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Trying to understand NFC ASK Modulation

BigG

According to my Google search, NFC uses ASK modulation to transmit data:

https://www.rfwireless-world.com/Tutorials/NFC-Near-Field-Communication-tutorial.html

https://www.rfwireless-world.com/Tutorials/NFC-Modulation-and-NFC-Coding.html

Which I have interpreted as the following where the "Mixing Circuit" includes the NFC tuned antenna and two picoFarad capacitors... but what else is needed.

image

As a non electronics engineer I am trying to work out a minimum circuit required.

Then my lofty intentions is to use a Raspberry Pi Pico to generate my clock signal using PIO and as there is also a Manchester Encoding PIO example, I will attempt to use that too.

So could this work, I wonder?

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    It is possible for sure, but its not really a project I would recommend taking on without an oscilloscope.

    So if your looking for an excuse to purchase an MXO4 scope, id say go for it ;) 

    I am Rx/Tx USB-PD with the pio on a PI pico right now which is differential Manchester, so that could provide some inspiration  

  • 0 in reply to scottiebabe

    Agree, unfortunately this is a project that's very unlikely to work, because there's several hurdles here; not just the hardware design and building of the receiver, but also the decoding complexity, it won't be a nice friendly stream of usable data all the time either, there will be noise to deal with so it needs some signal processing as well (can be partially in hardware and partially in software). It's all a major project, not a weekend thing. 

    If the Pico can be replaced with a PC and sound card, then that could make life easier to better understand the challenge and implement on the PC first perhaps, rather than coding for the Pico initially. But the signal would need to be mixed down to see it (e.g. with any SDR project hardware).

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  • 0 in reply to scottiebabe

    Agree, unfortunately this is a project that's very unlikely to work, because there's several hurdles here; not just the hardware design and building of the receiver, but also the decoding complexity, it won't be a nice friendly stream of usable data all the time either, there will be noise to deal with so it needs some signal processing as well (can be partially in hardware and partially in software). It's all a major project, not a weekend thing. 

    If the Pico can be replaced with a PC and sound card, then that could make life easier to better understand the challenge and implement on the PC first perhaps, rather than coding for the Pico initially. But the signal would need to be mixed down to see it (e.g. with any SDR project hardware).

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