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  #61  
Old 09-29-2019, 11:51 PM
Professor1701 Professor1701 is offline
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How is your metal detector design circuitry similar to or different from commercial designs? What commercial detectors are available in Russia? I have been using White's Electronics machines for many years and never really thought about the guts that make them work. Wish I had learned more electronics in school, this is super impressive work you are doing, congrats!
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  #62  
Old 09-30-2019, 03:00 AM
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FoxyLab FoxyLab is offline
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Originally Posted by Professor1701 View post
Wish I had learned more electronics in school, this is super impressive work you are doing, congrats!
Thanks!!!

Originally Posted by Professor1701 View post
How is your metal detector design circuitry similar to or different from commercial designs?
Although the principle of operation of pulse metal detectors is the same, their designs are very diverse. I tried to make the metal detector as simple as possible (one gain stage on a conventional op amp, integrator and filter are implemented in software, on a not too powerful microcontroller with no outstanding ADC), but nonetheless possessing acceptable characteristics.

Originally Posted by Professor1701 View post
What commercial detectors are available in Russia?
My native language is russian, but i live in Belarus now. In our country, metal search is very limited at the legislative level.
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  #63  
Old 10-18-2019, 06:30 PM
Professor1701 Professor1701 is offline
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Sorry for saying Russia; I should have noticed Belarus as your location in the heading. I visited your webpage and am really impressed. I like how you used the lcd from a Nokia phone in your build too. That was one of my favorite cell phones years ago, and I only stopped using it because the cellular company made me upgrade. I guess if you cannot buy a metal detector, a smart educated person will build their own! What a great project to get younger people started in electronics and development too. I will be interested to see your updates as you keep tweaking your system and using it to search for treasure. Good luck!
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  #64  
Old 10-20-2019, 02:22 AM
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Thanks!!!

Good luck!
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  #65  
Old 11-01-2019, 11:26 PM
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Some finds in garden with FoxyPI
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  #66  
Old 11-02-2019, 03:29 AM
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Video illustration of metal detector starting procedures:
https://youtu.be/6YwlmcuxyKs
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  #67  
Old 11-11-2019, 08:25 AM
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The FoxyPI firmware version 3.5 is ready - FoxyPIv3_5.ino.eightanaloginputs.hex

What's new:
added the ability to adjust the display contrast using the CONTRAST item in the service menu

An example is small/normal/excessive contrast:
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  #68  
Old 01-21-2020, 02:38 AM
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Service menu strcuture in FoxyPI v3.5:
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  #69  
Old 02-07-2020, 05:13 AM
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I decided to numerically evaluate the stability of my metal detector - it turned out to be quite satisfactory: after 15 minutes of operation, the detection range of targets decreases by less than 4%.
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