BRN Pi-1 DİJİTAL Pİ

[DEMAC]

brn hex

here are two last versions. I dont know the difference

best regards

[Micheal]

brn-1 son 876.zip if you are using PIC 16F876
brn-1 son 876a.zip if you are using PIC 16F876A

Thank you DEMAC for putting the hex files here

You can use either one of the above PIC


I downloaded the Hex file onto the PIC using a pic programmer and it was very straight forward ...However I didnt write the program and I have no idea how to do so ...It was written by Baron who also designed the the detector and well done to him I say what a clever chap...As you know by now my knowledge is very limited but I really like it and I think with some tinkering help from you guys on the forum it could be a more powerful machine.
As far as coils go there have been poeple on that website that have tried many different coil parameters and different things without to much luck...I have asked him to add a timing function adjustment function and a vco because the 16f876 pic has an inbuillt tone generator to the hex and PCB but when and if it happens it will be great.Aparently there is a hex with dicrimination but that is available in the kit which has to be paid for which is understandable.
Baron says that modifications can be done on the board side of things rather than the hex file and the hex file has nothing to do with the capabilities that can be had ...and sorry I dont think the hex can be modified and he doesnt want the hex touched in any way and we must respect his work ...but he has provided a very nice platform open to development to work with and the only thing left to do now is more tinkering

[Rov]

Michael,from your first posts on the subject you mention you have two coils tested with,one a 18cm,another a 32cm.how many turns of windings you use to make these?
For your simple Pic programming,what Softwares u use for this? ICprog,or WinPic,or MPlab?for the Hex. Thanks! Rov

[WM6]

For your simple Pic programming,what Softwares u use for this? ICprog,or WinPic,or MPlab?for the Hex. Thanks! Rov

Used by author (PIC PRog in attachment):

[WM6]

Michael,from your first posts on the subject you mention you have two coils tested with,one a 18cm,another a 32cm.how many turns of windings you use to make these?

Device can be tested by "standard" PI coil wich suit most PI detectors: Coil Diameter 190mm, Wire Diameter about 0.7mm, Number of Turns 27, shielded or non shielded. Try some coil "tunning" by R4 wich can vary from 600 to 1100E (use scope to get most linear and quickiest fall of induced U in coil without after fall oscillations)

Last published schematic (maybe Michael explain turkish text on schematic and draving):

[Rov]

Very nice comprehensive infomation WM6,much appreciate.
Now to find a blank pcb an etch a board.I have all the Parts on hand already,an plenty of Mono Pi coils ,from 4inch thru to 14 inch.
Something to do over this coming weekend break.
Regards Rov

[johnandles]

PCB changes

Hello Micheal,
Thankyou for your post.
The schematic at post 4 shows a link.(in green),
If we look at the pdf 1.1 pcb the link has been incorporated,and not necessary. also additional header for off board switches has been added.
Just an observation.
I wonder what the hex is optimized for ..(gold ?)
It would be good to alter timings.
Cheers
John
Hello to Rov

[Micheal]

Hi guys ...with the coil Dont go over 3ohms ...i have made them in all different sizes and shapes for this thing it works with my old garret xl 500 coil which is 1.2 ohms ....very simple no fussy details needed here.....

and make sure the green link is added on the pcb before you add power..

The hex is from memory is not optimised for gold and apparently from memory the minimum it will go to is 20us and that is due to the pic and must be incorporated in the Hex which I am still waiting(hoping) for from Sir Baron.
I have requested from Baron to add a feature so that the timing can be adjusted ...Im sure that would add some extra sensitivity

[Rov]

Hi Michael,U waiting for the new hex for gold optimisation on the pic??or a new pic with the new hex Locked for gold optimisation? from Baron.
Some timing parrameter will be adjustable via your onboard switches,what else are they for,then?You have them in your Pictures an illustrations,how do you adjust these.?
Send me a Pm if the info needs clarification an off the forum for the moment.Your in Oz I take it?
Cheers! Rov

[WM6]

Some timing parrameter will be adjustable via your onboard switches,what else are they for,then?

Regret, not for timing, regarding my Turkish translations, by switches we can control only sensitivity (+/-), volume (+/-) and ground adjustments (the last maybe related to timing but in not known frame).

[Rov]

Ok,Thanks for your Interpretation of onboard switches then WM6.for this PI unit.
Pity then no adjustments then for anything for Pulse,Width,or delays,etc.via these switches? to control Micro.
Softwares,code on the Pic only it seems? Ok.
Regards Rov.

[Micheal]

sw1 is the switch for the LCD light....TPR is ground balance button...S- an S+ are volume plus and minus buttons ...the H- and H+ buttons are the sensitivity plus and minus buttons....and the 100 k trim pot on the main is for the sensitivity adjustment.

the timing is adjustable through the hex I believe...

[mikebg]

Is this real? The sample delay in microseconds?

[WM6]

Is this real? The sample delay in microseconds?

As said in Patent - microseconds:

[mikebg]

At step down response, can be obtained point, where the curve I (IRON) of the target signal crosses the curve N (NO TARGET). This means change of polarity in the time domain. In the frequency domain, the change of polarity transforms in change the sign of phase difference. The point of change has phase difference zero and represents resonance frequency. Only material which possesses both conductivity and ferromagnetizm may have resonance frequency. In practice this can be: mineralized wet soil or iron object.
Actually this is quasiresonance because the phase difference is zero apparently only, but actually at that frequency the iron signal has phase lag -360 deg. This is invisible in the frequency domain, but is a long delay in the time domain. In this figure there is depiction of an error in the zero curve N. It must pass at the left of all other lines to obtain an iron quasiresonance for a delay of more than 40 us. There would be no quasiresonance with other metals, which corresponds to reality.
Here's how it should look the correct figure.