PICKINI V4 - an easy to build, self adjusting PI detector

[BC547]

Nice video . Thanks for sharing it !
Even when no treasures are found, at least you get some exercise and fresh air.
These are also the typical finds here on the beach. Pickini v4 finds our iron euro-cent coins very attractive...
Well, you dug the trash and found some cash, what more can you expect in the park ?

Nice move with the pinpoint pushbutton an a very professional looking build

Best regards,
- Bernard

[morganton]

Short video of detecting with Pickini 4

I went to the park today with my Pickini 4 and spent a short time detecting and digging. My wife made a video of my first find:

https://youtu.be/OvFEMMV0HE4

Here is a photo of the loot I located in about 30 minutes:



Nothing very exciting in my finds but I'm very happy with how the detector works and the pinpoint feature is especially helpful.

I'm hoping to make it to a more exciting location in the near future.

[nick holas]

hi bernte
hi bernard
hi all
so simply that i didnt imagine that it can t be that
the wire was cut under the tape that i ve wounded around coil ,and the wire was cut in the middle of the coil so i can t view it!!!!!!!
when i tested it in one way that was good (0.6 ohms, aprox 400µH) and suddenly no continuity (don t know if thats the good word)
"et voila!!!!" finaly made one other coil and thats all good
thanks all

[bernte_one]

hi bernt
hi bernard
hi all
i ve made some test with my v4 (i ve changed transistor ,pic,irf and also some caps and finaly it s.................my coil!!!!!! grrrrrr
spend 3 day for this grrrrrrrrr coil!!!!
made one new and finaly works!!!!
...

please tell us the Details, what was wrong with your coil?

[BC547]

TP..: test points - have a look at post #343 in this thread.
Coil: http://users.telenet.be/willaert/MD/...n/V3/coil.html

+ the coil section of this forum of course. Any coil that works for eg surfPI should work with Pickini.

[biciuliux]

What diameter of coil wire? And, What is TP1, TP2, TP3?

[nick holas]

hi bernt
hi bernard
hi all
i ve made some test with my v4 (i ve changed transistor ,pic,irf and also some caps and finaly it s.................my coil!!!!!! grrrrrr
spend 3 day for this grrrrrrrrr coil!!!!
made one new and finaly works!!!!
now i m on my smd v4 ,it left some smd caps (thanks aliexpress (express ????) and lm318 smd and it ll be finish
im on too 2 analog metal detector thats looks promising and one PP (minimax)
have nice day

[bernte_one]

yes i know, i read all carefully
i would only say that Problems can be a result of wrong calibration or environmet influence

[BC547]

Hi Bernte_one,

I mentioned it here a couple of times already, but it is important to switch on the detector away from metal and EMI ( so, not indoors ).
Directly after power-on, there is a 20s calibration phase that will set the detection level wrong if it is disturbed continuously by interference.

[bernte_one]

hello, my V4 is working
tested with different coil shapes, unshielded
i tested indoor not far away from concrete floor, over 50% of sens pot it tends to get a bit nervous
and after detecting something it ends continous beeping, it also detects my Hand

so i will go outside and test there with unshielded coil, if the detector still detecs my Hand or mybe the ground i have to shield the coil

detection distance is very good for such a simple desing
for 2€ coin i get light over 30cm in air test with 35cm monoloop coil
with small 12cm coil i can detect a 0,4gr. Gold nuget in some cm distance in air
i also plan to use a pinpoint probe for testing

[BC547]

What can I change the transistor BC549B and PIC16F1824 microcontroller, because in Lithuania I can't find it?

BC549B: another NPN transistor?
PIC16F1824: no replacement.

[BC547]

so what the 10 k potentiometer do?

The sensitivity adjustment: min value = min sensitivity. Max value = max sensitivity.

[biciuliux]

What can I change the transistor BC549B and PIC16F1824 microcontroller, because in Lithuania I can't find it?

biciuliux

[mohammadreza1100]

Thanks.so what the 10 k potentiometer do?

[BC547]

Just switch it on with the coil kept away from metal
. It will calibrate itself.