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

[6666]

Schematic has been completed, but just need to check it over before posting.
Cannot do it now, as I need some sleep.

Thanks

[Qiaozhi]

Just ordered a ATmega328P-PU for this project a schematic would be usefull.

Schematic has been completed, but just need to check it over before posting.
Cannot do it now, as I need some sleep.

[6666]

Just ordered a ATmega328P-PU for this project a schematic would be usefull.

[koohyar]

Iron Reject: (iron removal)
This setting is similar to the GPX Minelab series , And by a complex formula of iron diagnosis, is done.
OFF value means the ability to remove iron is disabled, and the values of 1 to 30 also enable this feature, specify the degree of iron removal.
Whatever the number, the higher the setting, making removal more difficult and can even lead to the removal of other metals.
If this setting is enabled, and the sense of iron is detected, the audio output will be cut off, but the graphs and meters as well as number sense and resolution, LCD screen will continue to show the objective sense.
Working with this parameter and calibration of the device, according to the conditions of manufacture, and loop environment to explore, with important points that will be described below.
Set this parameter for each loop is different, and should be in the right condition for the different loops and away from metal annoying, tested and see what degree, the iron removal loops do so for the same loop, set the same degree, Note that higher and put this parameter can be the result of confusion, and the elimination of non-ferrous materials as lead, after testing must be accurate and consistent, this parameter set.

[Qiaozhi]

By "The design is nothing special" do you mean that this design is poor or it's just simple?
Do you think it can offer some advantages being suggested by koohyar

I didn't mean to imply that the design is poor. My meaning was that it is a fairly standard [and simple] design, as far as the electronics are concerned.

Hi my friends
in this Iranian forum design this detector and until it update(my means HEX file)
good things in this detector is reject iron and have VDI like VLF detector so it has positive point to another PI.
now,any body here can analysis it? or in this forum have many detector ,why any one don't design digital deep PI whit disc?
regards and excuse for my English

The claim that it rejects iron would need to be examined more closely, but I highly suspect the so-called target ID and iron rejection is based on target conductively, and is not true ferrous/non-ferrous discrimination like a VLF. For example, you can adjust the GB control on a White's TDI to reject small iron targets, but the results are highly dependent on the shape, size and orientation of the target. If anyone can show a video that demonstrates this detector rejecting various ferrous targets with different shapes and sizes, while still accepting all other targets, I would be amazed.

Also, according to the "parts list / description", it appears that the sample delay needs to be around 20us for the iron reject to work. However, what is meant by "work" is open to debate. A video would be helpful.

[mohandes]

Hi my friends
in this Iranian forum design this detector and until it update(my means HEX file)
good things in this detector is reject iron and have VDI like VLF detector so it has positive point to another PI.
now,any body here can analysis it? or in this forum have many detector ,why any one don't design digital deep PI whit disc?
regards and excuse for my English

[eclipse]

By "The design is nothing special" do you mean that this design is poor or it's just simple?
Do you think it can offer some advantages being suggested by koohyar

[Qiaozhi]

OK,
obviously there is no schematic for it out there. I downloaded the files when our forum member Mohandes posted them some time ago and etched the PCB. Now it is about 80% populated and i stopped because of another project (PD3200).
From the document that is written in Persian we get information about this detector after translating. It should not be that hard to make a schematic from the PCB files, just a matter of time and motivation. After i read about all the options of this detector i decided to switch back to it . I hope to have it finished this weekend and to report.

I couldn't resist it!

The design is nothing special. It uses an 18V 2.4A Li-ion battery pack, with a TX pulse rate of 200pps, and a TX pulsewidth of 150us. Average current consumption is 100mA.

The TX MOSFET is an IRF840 that drives the coil directly (no series resistor to limit the current). The coil is 380uH (1R0) with a 390 ohm damping resistor. The preamp is a single stage with a gain of 80dB (x10000), that feeds directly into ADC0 of the Atmega. The preamp is AC coupled to the coil, so there's no need for a null-offset adjustment, and the opamp supply is +/- 6V with a virtual ground. ADC1 is used to measure the battery voltage. The only other [digital] inputs go to the keypad. Outputs are to the LCD and the speaker driver.

The design has been back-engineered onto paper. Schematic (in PDF) coming soon ...

[turboaleks]

OK,
obviously there is no schematic for it out there. I downloaded the files when our forum member Mohandes posted them some time ago and etched the PCB. Now it is about 80% populated and i stopped because of another project (PD3200).
From the document that is written in Persian we get information about this detector after translating. It should not be that hard to make a schematic from the PCB files, just a matter of time and motivation. After i read about all the options of this detector i decided to switch back to it . I hope to have it finished this weekend and to report.

[koohyar]

hi friends
i find this video that posted with one of members in Persian forum.
you can see that a plate with 20 centimeter diameter sensed with 60CM spider coil from more than 190CM.
of course this isn't the final power and if you see the LCD lend that sensitivity is 18 and if the system be out and far from metals the sensitivity can be more and the power will be more too.

http://www.aparat.com/v/lz1P7

you can go to the main forum and see more videos.
thanks.

[koohyar]

Thx for your new P.I. design but please post some youtube links
so we can see it in action.

btw. only a very few here have the equipment to write code to the atmega328 -
especially after it was already soldered on the PCB!
So what do you think how they are able to update the chip if the counter has hit the 300?

As long as those problems aren't solved people will go for other P.I.s
no matter if the Felezjoo is the best or not.

And the big question also is:
Does this pi works with an 1m coil because pi has a pretty low recovery speed
which makes it more interesting for special tasks which are more low speed.

greetings.

hi
you can go to the main Persian forum and see that the topic is more than 1150 pages and a lot of members made it.
see the link

https://www.felezjoo.com/viewtopic.php?f=8&t=2182

this PI is very simple and fully digital, there isn't a problem to making it.
you must to read the PDF file to finding your questions answer.
this detector has a many different menu that really is very singular.
for example the automatic delay finder is one of the special trait that give this ability to the system for matching with any coil.
don't forget that you can, with management the Features such as :Sensitivity , Frequency regulation ,Adjustable pulse width and delay ....use any coil.
i friendly recommendation to making it.
good luck

[Qiaozhi]

Dear friend
This is a fully digital detector, and all options controlled by micro .
In addition, the hardware is very simple design and the parts is limited.
So, with seeing the schematic, no body can comment about the system .
The designer also has specific reasons to refrain from publishing the schematic.
Good luck.

In your initial post you said: "And I think it is the best system that has ever been given for free to the public."
Since the project is free, it seems sensible to supply a schematic. Especially since it would be a relatively simple job for most people here to back-engineer it from the information you've supplied, given that "the hardware is very simple design and the parts is limited".

And ... before anyone else asks:

1. Can you supply some detection distances for various targets in air?

2. Do you have details of the coil? Mono / DD, diameter, inductance, etc.

3. You also stated: "iron reject and Target ID (The numerical separation of various metals)". Presumably this is based on separation by conductivity?

[Funfinder]

Thx for your new P.I. design but please post some youtube links
so we can see it in action.

btw. only a very few here have the equipment to write code to the atmega328 -
especially after it was already soldered on the PCB!
So what do you think how they are able to update the chip if the counter has hit the 300?

As long as those problems aren't solved people will go for other P.I.s
no matter if the Felezjoo is the best or not.

And the big question also is:
Does this pi works with an 1m coil because pi has a pretty low recovery speed
which makes it more interesting for special tasks which are more low speed.

greetings.

[koohyar]

Dear friend
This is a fully digital detector, and all options controlled by micro .
In addition, the hardware is very simple design and the parts is limited.
So, with seeing the schematic, no body can comment about the system .
The designer also has specific reasons to refrain from publishing the schematic.
Good luck.

[Qiaozhi]

No schematic?