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

[BC547]

I made this pinpointer but coil dident works i there is no sens

? Do you mean : I don't know how to make a coil ?
There is plenty of information to be found on this forum or in the "Coils" specific part.
Here is my 2 cts on coils for Pickini:

http://users.telenet.be/willaert/MD/pickini/pickini_en/V3/coil.html

And of course there is the excellent coil calculator by Qiaozhi:

https://www.geotech1.com/forums/showthread.php?17909-Coil-Calculator

If you just want to test the detector, you can hook up a simple bundle coil - diameter 20 cm / 26 turns.

And take it outside for testing.

[sbalio1]

Friend i ask if my pcb havent error
. And hex file whitch hex did you using. What about diameter of wire

[BC547]

PCB looks OK.
Check the DC values on the pins of the opamp and the PIC controller ( with coil connected ) as described here:

http://users.telenet.be/willaert/MD/pickini/pickini_en/V4/electronics.html

Hex file Pickini 4.1:

http://users.telenet.be/willaert/MD/pickini/software/v4/Pickini4.1.hex

[jeep6789]

What is the detection effect?

[BC547]

What is the detection effect?

When a target is under the coil, the pulse width increases.
The pulse width is measured with a high-resolution timer (32 MHz).

[jeep6789]

' Does the pulse width change more than the pulse amplitude

[jeep6789]

When detecting the pulse amplitude, we have a time-lapse sampling pulse as a reference, but when detecting the width, what do we use as a reference, should we also have a sampling pulse? How do you track this pulse that's changing in width

[BC547]

Does the pulse width change more than the pulse amplitude

If the pulse slope is exactly 45 degrees and depending on where you sample the voltage, ...no/yes.

When detecting the pulse amplitude, we have a time-lapse sampling pulse as a reference, but when detecting the width, what do we use as a reference, should we also have a sampling pulse? How do you track this pulse that's changing in width

The microcontroller keeps track of all samples in a slow running average value. Any samples that are different from this average = reference will trigger the target sound.
Slow changing ground influence is averaged out. This technique is also explained in the software examples in the book "Inside the metal detector"

[jeep6789]

Most importantly, I want to know its detection range, whether it can achieve the performance of general pulse detectors, such as Felezjoopi, and stability, whether it is suitable for large coils,

[BC547]

Here is an example of a larger coil mounted on a cart, to detect WW1 UXO at greater depth with Pickini.

https://www.geotech1.com/forums/showthread.php?23400-PICKINI-V4-an-easy-to-build-self-adjusting-PI-detector&p=258628#post258628

To answer your other questions, you will have to build all these detectors and find out what works best for your purposes.

[sbalio1]

hi i sve my problem it works well..ifound error pin 8 and 9 . unconsolidated

[BC547]

If you are looking for bigger objects at larger depths, consider building a simple fluxgate magnetometer
like this one:

https://www.geotech1.com/cgi-bin/pag...fmx1/index.dat

or a kit from:

https://www.fgsensors.com/

[BC547]

hi i sve my problem it works well..ifound error pin 8 and 9 . unconsolidated

Pin 8 and 9 of the PIC controller should be connected to each other.

[sbalio1]

yes its ok . this not working https://www.geotech1.com/cgi-bin/pag...fmx1/index.dat

[BC547]

PICKINI website moved

The web site for the PICKINI project has moved to

http://www.willaert.world/MD/pickini_en/V4/intro.html