felezjoo PI(the best pulse induction metal detector that I made until now)

[gurdal]

I made this modification to the circuit board I'm working on. What do you think?

By the way, I'm still having the same problem, since the detector is picking up the stones, which is annoying.
It might be the cable I'm using, since I couldn't find RG58, so I'm using one from an old microphone.
Also, I installed the 2W potentiometer on resistor 11, and it seems to be working, but the stone detection problem persists.

Felezjoo Pi is a nice device, but it gives off phantom signals in the soil and also signals to bricks. Although the author says the software is full, there is a problem with the ground balance section; even if you change the ground balance, there is no change in the soil.

[Tanu]

I'm having a problem with the coil.
The coil I'm using is 1.8 ohms and 400uH. Do you think that's the problem?
By the way, I'm using this one.
FELEZJOO Rev A-2 (UPDATED 8TH OCT 2021)

What is your coil Auto delay value ?

[sabios]

Today I did a test: I buried a can of tuna 50cm deep with a 50cm coil of 380uH capacitor, and it detected it very well.

I'm not sure if the depth reading is correct, but it seems fine. I did have to make some changes to the hex file because here in Mexico, where I'm from, it was always marking rocks as FE (Features of Light). But with the changes, it works well. Of course, I still need to do more testing.

But I have to say that, after correcting a few errors, it's very good and very stable.

[sabios]

https://www.youtube.com/shorts/OCzBB8s65cQ

This is a video about the metal detector I made. I should clarify that it's a prototype since I haven't received the new parts to build it yet.
I'll upload a longer video as soon as I can.

By the way, I'm only using 13 for sensitivity, but it detects the can even at 10.
I seem to have resolved the problems I was having, like the instability and a few others, but I'll do more testing as soon as the new parts arrive.

[Ruben2000]

Wise ones! Good job, I don't know anything about programming, but it's great that you solved it. Did you make any changes to the circuit?

[sabios]

Well, I'll tell you that I'm currently planning some changes. They're small, but in theory, according to some calculations, they should provide better discrimination, stability, and a bit more depth. But I need to do some testing as soon as I have the parts.

Another thing: I used version 3.35 full as a base, but as some have mentioned, when I installed it and did some tests, it was very unstable, and the ground file was just there in name; it didn't do anything. That's why I made some changes—quite a few, actually—but I didn't want to change the initial presentation or the key programmer's name; I think that would be in bad taste.

As I said, I'll upload more videos as soon as I can, but more comprehensive ones.

[Badim49]

You can share the source code. [email protected]

[Badim49]

Well, I'll tell you that I'm currently planning some changes. They're small, but in theory, according to some calculations, they should provide better discrimination, stability, and a bit more depth. But I need to do some testing as soon as I have the parts.

Another thing: I used version 3.35 full as a base, but as some have mentioned, when I installed it and did some tests, it was very unstable, and the ground file was just there in name; it didn't do anything. That's why I made some changes—quite a few, actually—but I didn't want to change the initial presentation or the key programmer's name; I think that would be in bad taste.

As I said, I'll upload more videos as soon as I can, but more comprehensive ones.

You can share the source code. [email protected]

[sabios]

I'm thinking of selling the full version of the Detector here where I'm from. I'm currently working on the enclosure, but I'm not sure whether to make it myself since I have a 3D printer, or buy them pre-made.
What do you suggest?

Speaking of the topic, when I was editing the program, I made several versions. One surprised me with its live test results, but it was unstable. Another version, as I mentioned, corrected quite a few defects, but as I said, I need to do more testing; it's not ready yet, which is why I said it's just a prototype.

To clarify, this isn't the final version; I'm still working on it. Could someone suggest using 18650 rechargeable batteries to make an 18V version?

There's a version I'm working on that's for sale, as it has some improvements: it's more stable, has greater depth of field, and better discrimination, among other things.

One thing: if you want the complete Felezjoo version for sale, I don't plan to give it away unless I have a percentage of it, since, as I said, it cost me quite a bit to correct all the errors because the complete Hex file is useless.

[sabios]

I forgot to mention that I'm doing this because I'm running out of money and someone suggested I sell it to recoup my investment. I'm still figuring out the price since I'm not very good at calculating it. What do you think would be the best price?

I'm thinking of selling it with a 50x50cm coil; I'm not sure if that's the right size.

And what about the tests? As I said, I buried a 355ml can at a depth of 70cm and it detects it, even with a sensitivity of 10. I also buried a coin at a depth of 22cm and it detects it with my 60cm coil. Finally, I also adjusted or added more margin to the coil, so I can use different coils without getting a coil error.