Voodoo Main Discussion

[ivconic]

I've had a lot of fun with GCB, got me writing PIC code which works, hate avr's

Pics are just so much easier to work with, once you have a hex file, just open ONE factory supplied piece of sotware, plug in the pickit, plug in the chip and burn the hex. done .

With avr's there is not just one piece of software that works with attiny 12 and up, you gotta mess around working out fuses.
You have to find multiple software that will burn the avr you want, then find a burner ICSP schematic that works and drivers, or fart around with arduino as an ISP which does not support all avr chips, just a nightmare

Ha,ha,ha!
It depends on what have you being used from a start.
AVRs are just so friendly and cute to work with them.
Very easy and simple actually.
Just as with PIC's too i presume.
If you are used on those and having all the needed tools.
You don't need to mess with fuses if you don't like.
Even if you need; it is easy actually.

[lamoiz]

Hi everyone. I made 3 rx coils for the omega. 1: 0.10mm, 2: 0.20, 3: 0.25mm all three have almost the same inductance value, only their resistance changes of course, .. for the moment, it is 0.25 mm which is the most sensitive to the target size. all resonate at 9.9, 10, and 10.2khz. Tomorrow I change the capacity, to resonate at other frequencies ..

[surfdetector]

Hi everyone. I made 3 rx coils for the omega. 1: 0.10mm, 2: 0.20, 3: 0.25mm all three have almost the same inductance value, only their resistance changes of course, .. for the moment, it is 0.25 mm which is the most sensitive to the target size. all resonate at 9.9, 10, and 10.2khz. Tomorrow I change the capacity, to resonate at other frequencies ..

Hi Lamoiz, How much more sensitive is the 0.25mm compared to the others?

[6666]

Ha,ha,ha!
It depends on what have you being used from a start.
AVRs are just so friendly and cute to work with them.
Very easy and simple actually.
Just as with PIC's too i presume.
If you are used on those and having all the needed tools.
You don't need to mess with fuses if you don't like.
Even if you need; it is easy actually.

I just find avrs so under supported and frustrating, what single piece of software and what burner would you use to burn avr's starting at atiny12,13,15 etc, up to mega8 and 328p ? thanks

[6666]

Hi everyone. I made 3 rx coils for the omega. 1: 0.10mm, 2: 0.20, 3: 0.25mm all three have almost the same inductance value, only their resistance changes of course, .. for the moment, it is 0.25 mm which is the most sensitive to the target size. all resonate at 9.9, 10, and 10.2khz. Tomorrow I change the capacity, to resonate at other frequencies ..

Good experiment, I was wondering about the same thing with wire size etc, please keep us informed.

[ivconic]

I just find avrs so under supported and frustrating, what single piece of software and what burner would you use to burn avr's starting at atiny12,13,15 etc, up to mega8 and 328p ? thanks

I have many more tools.
Probably several G-bytes of various software tools for AVRs.
I have all known Arduino development systems and boards (boxes and boxes fed up and piled up).
I have USBasp dongle ISP programmer. Also have AVRISP MKII programmer to, PDI option too.
Also i made several "bare bone" programmers.
Also i made "fuse doctor" board. Works like charm. Resets and puts all the fuses to default values at almost all known AVRs.
Usually i do know how to set the fuses in details. But sometimes i like to experiment with protection and not so rare case that i make mess with fuses and simply "brick" the mcu.
Than i pull up "fuse doctor" and "heal" the bricked one in a second.
AVRISP MKII usually i use for HV programming. I use Atmel Studio (usually latest version) to update firmware at MKII.
Later i can use AVRISP MKII with Atmel Studio drivers or also as well as with LIBUSB drivers for use with third party software.
And over the top; Arduino UNO R3 can be configured and wired up to serve as programmer for all AVR's you can imagine.
Most of the time i use Arduino IDE for Atmegas and Attinys.
For STM32xxxxx ARMs i use AVRISP MKII with Flip or some third party software, depends, from case to case.
Although lately i arranged setup to program STMs directly via Arduino IDE.
Lately i obtain Attiny85 with USB on it, small dongle. It's all in bootloader.
Etc.
AVRs are so easy, fun and joy to work with them.
There is great massive open source community where you can find answer on any possible qestion.
Also there are "zillion" of ready libraries from almost everything to work with Atmels.
Programming was never easier.
You can do it both ways; "regularly" through the Studios and through the third party tools.

[MartinB]

hi, first of all, i am in testing phase. on the omega and also on a super D.
for the omega, the tx is 300mm and the nulling 110mm. it is made of litz175 / 46 wire. its inductance is 440uh. there are 26 turns.The rx coil is 0.2mm enameled copper. it is tuned with a capacity of 22nf. the dimensions are 140mm-170mm it is oval. there are 166 laps.(10.5mh) the resonance is 10.2 khz. the nulling obtained is 12mv .. for the moment, since nothing is really fixed. the sensitivity is average, a piece of copper is captured at 22cm, which is average given the dimensions, (in hybrid mode on the voodoo). the test on gold and platinum is average too, no more than 15 cm ... but this is only the beginning, because I have not adjusted anything in the parameters of the voodoo. here is.

Hi Lamoiz
Where did you buy your litz wire from? The only place I can find this size is USA.
Thanks

[lamoiz]

Hi Lamoiz
Where did you buy your litz wire from? The only place I can find this size is USA.
Thanks

https://www.ebay.fr/itm/50m-165-Litz...cAAOSwuHJbC-5- hong kong...
hi, i bought in this shop .. see if there is any 175/46 .

[lamoiz]

Hi Lamoiz, How much more sensitive is the 0.25mm compared to the others?

hi surf, with the same settings and the same target, the 0.25 mm detected with a few cm more .. about 2 or 3 cm maximum, the worst is the 0.10mm.

[lamoiz]

this evening I made tests at different frequencies, here is a summary of the results on a Napoleon bronze coin. the best is around 10khz. I tested on the omega; rx a 5, 7.7; 10, 15.5, 22 khz,. for gold, I have not tested. I asked a friend in MP to do the test on the f75. I will now do the same tests on the Super D this weekend.

[Matt_Rowe]

this evening I made tests at different frequencies, here is a summary of the results on a Napoleon bronze coin. the best is around 10khz. I tested on the omega; rx a 5, 7.7; 10, 15.5, 22 khz,. for gold, I have not tested. I asked a friend in MP to do the test on the f75. I will now do the same tests on the Super D this weekend.

most of the vlfs i have owned will not find small gold unless over 13khz, my tesoro right now is at 25khz, and i had a whites GM that was at 50khz, the whites could pick up sub gram at 2-3 inches in the Az soil here with black sands. That is with a 6x9 oval DD, dont know if this info helps or not, when voodoo in vlf mode does it go by khz, or is it a generic PI mode or actual vlf mode.

[6666]

hi surf, with the same settings and the same target, the 0.25 mm detected with a few cm more .. about 2 or 3 cm maximum, the worst is the 0.10mm.

Thanks

[lamoiz]

most of the vlfs i have owned will not find small gold unless over 13khz, my tesoro right now is at 25khz, and i had a whites GM that was at 50khz, the whites could pick up sub gram at 2-3 inches in the Az soil here with black sands. That is with a 6x9 oval DD, dont know if this info helps or not, when voodoo in vlf mode does it go by khz, or is it a generic PI mode or actual vlf mode.

it seems to me that the idea, the concept of voodoo, is to TRUE discrimination on a PI, and I think George did a great job, many thanks to this great man.

[6666]

[ATTACH]53952[/ATTACH]

I have many more tools.
Probably several G-bytes of various software tools for AVRs.
I have all known Arduino development systems and boards (boxes and boxes fed up and piled up).
I have USBasp dongle ISP programmer. Also have AVRISP MKII programmer to, PDI option too.
Also i made several "bare bone" programmers.
Also i made "fuse doctor" board. Works like charm. Resets and puts all the fuses to default values at almost all known AVRs.
Usually i do know how to set the fuses in details. But sometimes i like to experiment with protection and not so rare case that i make mess with fuses and simply "brick" the mcu.
Than i pull up "fuse doctor" and "heal" the bricked one in a second.
AVRISP MKII usually i use for HV programming. I use Atmel Studio (usually latest version) to update firmware at MKII.
Later i can use AVRISP MKII with Atmel Studio drivers or also as well as with LIBUSB drivers for use with third party software.
And over the top; Arduino UNO R3 can be configured and wired up to serve as programmer for all AVR's you can imagine.
Most of the time i use Arduino IDE for Atmegas and Attinys.
For STM32xxxxx ARMs i use AVRISP MKII with Flip or some third party software, depends, from case to case.
Although lately i arranged setup to program STMs directly via Arduino IDE.
Lately i obtain Attiny85 with USB on it, small dongle. It's all in bootloader.
Etc.
AVRs are so easy, fun and joy to work with them.
There is great massive open source community where you can find answer on any possible qestion.
Also there are "zillion" of ready libraries from almost everything to work with Atmels.
Programming was never easier.
You can do it both ways; "regularly" through the Studios and through the third party tools.

Thanks reply, do you have your Arduino UNO R3 set up so it can program attiny 12-13-15 ? if I could do that I would be happier.

[Qiaozhi]

most of the vlfs i have owned will not find small gold unless over 13khz, my tesoro right now is at 25khz, and i had a whites GM that was at 50khz, the whites could pick up sub gram at 2-3 inches in the Az soil here with black sands. That is with a 6x9 oval DD, dont know if this info helps or not, when voodoo in vlf mode does it go by khz, or is it a generic PI mode or actual vlf mode.

Have you not read the book?