Arduino metal detector?

[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]

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

[bernte_one]

nice work

[FoxyLab]

nice work

Thanks!

[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

[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

[FoxyLab]

FoxyPI with firmware 3.6 - golden ring test:

[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 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)

[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]

[FoxyLab]

Service menu in firmware v3.6:

[bernte_one]

hy marty look the hinds i marked you in the screenshot

i added a second pcb in the same file just switch the tab or worksheet in sprintlayout file

new.zip

[MartyJ1963]

@BernteOne,,,,,,Thanks! You taught me something I didn't knowhow to do. I will have a go now dong it with a proper ground plane,,Thanks again BerntOne. Regards, Marty

[bernte_one]

hy Marty i could do it, but i have no time these days, the school holdiay begins
so i can continue at midle of july

but i think it is a good training if you draw a bit wtih sprint layout
also remind to set a good practival hole diameter for the pins
ic sockets 2mm outer and 0,6 or 0,7 inner
for bigger ca 1000uF and more set 2,2mm / 1mm
1/4w - 0,6w resistor 1,8 /0,6mm
bigger resitors 2w (damping) 2/1mm
mosfet oval holes , etc...

if you have a wire bridge or sme tracks that cross another track just put it on copper top layer
same production costs at the end, no need for wire bridges

i am experienced in pcb ordering so if design is finished i can provide geotech user with pcb
1-3€ per unit plus shipping for example (alexey and marty without any charge)

my problem is just time besides my family