one interesting thing though: if I make the impedance measurement while the temperature sensor is submerged in the mixture, it distorts the values in the 20-25 Mhz range. I use a multimeter to measure the temperature, so from now on I will not keep its probe in the mixture, and I will put it into the fluid only for a few seconds when I actually
  9. Alright, so I made 9 consecutive measurements in 10 hours on both tap water and the yeast + sugar + water mix. The results for the water are the following: And results for the yeast: The values are changing for both over time, which is expected, but there are a few strange things: - The first tests for both are not in line with the changes happening later, they look off. - The amount of changes for both samples are similar, does this mean that it doesn't matter if it's something living like the yeast or non-living like tap water? - I'm not sure what t
  10. Hi @Cleber Borges and @attila, Sure, my electrodes are simple wires fixed at a certain distance from each other, and they look like this: Do you know what kind of electrodes researcher normally use when they do EIS? It's interesting that you just mentioned the voltages, I tested them as well, because I feared that the high voltages would make changes in the target fluid especially if it's a living thing, like yeast. So here is the test I had, comparing the different amplitudes/voltages: Probably it isn't obvious on the screenshot, but the 5 mV - 50 m
  11. Before I continued my tests with beer, I wanted to make sure of two things: a, the amount of the sample fluid does not influence the impedance values b, the measurement itself does not change the sample fluid so that its impedance is changed at every measurement For case A, I made 3 references with 1 cup, 2 cups and 3 cups of tap water. I used the same source and the same container for all the measurements. Then I made 3 other measurements of the same 3 cups of water. At this point I can conclude that the measurements are fairly harmless, there is
  12. Hey guys, I've made some experiments that could be interesting for your as well. I put tap water into my ceramic container, I heated it to different temperatures and measured the impedance every 5 degrees. You can see the values between 60 ° Celsius (140 ° Fahrenheit) and 5 ° Celsius (41 ° Fahrenheit). Red is 60 Celsius, blue is 5 Celsius and there are 10 steps between them.
  13. @attila, could you also rename the "Close" button in the reference properties dialog to "Delete", please? It tricked me when I tried to rename a reference and I clicked on the close button afterwards (it removed the reference trance altogether). Also, could you make the column on the right hand side with the trace and references horizontally resizable? If I define longer reference names they are not visible. Thank you!
  14. Szia @attila, That's awesome, thank you, I really appreciate it! I'm looking forward to the changes!
  15. I did a quick experiment with different liquids. All of them are in a small ceramic container. The blues (Ref1, Ref2 and Ref5) are tap water. The red (Ref3) is salted water. The green (Ref4) is carbon-filtered tap water. I just put both the + and - wires of the Impedance Analyzer into the container and I made sure they are not directly connected. Here are the results: Cool stuff!
  16. @Cleber Borges, I'm sorry to hear that! I had to wait a few weeks as well here in Hungary, but it wasn't as bad as in your case. If you have no other option, let me know, I buy you one here and send it to you to Brazil. If you had the Impedance Analyzer, how would you make the measurements? I saw your other post: The Impedance Analyzer has only two wires: + and - So, would you put just those two wires into a liquid and run the Impedance Analyzer tool in WaveForms? Would you expect to get consistent result for the same type of liquids? Thanks! Andra
  17. Hi guys, This is a fascinating topic! @Cleber Borges, did you end up using AD2 as a FRA (Frequency Response Analyzer)? Do I understand it correctly that you did experiments with fluids? Did you get consistent results? Could you share your settings with us? Thanks, Andras
  18. Hi, I use WaveForm 3.11.5 and I would like to be able to import a previously exported Scope FFT, Impedance Analyzer and Network Analyzer data. The exports work fine, and it's pretty good for working with other tools that can handle .csv. On the other hand, it would be great to have the ability to import these values later to compare them with the ones we are measuring. I could imagine it as a new reference type, so we could import even multiple files, name them and choose colors for them. What do you think, @attila? Regards, Andras
  19. Szia @attila, Now that Raspberry Pi 4 Model B is out, do you see any chance that WaveForms will work with it?
  20. Hmm, it looks like I configured my Audacity to use 32-bit float sampling by default, and it loads every WAV as it were 32bit-float. Strange, and a little misleading, I need to be more careful next time, because that lead me to believe that 32-floats are supported in Python. My bad, sorry. Anyway, I'm testing the script, I have a few questions: The vAmplitude is the amplitude of the wavegen and as I change it I can confirm the change in the WAV file. The scope also has the vAmplitude parameter, set to the same value as the wavegen. What does that exactly mean for the scope? If both
  21. Szia @attila, Cool, I'll try it right away. The mistake I made is that I supposed that FDwfAnalogInStatusData returns 32-bit floats, not 64-bit doubles. Also, I didn't know about FDwfAnalogInStatusData16 which returns 16-bit integers. The other problems arose from this wrong presumption... Python's wave supports both the 16-bit integer and the 32-float format, but not the 64-float.
  22. Hi, I combined a few python scripts from the SDK (AnalogIn_Acquisition, AnalogOut_Play and AnalogOut_Sine) to write a script which is intended to run during the night and save the scope's data into a WAV file. All looks somewhat okay, but there are a few things that don't look perfect. For this test, I connected CH1 and W1 and started both the Scope and Signal generator in the script. I'm intending to generate a 80 Hz sine wave and record it with the scope running at 8 kHz. I attach the whole script, and here are the important parts: # set up signal generation channel =