Friendly Metal Detecting Forums   Quality Metal Detectors
List all sponsors

Go Back   Friendly Metal Detecting Forums > Detectors and Gear > Make It or Fix It Yourself

Reply
  
Thread Tools Display Modes
  #61  
Old 09-29-2019, 10:51 PM
Professor1701 Professor1701 is offline
New Member
 
Join Date: Sep 2019
Posts: 7
Default

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!
Reply With Quote


  #62  
Old 09-30-2019, 02:00 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

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.
Reply With Quote


  #63  
Old 10-18-2019, 05:30 PM
Professor1701 Professor1701 is offline
New Member
 
Join Date: Sep 2019
Posts: 7
Default

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!
Reply With Quote


1 members found this post helpful.
  #64  
Old 10-20-2019, 01:22 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Thanks!!!

Good luck!
Reply With Quote


  #65  
Old 11-01-2019, 10:26 PM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Some finds in garden with FoxyPI
Reply With Quote


  #66  
Old 11-02-2019, 02:29 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Video illustration of metal detector starting procedures:
https://youtu.be/6YwlmcuxyKs
Reply With Quote


  #67  
Old 11-11-2019, 07:25 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

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:
Reply With Quote


  #68  
Old 01-21-2020, 01:38 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Service menu strcuture in FoxyPI v3.5:
Reply With Quote


  #69  
Old 02-07-2020, 04:13 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

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%.
Reply With Quote


  #70  
Old 06-24-2020, 09:09 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Finds in our garden with FoxyPI (after electrolytic cleaning):
Reply With Quote


  #71  
Old 06-24-2020, 07:11 PM
shellhouse shellhouse is online now
Supporter
 
Join Date: Apr 2020
Location: GA, US
Posts: 158
Default

Great to see. Nice work!

Are detectors difficult to get in Belarus or is detecting itself not allowed in public areas? Looks like a very good solution either way.
Reply With Quote


1 members found this post helpful.
  #72  
Old 06-26-2020, 02:52 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Originally Posted by shellhouse View post
Great to see. Nice work!

Are detectors difficult to get in Belarus or is detecting itself not allowed in public areas? Looks like a very good solution either way.
Very thanks!!!

In our country, not only instrumental, but also visual search is completely forbidden for amateurs.
Reply With Quote


  #73  
Old 06-26-2020, 07:24 PM
shellhouse shellhouse is online now
Supporter
 
Join Date: Apr 2020
Location: GA, US
Posts: 158
Default

Originally Posted by FoxyLab View post
Very thanks!!!

In our country, not only instrumental, but also visual search is completely forbidden for amateurs.
That's really crazy!

__________________
Overequipped, underprepared.

Reply With Quote


  #74  
Old 06-29-2020, 03:05 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

FoxyPI with firmware 3.6 - golden ring test:
Reply With Quote


  #75  
Old 06-29-2020, 04:32 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

FoxyPI firmware v3.6:
FoxyPIv3_6.ino.eightanaloginputs.hex

What's new in version 3.6:

+ added the ability to configure the guard interval using the GUARD item of the service menu;
+ added auto-tuning of levels 1 and 2 of the audiovisual indication in static mode;
+ integrated test mode (to activate, after switching on, hold the control button until the graph of the signal curve appears)
Reply With Quote


  #76  
Old 06-30-2020, 08:38 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Service menu in firmware v3.6:
Reply With Quote


  #77  
Old 07-05-2020, 03:24 PM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

FoxyPI firmware v3.7:
FoxyPIv3_7.ino.eightanaloginputs.hex

What's new in version 3.7:

* small code optimization was performed to increase the stability of the metal detector
+ beep indication for errors ERR 01 and ERR 02 added
Reply With Quote


  #78  
Old 07-08-2020, 01:39 AM
FoxyLab's Avatar
FoxyLab FoxyLab is offline
Junior Member
 
Join Date: Dec 2015
Location: Belarus
Posts: 54
Default

Errors that may occur during zeroing:

ERR 01 - the saturation section was not found in the signal:
* coil break
* no pulse generation
* the signal during zeroing is so strong that the saturation region is shifted beyond the registration window

ERR 02:
* the signal during zeroing is strong enough so that the saturation region lasts until the end of the registration window
Reply With Quote


Reply


Thread Tools
Display Modes

Forum Jump


All times are GMT -4. The time now is 09:24 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.