VLF MD with digital signal processing : Bee-Buzz 1

[Atul Asthana]

I'd have much preferred many more experts joining in to share their knowledge and expertise to improve this md further.

my knowledge (and not the expertise) is limited to 30-40 years old signal processing and I guess, a lot of newer knowledge exists that can improve this design.

[Atul Asthana]

I plan to dedicate more time on researching to further improve this metal detector, aiming to maximize the utilisation of microcontroller's processing power to create a distinctive and slightly better device, better than a standard, run-of-the-mill one.

Despite the limitations of using the internal 12-bit ADC, I believe it's possible to reduce the noise floor, enhance the effective number of bits (ENOB), improve target identification precision, and reduce power consumption, and all this at a very low cost.

[Atul Asthana]

Here is the complete project for Keil ARM and the file for displaying data in the MCUViewer program, which is in the Media folder.

https://www.mediafire.com/file/qbp8x...ector.zip/file

https://github.com/klonyyy/MCUViewer

great,


thank you. I will talk to my favorite programmers to experiment, though they seem to be more comfortable with stm32mx cube.

[ivconic]

It's weird, if I want to ask you anything in the future I'll send you an e-mail instead

[Marchel]

Oh I finally figured out what the problem is with pm!
If I click on "Inbox" your message is not there, it simply does not exist.
But if I click on the above "Message Center" then your second message appears!??
Does this defy logic?

It's weird, if I want to ask you anything in the future I'll send you an e-mail instead

[ivconic]

Oh I finally figured out what the problem is with pm!
If I click on "Inbox" your message is not there, it simply does not exist.
But if I click on the above "Message Center" then your second message appears!??
Does this defy logic?

[Marchel]

However, now I only see your first pm from before!?
That's what I'm talking about, those problems with the pm system on the forum.
Here I tried everything and failed to see your second pm?

I wrote you the last message about 05:05 PM

[ivconic]

However, now I only see your first pm from before!?
That's what I'm talking about, those problems with the pm system on the forum.
Here I tried everything and failed to see your second pm?

[Marchel]

Marchel I sent you a pm.
But as always I have problems with the pm system on the forum.
I have no feedback that my pm was sent to you.
Please check if you got a pm from me.
Otherwise, if you want p2p contact; contact me on email: [email protected]
I apologize for breaking into the topic like this and disturbing your work!

Yes, I received a message from you and I replied to you.

[ivconic]

Marchel I sent you a pm.
But as always I have problems with the pm system on the forum.
I have no feedback that my pm was sent to you.
Please check if you got a pm from me.
Otherwise, if you want p2p contact; contact me on email: [email protected]
I apologize for breaking into the topic like this and disturbing your work!

[Marchel]

I will be grateful,

thanks

Here is the complete project for Keil ARM and the file for displaying data in the MCUViewer program, which is in the Media folder.

https://www.mediafire.com/file/qbp8x1mxcuoj3pa/STM32_BluePill_Metal_Detector.zip/file

https://github.com/klonyyy/MCUViewer

[Atul Asthana]

If you are interested, I can add complete files for Keil ARM and STM32 Cube MX.

I will be grateful,

thanks

[Marchel]

excellent excellent

thats a great confirmation.

I recalculated the entire md for 9 khz, improving the Qs and tightening the bandwidth + increasing the siot rates from 256 to 512. my calculated enob is 19, but practicslly, it should be slightly better than 16-17 bits.

If you are interested, I can add complete files for Keil ARM and STM32 Cube MX.

[Atul Asthana]

Today I had time and tried the method that I use in my metal detector on an STM32 BluePill and it seems that direct sampling would work without problems. In my test I tested a TX frequency of 20kHz and I made 16 samples which were then resampled 64x. The main loop runs on RTOS and includes all filters, magnitude and VDI calculation so this is the majority of the code. I attach a printscreen where you can see samples from the TX signal processed in Demodulation(); the frequency of the RTOS loop is about 312Hz.

excellent excellent

thats a great confirmation.

I recalculated the entire md for 9 khz, improving the Qs and tightening the bandwidth + increasing the siot rates from 256 to 512. my calculated enob is 19, but practicslly, it should be slightly better than 16-17 bits.

[Marchel]

Today I had time and tried the method that I use in my metal detector on an STM32 BluePill and it seems that direct sampling would work without problems. In my test I tested a TX frequency of 20kHz and I made 16 samples which were then resampled 64x. The main loop runs on RTOS and includes all filters, magnitude and VDI calculation so this is the majority of the code. I attach a printscreen where you can see samples from the TX signal processed in Demodulation(); the frequency of the RTOS loop is about 312Hz.