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TDC1000-TDC7200EVM: Cannot receive any data in Mode 2

Abbie
Prodigy 40 points

Part Number: TDC1000-TDC7200EVM

I am having difficulty reading any form of data when I switch the settings of the firmware to Mode 2. I have attempted many different configurations of all the settings including the settings described in Bahram Mirshab's document (3603.Interfacing a water flow sensor to TDC1000...). I am able to capture data on the graph on the firmware and can save the data in the file when the firmware is set to Mode 0, but nothing when it is set to Mode 2 (I select start graph but no data shows on the graph and no data is saved to the file despite the PCB blinking as if it were reading data and the bottom of the firmware saying "Reading Graph Data Successfull"). I am using a different pipe than the one used in Bahram Mirshab's document, so I am not sure if that is the issue or if there is an issue with something else. I have included the link to the pipe I am using below.

Please help if you can!

http://www.audiowell.com/en/product-detail.aspx?id=264

-Abbigail

  • 0
    Prodigy 40 points
    Hi,

    After further testing, I have now been able to receive data in Mode 2 (pipe filled with water in the attempt to have approximately zero difference in time of flight). I had been keeping my pipe (with sensors on top and 45 degree angles) stationary while I was attempting to test it. However, once I turned the pipe upside down (sensors on bottom part of pipe) or vertically, I started receiving data. Can anyone explain why the position of the sensor stops the firmware from collecting/detecting data?

    -Abbie
  • 0 in reply to Abbie
    TI__Mastermind 31655 points
    Hi Abbie,

    It is most likely because the pipe is not completely filled with water. Even the slightest amount of air (perhaps from bubbles introduced when filling) will create a small air gap at the top. This air gap is in the path of the sensors when the pipe is oriented with the sensors on top, and will greatly attenuate the signal to the point of the receiver not seeing a signal. When testing zero flow measurements I recommend orienting the pipe vertically so the bubbles and air gap do not interfere with the firing path of the transducers.

    Regards,