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MSP430FR5994: Using LEA for time-frequency analysis to detect a FIRE using PIR sensors

Genius 12090 points

Replies: 3

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Part Number: MSP430FR5994

Support,

You mention the ability to batch PIR processing on the LEA in the following blog post.  https://e2e.ti.com/blogs_/b/industrial_strength/archive/2017/08/17/designing-with-pir-motion-detectors-part-1?tisearch=e2e-sitesearch&keymatch=fire%20detection

Can you give me an idea of if and how this can be done using the LEA of the MSP430FR5994?

Thanks,

Marc

  • Hello Marc,

    Thank you for your question.

    The main idea behind this blog and especially the reference design TIDA-01069 is to use the continuous wavelet transform (CWT) on the received signals through the PIR sensors in order to have a specific signature for different kind of motion.

    In the reference design TIDA-01069, the CWT has been done through matlab.

    But if you want to implement the CWT in a MCU, you should do the computation for the CWT in the frequency domain.

    The wavelet transform it's basically many convolution product between the signal and the wavelet.

    But if you do same operation in the frequency domain it will be more efficent in term of computation capabilities, since convolution in time domain it's just a multiplication in a frequency domain.

    As you mentionned the MSP430FR5994 has a LEA and will help you to accelerate the signal processing and the FFT...

    In this reference design is shown how to use the LEA and implement the FFT with MSP430FR5994.

    http://www.ti.com/tool/TIDM-FILTERING-SIGNALPROCESSING.

    There is also a GUI which comes with the reference design TIDA-01069 and display in real time the data and the CWT.

    https://dev.ti.com/gallery/view/demos/PIR_Motion/

    Thanks,

    Regards,

    Bilal

  • In reply to BMA:

    Hi Marc,

    It's been some time since you have responded, so I will assume the information provided to you was helpful.

    Dennis Lehman

  • In reply to Dennis Lehman:

    Dennis,

    I'm good now. Thanks for the detailed response.

    BR
    Marc

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