Ferrous and no-ferrous

[alber_gold]

Hello, my name is Alberto and I'm from Valencia (Is-pain). Take this opportunity to introduce myself to the forum.
Assemble the kit a few days ago Surf PI 1.2 but I've been surprised that does not discriminate ferrous and non-ferrous metals.
Where I live is full of waste and scrap. It is impossible to step without detecting junk.
Does anyone know any scheme to mount a detector with discrimination?
Am working on designing a metal detector discrimador. I use the pic 16F873 and I program in asembler. I get to distinguish between iron and aluminum but very vaguely. In the received signal, checked with an oscilloscope, there is a slight difference between iron and aluminum but I can not find more information.
Sorry for my bad English. Use the Google-translator.
I appreciate all the suggestions.
Greetings to all fellow members. This forum is spectacular.

[joop]

Designing a discriminating Pulse Induction detector is not easy. It is better if you build a different type of detector, the Induction Balance type. The most popular on this forum is the TGSL detector.

[alber_gold]

Very thanks joop. I go to study it. Regards.

[6666]

I use the pic 16F873 and I program in asembler.

Would you be interested in shareing your work here ?

[kt315]

alber, your first experience in metal detectiing building was perfect if you get a result. yes, PI is for beach hunting uppermost. you do not find here in forum PI with perfect disc because minelab chief ingineers are on serve here. these projects will be prohibited or commited by their attacking. PI schematic with disc is another level of difficulty. many folks did begin projects PI with disc - no result was got.

[alber_gold]

Would you be interested in shareing your work here ?

6666 Friend:
If I am willing to share my research with you, in this forum.
This forum really helped me a lot.
"It is well born to be grateful."
This is my experimental code for 16F873 micro.
Now (12:34 UTC) I'll eat. This later upload the schema.


In anticipation, the pic uses pin RB, 7 for detecting a rising edge.
The RB pin, 5 is the ADC input, pin RB, 3 is the Vref = 2.50 volts.
All PORTB is the binary digital output capture. You can dock a DAC
weighted resistor to hear the output.
The RB pin, 3 is a witness rising edge detection.
Everything works with crsital 4,000 Mhz.
The Vcc = 5.0 V


I gather that the 12-bit ADC is insufficient. At least need a 24-bit ADC and
the micro operate at 20 MHz (40 MHz better).
THIS CIRCUIT IS ONLY EXPERIMENTAL.
USED TO STUDY THE CONCEPTS OF PI AND POST TREATMENT.




Thank you all.

[alber_gold]

alber, your first experience in metal detectiing building was perfect if you get a result. yes, PI is for beach hunting uppermost. you do not find here in forum PI with perfect disc because minelab chief ingineers are on serve here. these projects will be prohibited or commited by their attacking. PI schematic with disc is another level of difficulty. many folks did begin projects PI with disc - no result was got.

Dear kt315:


Translation from google-translator was confused.


I understand that some people have tried to discriminate metals with a PI and was not possible ..... (?)


I really do not know if it is possible or not, I am newbie-but I see the signals on the oscilloscope and gives me hope to get it.
With your permission I will continue investigating to figure out whether or not I'm able to get it.


I do not know exactly what happens with Minelab (?). My works are mine and unfoldment from 0. No person, firm or entity on this planet that prevents me from developing my own circuits. Jobs in I+ D for many years and I will not retire now.


Please use simple sentences kt315 me. Treat me like a baby for five years. I'm sure what you say is very interesting but the result of the translation is ambiguous and do not know if I interpret it correctly.


Receive a greeting and thanks for your answer.

[alber_gold]

Hi, this is my set coils for tests.



This is my favorite coil. In Surf PI 1.2 detect 1 euro coin at 10". It detect a wire with 0,3mm diameter and 10mm long at 1". Surf PI 1.2 is very sensible. I like it.




This is the TX-PI and the RX for my tests. It works. It is only a prototype.




This is my 16F873 schematic. Only test.



And this is my osciloscope signal :-)




....

When detect ferrous ZONE-1 is a few more up.
When the target is very close or very large target ZONE-3 negative values.

Combining with the ADC values captured in ZONE-1, ZONE-2 ZONE-3 can deduce the type of metal detected. It is what I think and what I'm working on.

[Qiaozhi]

Last edited by alber_gold; Today at 12:57 PM. Reason: asembler code for micro....I cant upload it like 873-PI-2.asm sorry

Compress the assembler code and upload as either zip or rar.

[alber_gold]

Compress the assembler code and upload as either zip or rar.

Sorry I cant it.
Can you delete the asembler code ?
I cant it ?
Thanks and sorry for inconvenience.

[Qiaozhi]

Sorry I cant it.
Can you delete the asembler code ?
I cant it ?
Thanks and sorry for inconvenience.

You will need make a new post and then use the Manage Attachments button to add the assembler code.

[alber_gold]

Hi, I figured that but I see "manage attachments for anywhere."
Can you delete my code?
I'll upload it when I learn to do.
Excuse my ignorance. Patience.
A greeting.

[Orbit]

alber_gold hello !

Probably thought that by the assembler
switch to hex fail !
it's not about hypocrisy !
greeting !

[alber_gold]

My .asm and .hex code

PI_873_2_3.rar
My .asm and .hex code.

[Orbit]

Ok !That's it .