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Found 21 results

  1. Hello! I am a student in the United States, and I am fairly new to coding, so I apologize in advance if the answer to my questions are relatively simple. I am trying to use the PmodIA board with a Teensy LC. Is this possible? I am using the Arduino IDE and have uploaded the library from the following link: https://reference.digilentinc.com/reference/pmod/pmodia/start?_ga=2.217729375.87039399.1596572684-1671610707.1594657381 Specifically, I downloaded the "Library and MPIDE Example" zip file. I made a couple of edits to the library cpp file in the IA() function--I was getting an
  2. Hello all! How would one go about measuring the capacitance using the PmodIA? Specifically, how would you calibrate the board, and does anyone have any thoughts on which gain-setting resistor, output excitation voltage, and PGA gain to use? Thanks!
  3. The PModIA has two SMA connectors as the terminals between the impedance to be measured. These connectors apparently have a 50 Ohm impedance. Does this impedance need to be accounted for when taking impedance measurements using the board? I haven't found anything in the documentation mentioning this. Because there's two connectors, would the impedance be doubled to 100 Ohms? I figured when calibrating the board with a test resistor, I would have to add 100 ohms to whatever that resistor value is.
  4. Hello! I am trying to add external clock (32KHz) to the PmodIA for low frequency generation, however, I have no idea how to change the Arduino code, could anyone tell me how to modify my arduino code or even library to make things work? The code works good calling internal clock, the information is attached below. Thanks for the help! External Clock information: https://www.digikey.com/product-detail/en/abracon-llc/ASFLK-32.768KHZ-LJ-T/535-9546-6-ND/1882844
  5. Hi, I am using example code that I got from GitHub to try to read the impedance through Arduino. On the reference guide that digilent provides, there are a series of steps you have to take to calculate the correct impedance. All of those functions are already written, but I do not know how to calibrate the AD9533. I know it says something about a reference resistance, phase, etc., but I am unsure if I am supposed to put the reference resistance in between the SMA connectors and then once it has done a sweep to calculate the gain factor. Am I supposed to insert the reference resistor first
  6. Dear Anyone Hello. I am a grad student in mechanical engineering at UMD and I am trying to use the PmodIA to measure the impedance of a sensor. I currently have it attached to an Arduino Zero and I am having trouble connecting the two together (Pmodia and the Zero). I am wondering if there is code out there that can be used to have to two communicate together or if I have to come up with my own. I have tried using the Library and MPIDE example on the reference page and it states that I am missing almost all of the reference libraries. Any help anyone can provide or lead me in the r
  7. Hi there, I bought a couple of pmodia boards very recently, and tried to communicate with it using chipkit u32. I carefully read the manual of ad5933 and pmodia as well (i2c communication stuff in particular). Then, I tried to use the demo code to start talking with it via chipkit u32. However, it did not respond. I checked the code, and figured that it stuck since the status register never gives out a "ready" bit to read temperature, etc. Not matter how I command it to initialize sweep or perform temperature measurement. The output from the status register (0x8F) is always 0111 0000. Then, I
  8. I am facing problem in interfacing the PMODIA AD5933 board with ARDUINO UNO. I am using the attached Library and Program to find out the impedence, phase and frequency measurement. It is running if the start frequency is set to 1000 Hz in the program. The problem is I'm calibrating with RFB = 100K and Rcal = 100K but the impedance is coming in negative value. PMODIA AD5933 Board Connection with ArduinoUNO Board is : SDA--> A4 SCL--> A5 VCC--> 3.3V/5V GND-->GND ad5933-test.ino arduino-ad5933-master.zip
  9. 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
  10. Hello guys, I am trying to extend PmodIA from 2 electrodes to 4 electrodes (for better accuracy). I got some paper talking about how to do that directly from AD5933 chip, but I see there is already some electrical components integrated on the PmodIA board, so I am trying to figure out the circuit. The attachment is PmodIA scheme and I highlight the part which I am trying to understand. 1. I believe this is high pass filter to move the offset. 2. I believe this is Op-Amp, but why do we need this? 3. I think this is a switch or multiplexer, but why do we need this here?
  11. Hello, I am unclear on whether the PmodIA works with Arduino. If I get the digilent arduino core will I be good to go, or do I need a digilent board to use it? Also, is it possible to modify the pmodia to use it on lower frequencys/impedance so it could be used for batteries? Thank you!
  12. Hi everyone Our senior design team is doing a project and we need to use 3 pmod ia on raspberry pi at the same time. Now I have questions following: 1. Does JA, JB, and JC all support pmod IA 2. I need the way to control three pmod IA, but I pmod IA is not in the design spark pmod supported list. Does that mean I can't use design spark to control pmod IA. 3. Since design spark might not work with pmod IA, I read the question of @mbvalentin, that's the only example of pmod working on raspberry pi I could find, but does the wiringPi still work if I use a hat between pmod
  13. I have been trying to get the pmodIA working with the chipKIT uC32 using MPIDE 0150. After hooking the I2C pins on the pmodIA to the uC32's dedicated I2C pins on J11, Vcc to 5V or 3.3V, etc. , successfully uploading the example sketch to the board and running the IA_Test() function, the session fails to proceed upon trying to interact the pmodIA. I downloaded and installed the associated libraries and such about a week ago. Here is what I've been getting on the serial monitor: PmodIA Demo Press 'r' when ready!! IN test 128 Then nothing else happens, presumably due to th
  14. Hi , I have PmodIA module which im trying to use it to measure water conductivity with arduino uno . I tried to use the example code available IA_Wire but its seems not working for my application . i just need to read the Real Value nothing else . The value im looking to measure is between 100 ohm to 100Kohm . I tried to calibrate the module by using Zcal 100 ohm but had no luck the value is away from what im looking for . Im not sure if im following the right calibration steps which its available on the datasheet. If you could help on easy way to do please post . The
  15. 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
  16. I soldered on an external 16 MHz clock to the PMod IA, it was sending data out, and the oscillator was clocking at 16 MHz but there was no fluctuation in sensor impedance. I an worried I might have over heated the board or oscillator. What type of solder is used on the solder pads of this board? Katy
  17. Which platforms or Platforms will be best to support the C++ example code for the PMODIA impedance analyzer? Is there and easy modification for using Arduino?
  18. Please, I need information about pModIA impedance analyser. I am using Arduino UNO connected to a pModIA to measure impedance. The Arduino codes work with some modifications of ChipKIT example. My question is how to do the calibration? Could someone send me a picture or schetch showing how to make pModIA connections to the component under test (DUT)? My project is very simple, I just want to measure the impedance of a fixed resistor at different frequencies. I'm having difficulty in understanding the connections and using the pModIA to measure this impedance. The pModIA manuals show no illustr
  19. Please, I need informations about how to physically connect PModIA to the circuit for impedance measurement. Can someone send-me a schematics? Thanks.
  20. Please, I need informations about how to use, setup, connect, calibrate and configure the PModIA Impedance Analyser in an Arduino Leonardo board. Is there a video tutorial?
  21. Hi, I'm about to buy the PmodIA board. I'm wondering where can I get the probes for the board? Thank you.