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DRV5023: Practical application question

Alexander Baird
Prodigy 35 points
Part Number: DRV5023
Other Parts Discussed in Thread: LDC0851, DRV425EVM, DRV425, LDC1614

Sir / Ma'am,

I am trying to detect the presence of a vehicle within a parking space, and was considering using a magnetometer to do this. It would be mounted to the asphalt in the middle of each space. Consideration would need to be given to ambient magnetic interference from other nearby vehicles, the reliable detection of smaller vehicles such as motorcycles, and any other relevant environmental factors which may cause false readings. Low power consumption is also a top priority. Is the DRV5023 the appropriate IC magnetometer to accomplish this task, or is there another product better suited to this purpose?

Thanks!

  • 0
    TI__Expert 5705 points
    Hi Alexander,

    Thank you for considering TI for your application!

    The DRV5023 is a great option when you're trying to detect the presence of a strong magnetic source (i.e. a permanent magnet or electromagnet) from a distance. For non-contact detection of metallic targets (that are non-magnetic) I would recommend evaluating our inductance-to-digital converters such as the LDC0851 which is an inductive switch.

    I am moving your post to our LDC forum for additional applications support.

    Best Regards,
    Harsha
  • 0 in reply to Harsha Munikoti
    Prodigy 35 points
    Apologies, but after reviewing the LDC0851 I'm not quite sure how that sensor would fit this application. It seems to me that the inductive sensor is close proximity. Given the application of the sensor mentioned in the original post, I can't see how a vehicle would never come close enough to a sensor imbedded into the asphalt to trigger a proximity alert. But maybe I'm missing something?
  • 0 in reply to Alexander Baird
    TI__Mastermind 32260 points
    Hi Alexander,
    You could also look at the DRV425 which is more sensitive than the DRV5023. You would need to measure the change from the earth's magnetic field at the sensor location. To verify this you could easily use our DRV425EVM to detemine this will work. You may need to change Rshunt to increase sensitivity even more.
  • 0 in reply to Javier Contreras4
    TI__Genius 13335 points
    Hello Harsha,
    For an LDC0851 implementation the switching distance is set by the diameter of the inductor coil. You can approximately detect 40% of the diameter in distance. So if the vehicle is ~1ft away from the coil, the inductor diameter should be around 2.5 ft. It would additionally need a reference coil of the same geometry/inductance. If you wanted something with a bit more control on the detection range you could consider an LDC1614 which can detect changes up to ~200% of the coil diameter away and converts the data to a 28bit value over I2C. Take a look at the following blog for more information on the distance capabilities of the inductive sensors: e2e.ti.com/.../inductive-sensing-how-far-can-i-sense
    Regards,
    Luke
  • 0 in reply to Luke LaPointe
    Prodigy 35 points

    Gentlemen,

    Thank you for your speedy responses and contributions to the discussion. While some of my questions have been answered, there are still some which are left open which we should explore further. If it is at all possible, I’d love to speak with you directly so we can discuss in detail the application of the sensor. I can be reached any time at my cell phone, 830-703-0560.

    Looking forward to hearing from you,

    Alexander Baird