VLF MD with digital signal processing : Bee-Buzz 1

[moodz]

Great retort
but no positive contribution to the project !
you could have instead, volunteered to write the code.

I can't help but feel like you're expecting the entire project—lock, stock, and barrel—tested and working, be handed to you on a silver platter, and on top of that, you are demanding that it fits neatly into your schedule!

Sir, the world doesn’t quite work that way any more.

Everyone has their own priorities and timelines to manage. Projects on these kind of forums are driven by best efforts, so you’ll need to roll with the pace and contributions of others.

After all, good things take time, especially when they are under a 'collaborative' endeavor!

Not arguing ... but your logic does not make sense. I mean somehow you have turned it around and its our fault now ? If you had been straight up with the proposal and as you admit you are not so well informed in this area of expertise ( aka metal detectors ). Also as a somewhat uninformed person on this matter you somehow go missile lock on the blue pill as the target solution. Hate to harp on but the ESP32 is streets ahead of the blue pil because it has wifi and bluetooth which means your user interface hardware is much easier ( leaving processor speed aside ) and though some bang on about the non linearity of the ADC ... the facts are it does not matter for VLF because the non linearity is a constant distortion ... we are not measuring voltages we are doing frequency domain sampling. The wifi and bluetooth along with arduino development makes it a piece of cake develop a detector.

Also some basic web research skills would help too .... here is a VLF detector project for the ESP32 with an APP for your phone ( every kid seems to have one nowadays ) its ready to go !!!
lf you really have to why dont you port it to the blue pill ?

https://github.com/folny/ESP32_Metal...ster/README.md

best regards.

PS you can get a ESP32 for the same cost or cheaper than a blue pill.

[Carl-NC]

I thought the projects on this forum were meant to be collaborative efforts, where others would step in when needed.

Some are, some are not. Throughout this thread it's sounded as if this is a project you intended to do (both hardware and software) and wanted feedback on the intended direction. Then, suddenly, you asked if anyone can write the code for you. I don't think anyone saw that coming. Maybe next time make it clear your intentions.

Most people here already have projects on-going. I have several. And, from the feedback, I think many people would do this project differently, both with hardware & software. Maybe this thread will help spark interest in someone making a direct-sampling VLF, but it may be completely different than your proposal. Maybe you could take one of your STM Blue Pills and start writing code for the TX PWM, get that working first. I think that alone will be somewhat difficult.

[Atul Asthana]

I have a feeling we are the ones who have been coded.

Great retort
but no positive contribution to the project !
you could have instead, volunteered to write the code.

I can't help but feel like you're expecting the entire project—lock, stock, and barrel—tested and working, be handed to you on a silver platter, and on top of that, you are demanding that it fits neatly into your schedule!

Sir, the world doesn’t quite work that way any more.

Everyone has their own priorities and timelines to manage. Projects on these kind of forums are driven by best efforts, so you’ll need to roll with the pace and contributions of others.

After all, good things take time, especially when they are under a 'collaborative' endeavor!

[Atul Asthana]

I was under the impression you were going to write the code.

Great assessment

But let me do a fundamental analysis.

I thought the projects on this forum were meant to be collaborative efforts, where others would step in when needed.

Since my current work isn't related to engineering, unlike for many of you, I’ll need to take time off to focus on my writing the code, which likely won’t happen until after the financial year ends (March 31). (and I've stated this earlier too, including, in the meantime, getting some one else to write the code)

That’s why I asked for volunteers to help write the code, so we can get the project up and running as quickly as possible. This is a collaborative effort, which is why it's shared on the forum. If I intended to do it all alone, I wouldn’t have posted it here. Instead, I would have built the metal detector myself, added more features, and possibly offered it for sale.

I see no issue if someone else writes the code. in fact, We could have multiple parallel efforts, and perhaps someone might even do a better job than me. knowing that many of you have tech background, I’m confident that most of you are far more skilled in technology, math, and coding than I am.

So any volunteers ?

[moodz]

Start with a PI This one uses Blue Pill. https://www.hackster.io/mircemk/diy-...ino-ide-194703

[moodz]

I have a feeling we are the ones who have been coded.

[dbanner]

I was under the impression you were going to write the code.

[Carl-NC]

Sir, if we want to quickly breathe life back into this 'dead' project, you could take the lead by writing the first version of the code. The hardware is already simple and low-cost—it's the code that's holding things up.

I was under the impression you were going to write the code.

[Atul Asthana]

So, this project finished, or died?
Or was he still-born?

Great question.
Sir, if we want to quickly breathe life back into this 'dead' project, you could take the lead by writing the first version of the code. The hardware is already simple and low-cost—it's the code that's holding things up.

Given that every tiny component has been thoroughly explained, dissected, and analyzed, writing the code shouldn't be an issue. It's time to move beyond waiting for some one else to take the initiative and contribute directly to getting this project back on track.

[boilcoil]

So, this project finished, or died?
Or was he still-born?

[Atul Asthana]

This is the real reason you insist on using the Blue Pill ... why was this not clear up front. This information would have saved alot of thinking time. LOL

Yes sir,

this is the reason.

and 'the thinking time' was deliberately not meant to be 'saved'

Before involving students, it was important to ensure that there is a strong interest and support from the expert community, as proper guidance is crucial to keep students motivated. I also wanted the experts to evaluate the design to provide students with a functional metal detector design idea they can complete and proudly showcase, which could inspire their peers and lead to exciting treasure hunting adventures.

Building this metal detector offers students practical, hands-on experience in a project that many dream of undertaking/owning/using. It gives them the chance to explore a real-world challenge, enhancing their problem-solving skills and teaching them to maximize performance in constrained environments. The experience gained will significantly boost their resumes, showcasing their ability to work on complex, multidisciplinary projects.

Through this project, students will develop skills in electronics, instrumentation, mathematics, signal processing, and material sciences—skills that are essential in industries such as medical technology, space exploration, military applications, automotive, consumer electronics, and communications. My goal is to encourage students globally to expand their learning beyond the classroom and engage in innovative, interdisciplinary projects.

[moodz]

I encourage members of this group to introduce this VLF metal detector 'Bee-Buzz 1', project to college students, highlighting its suitability as an educational and hands-on project. This initiative offers students the chance to apply various technologies learned in the classroom to real-world scenarios, utilizing their mathematical and signal processing skills to tackle practical sensing and instrumentation challenges. It also provides an opportunity for students to interact with a community of experts beyond their academic environment, fostering parallel, out-of-the-box thinking to overcome the complexities that arise.

The project is particularly appealing due to its low costs and minimal hardware complexity, making it manageable and accessible for students. They will need to address real-life issues like analyzing target and ground responses, requiring clever thinking and a broad understanding of material and environmental properties. Furthermore, in more advanced iterations, students can integrate machine learning / neural networks, pushing the boundaries of traditional metal detection technology.

This project is an excellent platform for students to innovate and develop, with special encouragement for girls to participate and contribute their unique perspectives and ideas. By engaging in this project, students can develop their skills, gain practical experience, and play a pivotal role in evolving this technology into something truly remarkable.

This is the real reason you insist on using the Blue Pill ... why was this not clear up front. This information would have saved alot of thinking time. LOL

[Atul Asthana]

I encourage members of this group to introduce this VLF metal detector 'Bee-Buzz 1', project to college students, highlighting its suitability as an educational and hands-on project. This initiative offers students the chance to apply various technologies learned in the classroom to real-world scenarios, utilizing their mathematical and signal processing skills to tackle practical sensing and instrumentation challenges. It also provides an opportunity for students to interact with a community of experts beyond their academic environment, fostering parallel, out-of-the-box thinking to overcome the complexities that arise.

The project is particularly appealing due to its low costs and minimal hardware complexity, making it manageable and accessible for students. They will need to address real-life issues like analyzing target and ground responses, requiring clever thinking and a broad understanding of material and environmental properties. Furthermore, in more advanced iterations, students can integrate machine learning / neural networks, pushing the boundaries of traditional metal detection technology.

This project is an excellent platform for students to innovate and develop, with special encouragement for girls to participate and contribute their unique perspectives and ideas. By engaging in this project, students can develop their skills, gain practical experience, and play a pivotal role in evolving this technology into something truly remarkable.

[Atul Asthana]

If the prototype design were up to me, I would build it on this STM32H7 board, which also has a 16bit ADC and a small LCD that is enough for common information. On the top side of this board, I would connect a board with a few buttons and on the bottom side, a board with TX, RX and an audio amplifier.

https://vi.aliexpress.com/item/10050...Cquery_from%3A

Great,

Feel free to develop your own version of the metal detector prototype using any processor or codec combination of your choice. There are no restrictions on how you approach the design, as I haven't imposed any limitations.

The design is essentially a detailed description and is fully open-source, encompassing all developments made thus far. I encourage you to build your prototype, test its performance, suggest enhancements, and share your results with the community. By doing so, we can all benefit from each other's insights and learn collectively.

After all, I am sure that Carl and others would agree with me, that fostering innovation and collaboration is what this forum is all about.

[dbanner]

Looks like phase can be readily synthesized with Goertzel.