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  #41  
Old 04-10-2019, 12:47 PM
waltr waltr is offline
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Looks good. Think I saw you posting this on the Geotech forum.

I do need to figure out how to use a translator for your web site. I looked through it and seems lots of good info from the pictures and diagrams. Just need to read the text.
Got it - Chrome translates.
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  #42  
Old 04-11-2019, 11:58 AM
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Originally Posted by waltr View post
Think I saw you posting this on the Geotech forum.
Yes, I replied you there.

I made a software emulation of the integrator and the filter, which provided the desired stability and sensitivity with motion mode.

"Air" and "underground" tests of the new version 3.3 -
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  #43  
Old 04-13-2019, 02:54 PM
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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).
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  #44  
Old 04-15-2019, 02:36 PM
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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 Ás, 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
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  #45  
Old 04-22-2019, 03:09 PM
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The first result of the first garden search with FoxyPI v3.3:
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  #46  
Old 04-24-2019, 02:40 PM
waltr waltr is offline
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Originally Posted by FoxyLab View post
The first result of the first garden search with FoxyPI v3.3:
You must be detecting in my yard. lol
I find lots of nails bent like that.
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  #47  
Old 04-24-2019, 03:39 PM
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Originally Posted by waltr View post
You must be detecting in my yard. lol
I find lots of nails bent like that.
I made many different finds with version 2 of FoxyPI (including, of course, many-many nails).
This is the first find in the first real search with version 3.3. Ahead of a lot of interesting
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  #48  
Old 04-24-2019, 03:41 PM
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Interference from LCD TV:
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  #49  
Old 04-25-2019, 02:30 PM
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Firmware for testing of FoxyPI v3: https://acdc.foxylab.com/sites/defau...aloginputs.hex
In test mode, the metal detector generates a current pulse with a duration of 150 μs in the search coil after switching on, and then it displays the received signal on the screen. Pressing a button generates a new impulse, etc.

Examples of signals:
1 - without target, 2 - with target:
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  #50  
Old 04-27-2019, 02:57 PM
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The result of the second garden search with FoxyPI v3.3:
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  #51  
Old 04-27-2019, 09:46 PM
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This is a very nice project. I plan on making a coin tumbler. Thinking about using an arduino but a simple 555 timer and pot would be simpler. Nice to see combining two hobbies into one. Keep up the good work.

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  #52  
Old 04-29-2019, 02:28 AM
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Originally Posted by Bajanick View post
This is a very nice project. I plan on making a coin tumbler. Thinking about using an arduino but a simple 555 timer and pot would be simpler. Nice to see combining two hobbies into one. Keep up the good work.

Thanks
My first homemade metal detector was also analog, but digital MD FoxyPI turned out to be more convenient and sensitive.
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  #53  
Old 06-10-2019, 04:21 PM
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One of the finds after electrolytic cleaning:
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  #54  
Old 06-19-2019, 01:57 PM
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Originally Posted by FoxyLab View post
My project foxyPI v2 - pulse induction Arduino based metal detector
Video: https://youtu.be/ikJbqUCbyvw
Schematic:

Description (in russian): http://acdc.foxylab.com/node/47


What would happen if you changed the pulse amplifier size? 😁
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  #55  
Old 06-20-2019, 02:11 AM
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Originally Posted by MrLostAndFound View post
What would happen if you changed the pulse amplifier size? 😁
My english is bad.
What is "pulse amplifier size"? Length and width of LM chip?
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  #56  
Old 09-17-2019, 07:47 AM
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I have drawn FoxyPI v3 schematic in KiCad (click the thumbnail for zoom):
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  #57  
Old 09-17-2019, 08:43 AM
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Awesome project! Designing and building your own machine is super impressive Thank you for sharing.
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  #58  
Old 09-17-2019, 09:22 AM
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Originally Posted by Mike (CA) View post
Awesome project! Designing and building your own machine is super impressive Thank you for sharing.
Thanks!!!
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  #59  
Old 09-19-2019, 12:26 PM
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I built a model of the entire power part of my metal detector for LTspice XVII:
FoxyPI_v3_tran.asc

You can play with the parameters and watch, for example, the voltage on the search coil (1), on the opamp input (2), the current in the coil (3):

Last edited by FoxyLab; 09-19-2019 at 03:05 PM.
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