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FDC2114EVM: Fdc2114evm functioning erratically?

David Cairnes
Prodigy 20 points
Part Number: FDC2114EVM

We are testing the fdc2114evm for possible use to sense pills exiting a dispenser.  The evm seemed to work on the benchtop when manually dropping the pill. (actually a St. Joseph baby aspirin for testing), onto the sensor. When the evm was placed within a ceramic dispenser, results became erratic at best. The evm was angled at approx. 37 degrees inside the dispenser so a single pill would exit the dispenser. We have tried to change parameters within the oneUI Application 1.9.1 graphical user interface. relating to system configuration and data streaming graph parameters.

Any suggestions? Is the ceramic itself a problem ? Maybe we don't fully understand how the sensor/firmware works.  Is capacitive sensing just not the right sensor?  What might be a better sensor or platform?

Thanks,

David

  • 0
    TI__Expert 8050 points
    Hi David,

    If the EVM is working on the benchtop, then the FDC is working properly. The additional noise you observe in a dispenser may be due to mechanical noises (if there are moving parts/wires) or interference from other electronic components.

    Regards,
    Yibo
  • 0 in reply to Yibo Yu
    Prodigy 20 points

    Thanks for your reply Yibo. We have tried to keep the dispenser mechanism simple as possible. The only moving part is plastic. The tube to actually deliver the pill to the sensor is plastic. The only wire is the usb cable. We can touch the sensor with a small piece of metal and get a reproducible, readable signal every time. But not with the St. Joseph aspirins

    Any suggestions?

    Cheers

    David