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IWR1443: Bin level sensor 77-GHz up to 0-35 foot measurement

Joshua Sorenson
Prodigy 30 points
Part Number: IWR1443
Other Parts Discussed in Thread: TIDEP-0091,

Looking for help finding the best suited radar solution to measure material in a feed bin. We would like to sense up to 35 feet with 2-4 inch or better resolution. The material in the bin will range in consistency from flour to rice. Based on my research so far we should be in a higher frequency such as the 77GHz models to have a narrower beam. 

Ultimately, we need the finished product to output a 4-20mA signal relative to the distance from the sensor face to the material in the bin. We plan to add the 4-20mA drive circuit, but will need the sensor to output a digital signal. 

Which radar IC is the best suited for this application?

Is there a dev kit we can use for this suggested IC to gather sample readings?


  • 0
    TI__Guru 50240 points

    Hi Joshua

    I would recommend looking at the TIDEP-0091. This design interfaces the IWR1443BOOST board with the MSP-EXP432P401R Launchpad for use in a 4-20 mA low power system.

    There are some hardware modifications required on the IWR1443BOOST board that are illustrated in the getting started guide.

    Do you have any specific power requirements?

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Prodigy 30 points

    The radar sensor will give out a 4-20mA signal but does not need to run on loop power as it can have a 3rd wire for grounding. However, if it ran on 2-wires and loop power that would be a bonus. Basically, there is no power requirement. Also, the material in the tank moves very little, so an update frequency of 5 minutes would be plenty fast.

    Does the IWR1443 need an external MCU for this application? Would if be possible to output a PWM signal from one of the IWR1443 pins which could drive an RC circuit into an op amp to make a 4-20mA drive circuit? 

  • 0 in reply to Joshua Sorenson
    TI__Guru 50240 points

    Hi Joshua

    Sorry for the delay, I am getting more information regarding PWM capability and will provide an update later this week.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    TI__Guru 50240 points

    Hi Joshua

    I can confirm device does have PWM capability and it can drive a 4-20mA circuit, though there are currently no software drivers for running PWM. Please see the Technical Reference Manual  for more details.

    Also this app note please see this app note for more info on 4-20mA implementation.

    Regards,

    AG