Arduino metal detector?

[FoxyLab]

I read your web site (used Chrome translator) and very nice project and write up.
Also read your explanation of discrimination with Neural nets. Very interesting.
Have you been able to add this neural net into your detector?

Thanks!!!
Version 4 is canceled. Everything turned out to be simpler - I made a software emulation of the integrator and the filter, which provided the desired stability and sensitivity.
"Air" and "underground" tests of the new version 3.3 -

(for discharged batteries and at approximately matched coefficients it turned out not so bad).

Studies with the neural network I did for the static version of the metal detector.
I will try add discrimination to current version MD with motion mode.

[dbanner]

Very good. You have super slow motion detector. Why is there always high tone after low tone? What is the use of that except for being extremely annoying?
Is it supposed to help in pinpointing the target? If so, may I suggest you make it a little shorter in duration. Or maybe you plan for ferrous/non ferrous in future with low and high tone?
We appreciate sharing with us your work. Thanks.

[FoxyLab]

Very good ... We appreciate sharing with us your work. Thanks.

Very thank for the support!!!

You have super slow motion detector

It is necessary to choose the optimal coefficients of the integrator and the filter

Why is there always high tone after low tone? What is the use of that except for being extremely annoying?
Is it supposed to help in pinpointing the target? If so, may I suggest you make it a little shorter in duration

Low Tone - movement of the coil to the target (signal increases) ; High Tone - movement of the coil from the target (signal decreases) (Yes, is good for pinpointing - my little "know-how" , but tone length required tuning)

[dbanner]

[FoxyLab]

Added the ability to work the metal detector in static (non-motion) mode:

Switching between dynamic (default) and static modes - by long pressing the button.
Static mode can be used for pinpointing, as well as the main search mode (stability is sufficient).

[FoxyLab]

You have super slow motion detector

An increase in the pulse repetition rate up to 80 pps markedly increased the detector "responsiveness".

[Funfinder]

Didn't had user Hammerhead from Egypt also built some Arduino MD?

If he is still around just a tip:
Nokta Makro Anfibio - Full Water Proof - perfect for Beach and Diving!
Import from Turkey via Lebanon to Cyprus - by Speed-Boat! *laugh*

[Hammerhead]

Didn't had user Hammerhead from Egypt also built some Arduino MD?

If he is still around just a tip:
Nokta Makro Anfibio - Full Water Proof - perfect for Beach and Diving![ATTACH]46007[/ATTACH][ATTACH]46008[/ATTACH][ATTACH]46009[/ATTACH]
Import from Turkey via Lebanon to Cyprus - by Speed-Boat! *laugh*

Hello my friend, I am now working on the Pirate Metal detectorUnderwater

[FoxyLab]

With the addition of the autotune of the initial delay and the duration of the analyzed signal, the development of FoxyPI version 3.3 can be considered complete.

Summary:
pulse metal detector operating in non-motion and motion modes;
setting parameters through the menu, audiovisual indication;
The default parameters are a pulse width of 150 us, a repetition rate of 80 pulses per second.

Main electronic components:
Arduino Nano 3.0, LM358N, MOSFET.

The detection range of targets in the "air" test in non-motion (in a notion a little less) mode:
(the test was carried out with the batteries discharged to 1.3 V , therefore, the data are understated)
golden ring - 9 cm
coin 5 rubles - 15 cm
HDD plate - 33 cm
Something like this

[6666]

Thanks for the update Foxylab, what is the frequency of your main electricity supply in your country 50/60 Hz, does it cause your detector any problem ?

[FoxyLab]

Thanks for the update Foxylab, what is the frequency of your main electricity supply in your country 50/60 Hz, does it cause your detector any problem ?

50 Hz.
Samples sums integration successfully solves this problem

[waltr]

Nice work FoxLab. Nice simple PI detector.

Samples sums integration

I am guessing this is a software implementation of the op-amp RC integrator found in most PI detector circuits.

I have written code to do this op-amp integrator functionality and it does increase sensitivity and decrease noise.

[FoxyLab]

Nice work FoxLab. Nice simple PI detector.

Very thanks!!!

I am guessing this is a software implementation of the op-amp RC integrator found in most PI detector circuits.

Yes, simple integration formula with exponential decay (AC-integrator). But i integrate samples sums for each TX-pulse but not separate samples.

[Funfinder]

Hello my friend, I am now working on the Pirate Metal detectorUnderwater

Salam, I am happy for your reply and that you can built a good detector now!
I saw complete series Chameleon with Haifa, now I know Egypt better. *laugh*
Very "hot" country, perhaps homebrew MD will be the best solution for you.
Sending detector by post-parcel from Turkey to correct person might work.

[Funfinder]

Hammerhead - the ingenious solution is:
You must order a used and broken Anfibio from Turkey - for half the price
and after passing the military control, you can make it work again! *laugh*

btw. my vibration circuit (see schematics) might be useful for under water.