Arduino metal detector?

[FoxyLab]

Service menu in firmware v3.6:

[FoxyLab]

[MartyJ1963]

@BerntOne,,,Thanks,,I'll take a look later. @Foxy,,,,Thanks for all the work and build details/info/files etc,,it's great of you to share. Thanks, regards, Marty.

[FoxyLab]

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)

[bernte_one]

@ marty
just check the buy sell thread, the linked pdf document from my google drive contains the stuff i sell
also i have most of actual project pcb at home

just ask for it

i look your design files this evening after work

@foxy
thanks for sharing

[FoxyLab]

FoxyPI with firmware 3.6 - golden ring test:

[MartyJ1963]

@BerntOne,,,,Can you check this for me please? If it is all correct I can start to tidy up a little then. I've enclosed the Scanned copy I used to use it as reference, Thanks, Marty

[MartyJ1963]

@BerntOne,,,,,I will re-draw it in Sprint Layout so it has has the BOM list if you want? I have plenty of time free,,, Can you check the drawing for me when I have finished please? Also, do you have a new revised list of the PCB's you were selling earlier this year please as I may be interested in a new project to build? It was a kind thought by you to donate the money from your surplus projects to your local school and Martial arts club for training equipment,,I have been a teacher of Wing Chun Gung Fu since since 1984 and I remember how hard it was to find the money for for training apparatus back then. I'll draw the 'Foxy' later today, Regards, Marty

[FoxyLab]

nice work

Thanks!

[bernte_one]

nice work

[FoxyLab]

The version 3.6 is almost ready

What's new in 3.6:
+ test mode integrated in work version
+ guard interval setting in menu added
+ lvl 1 & 2 autosetting added

[FoxyLab]

I replaced the LM358N with the LM358P and (although they should be identical) the behavior of the metal detector has noticeably changed - the recorded decay of the signal has become much sharper, the sensitivity to small objects has increased, and the sensitivity to the Earth’s magnetic field has disappeared (you can wave the coil without worrying about its horizontalness) .
P.S. I also switched to using three lithium-ion batteries instead of ten batteries.

[FoxyLab]

N1 - old railroad nail (старий залізничний костиль)

There, many objects are of interest to me - a forged handle (5), a strange forged cone with a thread on the base (9), a circle segment (14), the remains of a knife (?) (6,7), an element of an agricultural implement (?) (2) , a massive piece ( 18 ) , similar to a fragment of a shell / mine / bomb, but with artificial recesses inside ...

[bernte_one]

Hi Marty, better you import the PCB layout as picture in the backgraund from SprintLayout and then redraw all parts, copper tracks and GND plane
result is better than gerber import, also you get a clean BOM List im you fit every part with clean part number and value

i would do it this way but have no time the next days

[Vadim18]

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

N1 - old railroad nail (старий залізничний костиль)